DE102013214464A1 - Method for producing a chromium-containing alloy and chromium-containing alloy - Google Patents

Abstract

The invention relates to a process for the production of a chromium-containing alloy in which elemental chromium with an average purity of at least 99.5% is used in the production. The invention further relates to a chromium-containing alloy, in particular for producing a component for a thermal gas turbine, this being obtainable or obtained by a production process in which elemental chromium with an average purity of at least 99.5% is used. Finally, the invention relates to a method for examining an alloy.

Description

The invention relates to a method for producing a chromium-containing alloy. Furthermore, the invention relates to a chromium-containing alloy, a component made from such a chromium-containing alloy and a method for examining an alloy.

The chemical composition of alloys is specified in factory standards for each alloy. In the company standard or specification in addition to the mass fractions of the alloying elements and the maximum permissible mass fractions of impurities such. As silicon, phosphorus, sulfur, etc. set. In particular, the strength properties of chromium-containing alloys, which can be used as turbine materials, for example, but despite these specifications strongly scatter, especially in terms of their dynamic strength. According to the current state of the art it is assumed that cracks on hard phases, eg. As to carbides, or weak points, z. B. pores, arise within a made of the alloy in question component. There has been no lack of attempts to narrow the scattering bands of chromium-containing alloys by changing the chemical composition or by modifying the post-treatment steps, for example the heat treatment and forging parameters. However, a significant improvement has not yet been achieved.

The object of the present invention is to provide a method for producing a chromium-containing alloy having improved strength properties. Further objects of the invention are to provide a chromium-containing alloy with improved strength properties and a component made from such an improved alloy. Another object of the invention is to provide a method by means of which the causes for a reduced strength property of an alloy can be investigated.

The objects are achieved by a method with the features of claim 1, by a chromium-containing alloy having the features of claim 4, by a component having the features of claim 9 and by a method according to claim 10 for examining an alloy. Advantageous embodiments with expedient developments of the invention are specified in the respective subclaims.

A first aspect of the invention relates to a method for producing a chromium-containing alloy, wherein improved strength properties of the alloy are achieved according to the invention by using elemental chromium having a mean purity of at least 99.5% in the production of the alloy. The invention is based on the recognition that chromium is that alloying element which, even if it is present only in low mass fractions in the alloy, substantially contributes to the formation of crack-initiating phases within the alloy. To produce chromium-containing alloy, the individual alloying elements are usually mixed and melted into an alloy, it also being possible in principle for one or more master alloys to be used. The chromium portion of these alloys is produced in the prior art by the addition of technical chromium, that is by the addition of chromium with a purity of 99.0% (purity 2N). Technical grade 2N chromium is typically obtained aluminothermically, while higher purity chromium is typically produced electrolytically. The increase of the average degree of purity of the chromium used in the context of the invention to at least 99.5% (degree of purity at least 2N5) results in a significant reduction of segregations, inclusions, pores and other imperfections even at a low chromium content in the alloy the number of fisselfünstigender range is significantly reduced within a manufactured from such an alloy component. An alloy produced by means of the method according to the invention therefore has much narrower spreading bands with regard to their strength properties and therefore makes it possible to fully exploit their potential. Under a purity level of at least 99.5%, purities of 99.50%, 99.51%, 99.52%, 99.53%, 99.54%, 99.55%, 99, 99 are particularly useful in the context of the present invention. 56%, 99.57%, 99.58%, 99.59%, 99.60%, 99.61%, 99.62%, 99.63%, 99.64%, 99.65%, 99, 66%, 99.67%, 99.68%, 99.69%, 99.70%, 99.71%, 99.72%, 99.73%, 99.74%, 99.75%, 99, 76%, 99.77%, 99.78%, 99.79%, 99.80%, 99.81%, 99.82%, 99.83%, 99.84%, 99.85%, 99, 86%, 99.87%, 99.88%, 99.89%, 99.90%, 99.91%, 99.92%, 99.93%, 99.94%, 99.95%, 99, 96%, 99.97%, 99.98%, 99.99%, 99.991%, 99.992%, 99.93%, 99.994%, 99.995%, 99.996%, 99.997%, 99.998% or higher, and purities of 2N5, 3N , 3N5, 4N, 5N, 6N, 7N, 8N or higher. Other commonly used terms for chromium with a minimum purity of 99.5% are "for synthesis", "pure", "purest", "for analysis" and "high purity", these terms being used in part by the manufacturer, so that the actual Purity can vary.

In an advantageous embodiment of the invention, the chromium is used in the form of powder and / or in the form of flakes and / or in the form of ingots and / or in the form of ingots and / or granules for producing the chromium-containing alloy. This allows a particularly flexible production of the alloy with respect to its chromium content. In particular, the use of chromium flakes and chrome granules offers the particular advantage that too low a degree of purity can often already be detected with the naked eye on the basis of small dark inclusions. Thus, it can be ruled out particularly reliably that disadvantageous impurities enter the alloy via the chromium component.

In a further advantageous embodiment of the invention, the chromium-containing alloy is produced using a master alloy. It can be provided in principle that the master alloy is chromium-free, so that the chromium portion of the alloy is introduced without the aid of a master alloy in the alloy. Alternatively, a proportion of the chromium portion or the entire chromium content can be introduced into the alloy via the master alloy. Since, in particular in the latter case, the proportion of chromium in the master alloy is necessarily higher than in the final alloy, the use of chromium with a purity of at least 99.5% is particularly advantageous, since thus the undesirable formation of segregations, imperfections, inclusions and the like particularly high degree is prevented.

A second aspect of the invention relates to a chromium-containing alloy, which is particularly suitable for producing a component for a thermal gas turbine. Improved strength properties of the alloy are achieved according to the invention by the fact that the alloy is obtainable or obtained by a production process in which elemental chromium with an average purity of at least 99.5% is used. Further features and their advantages can be found in the descriptions of the first aspect of the invention, wherein advantageous embodiments of the first aspect of the invention are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa.

In an advantageous embodiment of the invention, the chromium-containing alloy is formed as a nickel-based alloy and has the following composition in percent by mass:
1.00 to 24.00% by weight Cr
0 to 19.50 wt.% Fe
0 to 7.00% by weight Al
0 to 26.00 wt.% Mo
0 to 21.00 wt.% Co
0 to 5.20% by weight of Ti
0 to 14.20 wt.% W
0 to 8.90 wt.% Ta
0 to 5.60 wt.% Nb
0 to 0.025 wt.% B
0 to 3.10% by weight Re
0 to 1.60 wt.% Mn
0 to 0.50 wt.% Cu
0 to 3.3% by weight C
0 to 1.00% by weight V
0 to 1.60 wt.% Hf
0 to 1.20 wt.% Si
0 to 0.50% by weight of other elements in total, of which each other element is not more than 0.20% by weight
Balance Ni, but at least 30% by weight.

In the context of the invention, a proportion of chromium between 1.00 and 24.00% by weight means in particular mass fractions of 1.00% by weight, 1.50% by weight, 2.00% by weight, 2.50% by weight .%, 3.00 wt.%, 3.50 wt.%, 4.00 wt.%, 4.50 wt.%, 5.00 wt.%, 5.50 wt.%, 6.00 wt. %, 6.50 wt%, 7.00 wt%, 7.50 wt%, 8.00 wt%, 8.50 wt%, 9.00 wt%, 9.50 wt% , 10.00% by weight, 10.50% by weight, 11.00% by weight, 11.50% by weight, 12.00% by weight, 12.50% by weight, 13.00% by weight, 13.50 wt.%, 14.00 wt.%, 14.50 wt.%, 15.00 wt.%, 15.50 wt.%, 16.00 wt.%, 16.50 wt.%, 17 , 00 wt.%, 17.50 wt.%, 18.00 wt.%, 18.50 wt.%, 19.00 wt.%, 19.50 wt.%, 20 wt.%, 20.50 wt %, 21.00% by weight, 21.50% by weight, 22.00% by weight, 22.50% by weight, 23.00% by weight, 23.50% by weight and 24.00% by weight. % and corresponding intermediate values such as 10.00% by weight, 10.10% by weight, 10.20% by weight, 10.30% by weight, 10.40% by weight, 10.50% by weight, 10, 60% by weight, 10.70% by weight, 10.80% by weight, 10.90% by weight, 11.00% by weight, etc., to be understood. In the context of the present invention, smaller intermediate values, such as, for example, 11.00% by weight, 11.01% by weight, 11.02% by weight, 11.03% by weight, 11.04, are also suitable for this and for all other ranges Wt%, 11.05 wt%, 11.06 wt%, 11.07 wt%, 11.08 wt%, 11.09 wt%, 11.10 wt%, 11.000 wt% , 11.001% by weight, 11.002 % By weight, 11.003% by weight, 11.004% by weight, 11.005% by weight, 11.006% by weight, 11.007% by weight, 11.008% by weight, 11.009% by weight, 11.010% by weight, etc., as indicated by the respective range indication to be co-disclosed. Accordingly, an iron content of between 0 and 19.50% by weight means, for example, mass fractions of 0% by weight, 0.50% by weight, 1.00% by weight, 1.50% by weight, 2.00% by weight. %, 2.50 wt%, 3.00 wt%, 3.50 wt%, 4.00 wt%, 4.50 wt%, 5.00 wt%, 5.50 wt% , 6.00% by weight, 6.50% by weight, 7.00% by weight, 7.50% by weight, 8.00% by weight, 8.50% by weight, 9.00% by weight, 9.50 wt.%, 10.00 wt.%, 10.50 wt.%, 11.00 wt.%, 11.50 wt.%, 12.00 wt.%, 12.50 wt.%, 13 , 00 wt%, 13.50 wt%, 14.00 wt%, 14.50 wt%, 15.00 wt%, 15.50 wt%, 16.00 wt%, 16, 50% by weight, 17.00% by weight, 17.50% by weight, 18.00% by weight, 18.50% by weight, 19.00% by weight and 19.50% by weight and corresponding intermediate values such as for example 2.0% by weight, 2.1% by weight, 2.2% by weight, 2.3% by weight, 2.4% by weight, 2.5% by weight, 2.6% by weight, 2.7% by weight, 2.8% by weight, 2.9% by weight, 3.0% by weight, etc., to be understood. A mass fraction of 0% by weight in the context of the present invention basically means that the relevant element is not present or in amounts below the detection limit in the alloy. An aluminum content of between 0 and 7.00% by weight includes, for example, mass fractions of 0.0% by weight, 0.5% by weight, 1.0% by weight, 1.5% by weight, 2.0% by weight .%, 2.5 wt.%, 3.0 wt.%, 3.5 wt.%, 4.0 wt.%, 4.5 wt.%, 5.0 wt.%, 5.5 wt. %, 6.0% by weight, 6.5% by weight, 7.0% by weight and corresponding intermediate values such as, for example, 5.0% by weight, 5.1% by weight, 5.2% by weight, 5, 3 wt.%, 5.4 wt.%, 5.5 wt.%, 5.6 wt.%, 5.7 wt.%, 5.8 wt.%, 5.9 wt.%, 6.0 % By weight and so on. A molybdenum content of between 0 and 26.00 wt.% Includes, for example, mass fractions of 0 wt.%, 0.50 wt.%, 1.00 wt.%, 1.50 wt.%, 2.00 wt.%. , 2.50 wt.%, 3.00 wt.%, 3.50 wt.%, 4.00 wt.%, 4.50 wt.%, 5.00 wt.%, 5.50 wt.%, 6.00 wt%, 6.50 wt%, 7.00 wt%, 7.50 wt%, 8.00 wt%, 8.50 wt%, 9.00 wt%, 9 , 50% by weight, 10.00% by weight, 10.50% by weight, 11.00% by weight, 11.50% by weight, 12.00% by weight, 12.50% by weight, 13, 00 wt%, 13.50 wt%, 14.00 wt%, 14.50 wt%, 15.00 wt%, 15.50 wt%, 16.00 wt%, 16.50 % By weight, 17.00% by weight, 17.50% by weight, 18.00% by weight, 18.50% by weight, 19.00% by weight, 19.50% by weight, 20% by weight , 20.50% by weight, 21.00% by weight, 21.50% by weight, 22.00% by weight, 22.50% by weight, 23.00% by weight, 23.50% by weight, 24.00% by weight, 24.50% by weight, 25.00% by weight, 25.50% by weight and 26.00% by weight and corresponding intermediate values such as, for example, 12.00% by weight, 12.10% by weight .%, 12.20 wt.%, 12.30 wt.%, 12.40 wt.%, 12.50 wt.%, 12.60 wt.%, 12.70 wt.%, 12.80 wt. %, 12.90% by weight, 13.00% by weight and so on. A cobalt content of between 0 and 21.00 wt.% Includes, for example, mass fractions of 0 wt.%, 0.50 wt.%, 1.00 wt.%, 1.50 wt.%, 2.00 wt. , 2.50 wt.%, 3.00 wt.%, 3.50 wt.%, 4.00 wt.%, 4.50 wt.%, 5.00 wt.%, 5.50 wt.%, 6.00 wt%, 6.50 wt%, 7.00 wt%, 7.50 wt%, 8.00 wt%, 8.50 wt%, 9.00 wt%, 9 , 50% by weight, 10.00% by weight, 10.50% by weight, 11.00% by weight, 11.50% by weight, 12.00% by weight, 12.50% by weight, 13, 00 wt%, 13.50 wt%, 14.00 wt%, 14.50 wt%, 15.00 wt%, 15.50 wt%, 16.00 wt%, 16.50 % By weight, 17.00% by weight, 17.50% by weight, 18.00% by weight, 18.50% by weight, 19.00% by weight, 19.50% by weight, 20% by weight , 20.50% by weight and 21.00% by weight and corresponding intermediate values such as 10.00% by weight, 10.10% by weight, 10.20% by weight, 10.30% by weight, 10.40 % By weight, 10.50% by weight, 10.60% by weight, 10.70% by weight, 10.80% by weight, 10.90% by weight, 11.00% by weight, etc., to be understood. For example, a titanium content of between 0 and 5.20 wt.% Includes mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt. %, 1.70 wt%, 1.80 wt%, 1.90 wt%, 2.00 wt%, 2.10 wt%, 2.20 wt%, 2.30 wt% , 2.40 wt.%, 2.50 wt.%, 2.60 wt.%, 2.70 wt.%, 2.80 wt.%, 2.90 wt.%, 3.00 wt.%, 3.10 wt.%, 3.20 wt.%, 3.30 wt.%, 3.40 wt.%, 3.50 wt.%, 3.60 wt.%, 3.70 wt.%, 3 , 80% by weight, 3.90% by weight, 4.00% by weight, 4.10% by weight, 4.20% by weight, 4.30% by weight, 4.40% by weight, 4, 50% by weight, 4.60% by weight, 4.70% by weight, 4.80% by weight, 4.90% by weight, 5.00% by weight, 5.10% by weight and 5.20 % By weight and corresponding intermediate values such as, for example, 3.50% by weight, 3.51% by weight, 3.52% by weight, 3.53% by weight, 3.54% by weight, 3.55% by weight, 3.56 wt.%, 3.57 wt.%, 3.58 wt.%, 3.59 wt.%, 3.60 wt.%, Etc., to be understood. By way of example, a proportion by weight of tungsten between 0 and 14.20% by weight means mass fractions of 0% by weight, 0.50% by weight, 1.00% by weight, 1.50% by weight, 2.00% by weight. , 2.50 wt.%, 3.00 wt.%, 3.50 wt.%, 4.00 wt.%, 4.50 wt.%, 5.00 wt.%, 5.50 wt.%, 6.00 wt%, 6.50 wt%, 7.00 wt%, 7.50 wt%, 8.00 wt%, 8.50 wt%, 9.00 wt%, 9 , 50% by weight, 10.00% by weight, 10.50% by weight, 11.00% by weight, 11.50% by weight, 12.00% by weight, 12.50% by weight, 13, 00% by weight, 13.50% by weight, 14.00% by weight and 14.20% by weight and corresponding intermediate values such as 10.00% by weight, 10.10% by weight, 10.20% by weight , 10.30 wt.%, 10.60 wt.%, 10.70 wt.%, 10.80 wt.%, 10.90 wt.%, 10.30 wt.%, 10.40 wt.%, 10.50 wt. 11.00 wt.%, Etc. to understand. For example, a tantalum content of between 0 and 8.90 wt.% Includes mass fractions of 0 wt.%, 0.50 wt.%, 1.00 wt.%, 1.50 wt.%, 2.00 wt.%. , 2.50 wt.%, 3.00 wt.%, 3.50 wt.%, 4.00 wt.%, 4.50 wt.%, 5.00 wt.%, 5.50 wt.%, 6.00% by weight, 6.50% by weight, 7.00% by weight, 7.50% by weight, 8.00% by weight, 8.50% by weight and 8.90% by weight, and the like Intermediate values such as 8.00 wt.%, 8.01 wt.%, 8.02 wt.%, 8.03 wt.%, 8.04 wt.%, 8.05 wt.%, 8.06 wt. %, 8.07% by weight, 8.08% by weight, 8.09% by weight, 8.10% by weight, etc., to be understood. Examples of niobium contents of 0 and 5.60% by weight are mass fractions of 0% by weight, 0.10% by weight, 0.20% by weight, 0.30% by weight, 0.40% by weight. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60 wt%, 2.70 wt%, 2.80 wt%, 2.90 wt%, 3.00 wt%, 3.10 wt%, 3.20 wt%, 3.30 % By weight, 3.40 wt.%, 3.50 wt.%, 3.60 wt.%, 3.70 wt.%, 3.80 wt.%, 3.90 wt.%, 4.00 wt .%, 4.10 wt.%, 4.20 wt.%, 4.30 wt.%, 4.40 wt.%, 4.50 wt.%, 4.60 wt.%, 4.70 wt. %, 4.80 wt%, 4.90 wt%, 5.00 wt%, 5.10 wt%, 5.20 wt%, 5.30 wt%, 5.40 wt% , 5.50 wt.%, 5.60 wt.% And corresponding intermediate values. A proportion of boron of between 0 and 0.025% by weight means, for example, percentages by weight of 0% by weight, 0.001% by weight, 0.002% by weight, 0.003% by weight, 0.004% by weight, 0.005% by weight, 0.006% by weight. , 0.007 wt%, 0.008 wt%, 0.009 wt%, 0.010 wt%, 0.011 wt%, 0.012 wt%, 0.013 wt%, 0.014 wt%, 0.015 wt%, 0.016 wt% , 0.017 wt.%, 0.018 wt.%, 0.019 wt.%, 0.020 wt.%, 0.021 wt.%, 0.022 wt.%, 0.023 wt.%, 0.024 wt.%, 0.025 wt.% And corresponding intermediate values , A rhenium content of between 0 and 3.10 wt.% Includes, for example, mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60% by weight, 2.70% by weight, 2.80% by weight, 2.90% by weight, 3.00% by weight and 3.10% by weight and corresponding intermediate values. A manganese content of between 0 and 1.60 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight, 1.00% by weight, 1.05% by weight, 1.10% by weight, 1.15% by weight, 1.20% by weight, 1.25% by weight, 1, 30% by weight, 1.35% by weight, 1.40% by weight, 1.45% by weight, 1.50% by weight, 1.55% by weight or 1.60% by weight and corresponding intermediate values understand. A copper content of between 0 and 0.50 wt.% Includes, for example, mass fractions of 0 wt.%, 0.01 wt.%, 0.02 wt.%, 0.03 wt.%, 0.04 wt. , 0.05% by weight, 0.06% by weight, 0.07% by weight, 0.08% by weight, 0.09% by weight, 0.10% by weight, 0.11% by weight, 0.12 wt.%, 0.13 wt.%, 0.14 wt.%, 0.15 wt.%, 0.16 wt.%, 0.17 wt.%, 0.18 wt.%, 0 , 19 wt%, 0.20 wt%, 0.21 wt%, 0.22 wt%, 0.23 wt%, 0.24 wt%, 0.25 wt%, 0, 26 wt%, 0.27 wt%, 0.28 wt%, 0.29 wt%, 0.30 wt%, 0.31 wt%, 0.32 wt%, 0.33 Wt.%, 0.34 wt.%, 0.35 wt.%, 0.36 wt.%, 0.37 wt.%, 0.38 wt.%, 0.39 wt.%, 0.40 wt .%, 0.41 wt.%, 0.42 wt.%, 0.43 wt.%, 0.44 wt.%, 0.45 wt.%, 0.46 wt.%, 0.47 wt. %, 0.48 wt.%, 0.49 wt.% And 0.50 wt.% And corresponding intermediate values. Examples of carbon contents between 0 and 3.30 wt.% Are mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60% by weight, 2.70% by weight, 2.80% by weight, 2.90% by weight, 3.00% by weight, 3.10% by weight, 3.20% by weight and 3.30 % By weight and corresponding intermediate values. By way of example, a vanadium content of between 0 and 1.00% by weight includes mass fractions of 0% by weight, 0.05% by weight, 0.10% by weight, 0.15% by weight, 0.20% by weight. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight and 1.00% by weight and corresponding intermediate values. A hafnium content of between 0 and 1.60 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight, 1.00% by weight, 1.05% by weight, 1.10% by weight, 1.15% by weight, 1.20% by weight, 1.25% by weight, 1, 30% by weight, 1.35% by weight, 1.40% by weight, 1.45% by weight, 1.50% by weight, 1.55% by weight or 1.60% by weight and corresponding intermediate values understand. A silicon content of between 0 and 1.20 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight, 1.00% by weight, 1.05% by weight, 1.10% by weight, 1.15% by weight and 1.20% by weight and corresponding intermediate values. The mass fraction of other elements, for example tin or zirconium, is in total between 0 and 0.50% by weight and is thus for example 0% by weight, 0.01% by weight, 0.02% by weight, 0.03% by weight .%, 0.04 wt.%, 0.05 wt.%, 0.06 wt.%, 0.07 wt.%, 0.08 wt.%, 0.09 wt.%, 0.10 wt. %, 0.11 wt%, 0.12 wt%, 0.13 wt%, 0.14 wt%, 0.15 wt%, 0.16 wt%, 0.17 wt% , 0.18 wt.%, 0.19 wt.%, 0.20 wt.%, 0.21 wt.%, 0.22 wt.%, 0.23 wt.%, 0.24 wt.%, 0.25 wt.%, 0.26 wt.%, 0.27 wt.%, 0.28 wt.%, 0.29 wt.%, 0.30 wt.%, 0.31 wt.%, 0 , 32 wt.%, 0.33 wt.%, 0.34 wt.%, 0.35 wt.%, 0.36 wt.%, 0.37 wt.%, 0.38 wt.%, 0, 39 wt%, 0.40 wt%, 0.41 wt%, 0.42 wt%, 0.43 wt%, 0.44 wt%, 0.45 wt%, 0.46 % By weight, 0.47% by weight, 0.48% by weight, 0.49% by weight or 0.50% by weight, each individual other element having a mass fraction of at most 0.20% by weight. The 100% missing mass fraction is formed by nickel, which always has a minimum mass fraction of 30% by weight. It is understood that the mass fractions of all alloying elements of the alloy are always and exclusively complementary to 100%. The above-described Nickel-based alloy allows a particularly flexible adaptation to different requirement profiles and is particularly suitable as a heat-resistant or highly heat-resistant material for turbine and engine components.

Alternatively, it is provided in a further advantageous embodiment of the invention that the chromium-containing alloy is formed as a steel alloy and has the following composition in percent by mass:
1.0 to 18.00% by weight Cr
0 to 4.50 wt.% Cu
0 to 26.00 wt% Ni
0 to 7.70% by weight of Co
0 to 4.50 wt% Mo
0 to 3.50 wt.% W
0 to 1.0% by weight V
0 to 2.00% by weight Mn
0 to 0.65 wt.% Nb
0.03 to 1.0 wt.% C
0 to 1.2% by weight of Si
0 to 2.20 wt.% Ti
0 to 2.20% by weight of other elements in total, of which each other element is not more than 0.90% by weight
Remainder Fe, but at least 50% by weight.

As already stated in connection with the abovementioned nickel-based alloy, all intermediate values of the respective range indications are to be regarded as being disclosed. Accordingly, with a chromium content of between 1.0 and 18.00% by weight, for example, mass fractions of 1.00% by weight, 1.10% by weight, 1.20% by weight, 1.30% by weight, 1 , 40 wt%, 1.50 wt%, 1.60 wt%, 1.70 wt%, 1.80 wt%, 1.90 wt%, 2.00 wt%, 2, 10 wt%, 2.20 wt%, 2.30 wt%, 2.40 wt%, 2.50 wt%, 2.60 wt%, 2.70 wt%, 2.80 % By weight, 2.90% by weight, 3.00% by weight, 3.10% by weight, 3.20% by weight, 3.30% by weight, 3.40% by weight, 3.50% by weight .%, 3.60 wt.%, 3.70 wt.%, 3.80 wt.%, 3.90 wt.%, 4.00 wt.%, 4.10 wt.%, 4.20 wt. %, 4.30 wt%, 4.40 wt%, 4.50 wt%, 4.60 wt%, 4.70 wt%, 4.80 wt%, 4.90 wt% , 5.00% by weight, 5.10% by weight, 5.20% by weight, 5.30% by weight, 5.40% by weight, 5.50% by weight, 5.60% by weight, 5.70% by weight, 5.80% by weight, 5.90% by weight, 6.00% by weight, 6.10% by weight, 6.20% by weight, 6.30% by weight, 6 , 40% by weight, 6.50% by weight, 6.60% by weight, 6.70% by weight, 6.80% by weight, 6.90% by weight, 7.00% by weight, 7, 10 wt%, 7.20 wt%, 7.30 wt%, 7.40 wt%, 7.50 wt%, 7.60 wt%, 7.70 wt%, 7.80 % By weight, 7.90% by weight, 8.00% by weight, 8.10% by weight, 8.20% by weight, 8.30% by weight, 8.40 % By weight, 8.50% by weight, 8.60% by weight, 8.70% by weight, 8.80% by weight, 8.90% by weight, 9.00% by weight, 9.10% by weight .%, 9.20 wt.%, 9.30 wt.%, 9.40 wt.%, 9.50 wt.%, 9.60 wt.%, 9.70 wt.%, 9.80 wt. %, 9.90 wt%, 10.00 wt%, 10.10 wt%, 10.20 wt%, 10.30 wt%, 10.40 wt%, 10.50 wt% , 10.60 wt.%, 10.70 wt.%, 10.80 wt.%, 10.90 wt.%, 11.00 wt.%, 11.10 wt.%, 11.20 wt.%, 11.30 wt.%, 11.40 wt.%, 11.50 wt.%, 11.60 wt.%, 11.70 wt.%, 11.80 wt.%, 11.90 wt.%, 12 , 00 wt%, 12.10 wt%, 12.20 wt%, 12.30 wt%, 12.40 wt%, 12.50 wt%, 12.60 wt%, 12, 70 wt%, 12.80 wt%, 12.90 wt%, 13.00 wt%, 13.10 wt%, 13.20 wt%, 13.30 wt%, 13.40 % By weight, 13.50% by weight, 13.60% by weight, 13.70% by weight, 13.80% by weight, 13.90% by weight, 14.00% by weight, 14.10% by weight .%, 14.20 wt.%, 14.30 wt.%, 14.40 wt.%, 14.50 wt.%, 14.60 wt.%, 14.70 wt.%, 14.80 wt. %, 14.90 wt%, 15.00 wt%, 15.10 wt%, 15.20 wt%, 15.30 wt%, 15.40 wt%, 15.50 wt% , 15.60 wt.%, 15.70 wt.%, 15.80 wt.%, 15.90 wt.%, 16.00 wt.%, 16.10 wt.%, 16.20 % By weight, 16.30% by weight, 16.40% by weight, 16.50% by weight, 16.60% by weight, 16.70% by weight, 16.80% by weight, 16.90% by weight .%, 17.00 wt.%, 17.10 wt.%, 17.20 wt.%, 17.30 wt.%, 17.40 wt.%, 17.50 wt.%, 17.60 wt. %, 17.70% by weight, 17.80% by weight, 17.90% by weight and 18.00% by weight and corresponding intermediate values. A copper content of between 0 and 4.50 wt.% Includes, for example, mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60 wt%, 2.70 wt%, 2.80 wt%, 2.90 wt%, 3.00 wt%, 3.10 wt%, 3.20 wt%, 3.30 % By weight, 3.40 wt.%, 3.50 wt.%, 3.60 wt.%, 3.70 wt.%, 3.80 wt.%, 3.90 wt.%, 4.00 wt %, 4.10% by weight, 4.20% by weight, 4.30% by weight, 4.40% by weight or 4.50% by weight and corresponding intermediate values. A nickel content of between 0 and 26.00 wt.% Includes, for example, mass fractions of 0.0 wt.%, 0.5 wt.%, 1.0 wt.%, 1.5 wt.%, 2.0 wt .%, 2.5 wt.%, 3.0 wt.%, 3.5 wt.%, 4.0 wt.%, 4.5 wt.%, 5.0 wt.%, 5.5 wt. %, 6.0% by weight, 6.5% by weight, 7.0% by weight, 7.5% by weight, 8.0% by weight, 8.5% by weight, 9.0% by weight , 9.5% by weight, 10.0% by weight, 10.5% by weight, 11.0% by weight, 11.5% by weight, 12.0% by weight, 12.5% by weight, 13.0 wt%, 13.5 wt%, 14.0 wt%, 14.5 wt%, 15.0 wt%, 15.5 wt%, 16.0 wt%, 16 , 5 wt.%, 17.0 wt.%, 17.5 wt.%, 18.0 wt.%, 18.5 wt.%, 19.0 wt.%, 19.5 wt.%, 20, 0% by weight, 20.5% by weight, 21.0% by weight, 21.5% by weight, 22.0% by weight, 22, 5 wt%, 23.0 wt%, 23.5 wt%, 24.0 wt%, 24.5 wt%, 25.0 wt%, 25.5 wt% or 26.0 % By weight and corresponding intermediate values. A cobalt content of between 0 and 7.70 wt.% Includes, for example, mass fractions of 0 wt.%, 0.20 wt.%, 0.40 wt.%, 0.60 wt.%, 0.80 wt. , 1.00% by weight, 1.20% by weight, 1.40% by weight, 1.60% by weight, 1.80% by weight, 2.00% by weight, 2.20% by weight, 2.40 wt.%, 2.60 wt.%, 2.80 wt.%, 3.00 wt.%, 3.20 wt.%, 3.40 wt.%, 3.60 wt.%, 3 , 80% by weight, 4.00% by weight, 4.20% by weight, 4.40% by weight, 4.60% by weight, 4.80% by weight, 5.00% by weight, 5, 20 wt%, 5.40 wt%, 5.60 wt%, 5.80 wt%, 6.00 wt%, 6.20 wt%, 6.40 wt%, 6.60 % By weight, 6.80% by weight, 7.00% by weight, 7.20% by weight, 7.40% by weight, 7.60% by weight or 7.70% by weight and corresponding intermediate values , A molybdenum content of between 0 and 4.50 wt.% Includes, for example, mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60 wt%, 2.70 wt%, 2.80 wt%, 2.90 wt%, 3.00 wt%, 3.10 wt%, 3.20 wt%, 3.30 % By weight, 3.40 wt.%, 3.50 wt.%, 3.60 wt.%, 3.70 wt.%, 3.80 wt.%, 3.90 wt.%, 4.00 wt %, 4.10% by weight, 4.20% by weight, 4.30% by weight, 4.40% by weight or 4.50% by weight and corresponding intermediate values. By way of example, a proportion by weight of tungsten between 0 and 3.50% by weight contains from 0% by weight, 0.10% by weight, 0.20% by weight, 0.30% by weight, 0.40% by weight. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60 wt%, 2.70 wt%, 2.80 wt%, 2.90 wt%, 3.00 wt%, 3.10 wt%, 3.20 wt%, 3.30 % By weight, 3.40% by weight or 3.50% by weight and corresponding intermediate values. A vanadium content of between 0 and 1.0 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight or 1.0% by weight. For example, a manganese content of between 0 and 2.00 wt.% Includes mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt.%. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight or 2.0% by weight and corresponding intermediate values. A niobium content of between 0 and 0.65 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.% Or 0.65 wt.% And corresponding intermediate values. By way of example, a carbon content of between 0.03 and 1.0% by weight comprises mass fractions of 0.03% by weight, 0.05% by weight, 0.07% by weight, 0.09% by weight, 0, 11 wt%, 0.13 wt%, 0.15 wt%, 0.17 wt%, 0.19 wt%, 0.21 wt%, 0.23 wt%, 0.25 % By weight, 0.27 wt.%, 0.29 wt.%, 0.31 wt.%, 0.33 wt.%, 0.35 wt.%, 0.37 wt.%, 0.39 wt .%, 0.41 wt.%, 0.43 wt.%, 0.45 wt.%, 0.47 wt.%, 0.49 wt.%, 0.51 wt.%, 0.53 wt. %, 0.55 wt.%, 0.57 wt.%, 0.59 wt.%, 0.61 wt.%, 0.63 wt.% And 0.65 wt.% And corresponding intermediate values. A silicon content of between 0 and 1.2 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.%, 0.50 wt.%, 0.55 wt.%, 0.60 wt.%, 0.65 wt.%, 0.70 wt.%, 0.75 wt.%, 0.80 wt.%, 0.85 wt.%, 0.90 wt.%, 0 , 95% by weight, 1.00% by weight, 1.05% by weight, 1.10% by weight, 1.15% by weight or 1.2% by weight and corresponding intermediate values. A titanium content of between 0 and 2.20 wt.% Includes, for example, mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight or 2.20% by weight and corresponding intermediate values. The mass fraction of other elements, for example of tin or zirconium, is in total between 0 and 2.20% by weight and is thus for example 0% by weight, 0.10% by weight, 0.20% by weight, 0.30% by weight .%, 0.40 wt.%, 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt. %, 1.10 wt%, 1.20 wt%, 1.30 wt%, 1.40 wt%, 1.50 wt%, 1.60 wt%, 1.70 wt% , 1.80% by weight, 1.90% by weight, 2.00% by weight, 2.10% by weight or 2.20% by weight, each individual other element having a mass fraction of at most 0.90% by weight. % having. The 100% missing mass fraction is formed by iron, which always has a minimum mass fraction of 50 wt.%. It is understood that the mass fractions of all alloying elements of the alloy are always and exclusively complementary to 100%. The steel alloy described above allows a particularly flexible adaptation to different requirement profiles and is generally suitable in particular for the production of cast, cast-over, forged and / or rolled turbine and engine components.

In a further advantageous embodiment of the invention, the chromium-containing alloy is formed as a cobalt-based alloy and has the following composition in percent by mass:
0 to 0.25 wt.% Al
0.1 to 0.7% by weight C
18.00 to 25.00 wt.% Cr
0 to 0.2% by weight of Cu
0 to 4.00 wt.% Fe
0 to 1.7% by weight Mn
5.00 to 12.00 wt% Ni
0 to 0.50 wt.% Si
0 to 3.7% by weight Ta
5.00 to 16.00 wt.% W
0 to 0.5% by weight of Ti
0 to 0.5% by weight Zr
0 to 2.00% by weight of other elements in total, of which each other element is not more than 0.50% by weight
Residual Co, but at least 50% by weight.

As already stated in connection with the abovementioned nickel-base alloy and the steel alloy, all intermediate values of the respective area indications are to be regarded as being disclosed. Accordingly, with an aluminum content of between 0 and 0.25 wt.%, For example, mass fractions of 0 wt.%, 0.01 wt.%, 0.02 wt.%, 0.03 wt.%, 0.04 wt. %, 0.05 wt%, 0.06 wt%, 0.07 wt%, 0.08 wt%, 0.09 wt%, 0.10 wt%, 0.11 wt% , 0.12 wt.%, 0.13 wt.%, 0.14 wt.%, 0.15 wt.%, 0.16 wt.%, 0.17 wt.%, 0.18 wt.%, 0.19 wt.%, 0.20 wt.%, 0.21 wt.%, 0.22 wt.%, 0.23 wt.%, 0.24 wt.% Or 0.25 wt.%, And the like To understand intermediate values. Examples of carbon contents between 0.1 and 0.7% by weight are 0.10% by weight, 0.15% by weight, 0.20% by weight, 0.25% by weight, 0, 30 wt%, 0.35 wt%, 0.40 wt%, 0.45 wt%, 0.50 wt%, 0.55 wt%, 0.60 wt%, 0.65 % By weight or 0.7% by weight and corresponding intermediate values. By a proportion of chromium between 18.00 and 25.00% by weight, for example, mass fractions of 18.00% by weight, 18.20% by weight, 18.40% by weight, 18.60% by weight, 18, 80 wt.%, 19.00 wt.%, 19.20 wt.%, 19.40 wt.%, 19.60 wt.%, 19.80 wt.%, 20 wt.%, 20.20 wt. %, 20.40 wt.%, 20.60 wt.%, 20.80 wt.%, 21.00 wt.%, 21.20 wt.%, 21.40 wt.%, 21.60 wt.% , 21.80% by weight, 22.00% by weight, 22.20% by weight, 22.40% by weight, 22.60% by weight, 22.80% by weight, 23.00% by weight, 23.20 wt%, 23.40 wt%, 23.60 wt%, 23.80 wt%, 24.00 wt%, 24.20 wt%, 24.40 wt%, 24 , 60% by weight, 24.80% by weight or 25.00% by weight and corresponding intermediate values. A proportion of copper between 0 and 0.2% by weight, for example, contains mass fractions of 0% by weight, 0.01% by weight, 0.02% by weight, 0.03% by weight, 0.04% by weight. , 0.05% by weight, 0.06% by weight, 0.07% by weight, 0.08% by weight, 0.09% by weight, 0.10% by weight, 0.11% by weight, 0.12 wt.%, 0.13 wt.%, 0.14 wt.%, 0.15 wt.%, 0.16 wt.%, 0.17 wt.%, 0.18 wt.%, 0 , 19% by weight or 0.20% by weight and corresponding intermediate values. An iron content of between 0 and 4.00 wt.% Includes, for example, mass fractions of 0 wt.%, 0.10 wt.%, 0.20 wt.%, 0.30 wt.%, 0.40 wt. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.%, 1.70 wt.%, 1.80 wt.%, 1 , 90% by weight, 2.00% by weight, 2.10% by weight, 2.20% by weight, 2.30% by weight, 2.40% by weight, 2.50% by weight, 2, 60 wt%, 2.70 wt%, 2.80 wt%, 2.90 wt%, 3.00 wt%, 3.10 wt%, 3.20 wt%, 3.30 % By weight, 3.40% by weight, 3.50% by weight, 3.60% by weight, 3.70% by weight, 3.80% by weight, 3.90% by weight or 4.00% by weight .% and corresponding intermediate values. By way of example, a manganese content of between 0 and 1.7% by weight includes mass fractions of 0% by weight, 0.10% by weight, 0.20% by weight, 0.30% by weight, 0.40% by weight. , 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt.%, 1.20 wt.%, 1.30 wt.%, 1.40 wt.%, 1.50 wt.%, 1.60 wt.% Or 1.70 wt.% And corresponding intermediate values. By way of example, a nickel content of between 5.00 and 12.00 wt.% Includes mass fractions of 5.00 wt.%, 5.20 wt.%, 5.40 wt.%, 5.60 wt.%, 5, 80 wt%, 6.00 wt%, 6.20 wt%, 6.40 wt%, 6.60 wt%, 6.80 wt%, 7.00 wt%, 7.20 % By weight, 7.40% by weight, 7.60% by weight, 7.80% by weight, 8.00% by weight, 8.20% by weight, 8.40% by weight, 8.60% by weight .%, 8.80 wt.%, 9.00 wt.%, 9.20 wt.%, 9.40 wt.%, 9.60 wt.%, 9.80 wt.%, 10.00 wt. %, 10.20 wt%, 10.40 wt%, 10.60 wt%, 10.80 wt%, 11.00 wt%, 11.20 wt%, 11.40 wt% , 11.60 wt.%, 11.80 wt.% Or 12.00 wt.% And corresponding intermediate values. A silicon content of between 0 and 0.50 wt.% Includes, for example, mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.% Or 0.50 wt.% And corresponding intermediate values. For example, a tantalum content of between 0 and 3.7 wt.% Includes mass fractions of 0.0 wt.%, 0.1 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt .%, 0.5 wt.%, 0.6 wt.%, 0.7 wt.%, 0.8 wt.%, 0.9 wt.%, 1.0 wt.%, 1.1 wt. %, 1.2% by weight, 1.3% by weight, 1.4% by weight, 1.5% by weight, 1.6% by weight, 1.7% by weight, 1.8% by weight , 1.9% by weight, 2.0% by weight, 2.1% by weight, 2.2% by weight, 2.3% by weight, 2.4% by weight, 2.5% by weight, 2.6% by weight, 2.7% by weight, 2.8% by weight, 2.9% by weight, 3.0% by weight, 3.1% by weight, 3.2% by weight, 3 , 3% by weight, 3.4% by weight, 3.5% by weight, 3.6% by weight or 3.7% by weight and corresponding intermediate values. For example, a tungsten content of between 5.00 and 16.00 wt.% Includes mass fractions of 5.00 wt.%, 5.50 wt.%, 6.00 wt.%, 6.50 wt.%, 7, 00% by weight, 7.50% by weight, 8.00% by weight, 8.50% by weight, 9.00% by weight, 9.50% by weight, 10.00% by weight, 10.50% by weight, 11 , 00 wt%, 11.50 wt%, 12.00 wt%, 12.50 wt%, 13.00 wt%, 13.50 wt%, 14.00 wt%, 14, 50% by weight, 15.00% by weight, 15.50% by weight or 16.00% by weight and corresponding intermediate values. A titanium content of between 0 and 0.5% by weight includes, for example, proportions by weight of 0% by weight, 0.05% by weight, 0.10% by weight, 0.15% by weight, 0.20% by weight. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.% Or 0.5 wt.% And corresponding intermediate values. For example, a zirconium content of between 0 and 0.5 wt.% Includes mass fractions of 0 wt.%, 0.05 wt.%, 0.10 wt.%, 0.15 wt.%, 0.20 wt.%. , 0.25 wt.%, 0.30 wt.%, 0.35 wt.%, 0.40 wt.%, 0.45 wt.% Or 0.5 wt.% And corresponding intermediate values. The mass fraction of other elements is in total between 0 and 2.00% by weight and is thus for example 0% by weight, 0.10% by weight, 0.20% by weight, 0.30% by weight, 0.40% by weight .%, 0.50 wt.%, 0.60 wt.%, 0.70 wt.%, 0.80 wt.%, 0.90 wt.%, 1.00 wt.%, 1.10 wt. %, 1.20 wt%, 1.30 wt%, 1.40 wt%, 1.50 wt%, 1.60 wt%, 1.70 wt%, 1.80 wt% , 1.90% by weight or 2.00% by weight, each individual other element in each case having a mass fraction of at most 0.50% by weight. The 100% missing mass fraction is formed by cobalt, which always has a minimum mass fraction of 50 wt.% Has. It is understood that the mass fractions of all alloying elements of the alloy are always and exclusively complementary to 100%. The cobalt-base alloy described above allows a particularly flexible adaptation to different requirement profiles and is generally suitable in particular for producing heat-resistant or highly heat-resistant turbine and engine components.

In a further advantageous embodiment of the invention, the chromium-containing alloy is formed as a wrought alloy and / or as a casting alloy. A wrought alloy is understood within the scope of the invention to mean an alloy which can or should be further shaped after the primary shaping by rolling, forging, pressing, drawing and the like. In the context of the invention, a casting alloy is understood to mean an alloy which, during the primary shaping, for example during casting and the like, obtains its shape and, as a rule, can only be machined or machined. As a result, the alloy can be optimally adapted to their respective application.

A third aspect of the invention relates to a component for a thermal gas turbine, in particular for an aircraft engine. It is provided according to the invention that the component consists partially or completely of a chromium-containing alloy, which is produced by means of a method according to the first aspect of the invention and / or formed according to the second aspect of the invention. The resulting features and their advantages are described in the descriptions of the first and second aspect of the invention, with advantageous embodiments of the first and second aspects of the invention are to be regarded as advantageous embodiments of the third aspect of the invention and vice versa. Because of the higher strength potential of the alloy containing chromium, the component can also be made thinner, which also significantly reduces the weight of the engine. A further reduction in weight results from the fact that lighter engines positively affect the cell wing construction of aircraft (low stress), so that it can be designed to save weight accordingly.

A fourth aspect of the invention relates to a method of inspecting an alloy. The method comprises at least the steps of providing a test specimen made of the alloy, generating a first sample surface on the test specimen, blasting the first specimen surface, generating a second specimen surface on the specimen, the second specimen surface in the region of the first specimen surface and at an angle to the first specimen surface and examining at least one region of the second sample surface, wherein at least one parameter from the group of inclusions, microstructure and elemental composition is determined in the region of the second sample surface. As already mentioned, the chemical composition of an alloy is specified in corresponding factory standards. In this specification are usually in addition to the mass fractions of the mandatory alloying elements and the maximum allowable mass fractions of impurities such. As phosphorus, sulfur, etc. set. However, the degree of purity of the alloying elements used in the production is not specified, so that the manufacturer of the respective alloy is limited in the purity of the alloying elements used only with regard to the final composition of the alloy. In other words, the manufacturer only has to make sure that the alloy melted by him meets the specification of the chemical composition. Systematic investigations of contamination of the alloying elements used with the aim of determining the alloying element (s) with the greatest proportion of negative effects on the finished alloy were therefore hitherto unknown. It was also not known that invisible structures caused cracks in the first place and thus strongly affected the strength straps. The present invention is based on the knowledge that only with this knowledge can the causes for reduced strength properties of an alloy be meaningfully investigated. As soon as that alloying element or those alloying elements is or are determined, the or a negative Influence on the material quality of the finished alloy, the material quality of the alloys in question can be targeted improved and the range of certain material properties can be reduced by the or the respective alloying elements are used in the production of the alloy in a sufficiently high purity or. The method according to the invention makes it possible for the first time to make hitherto unknown, crack-triggering microstructures visible and chemically analyzable. An inference to the alloyed elements causing these crack-triggering microstructures, including their inclusions, enables the targeted optimization of the respective alloy melt by using this alloying element with a correspondingly higher degree of purity.

Until now, it has been customary to apply a finish perpendicular to a blasted, for example shot-blasted, surface of a porous body made of an alloy to be examined in order to metallographically examine the surface deformation caused by shot peening. However, this method is not suitable for investigating line-like microstructures in the bottom area of the depression caused by the blasting medium, since the cut represents only a section through the blasting medium impressions. However, as the Applicant has recognized, it is important to study the near-surface ground caused by the blast media in order to be able to infer crack-inducing microstructures. Therefore, in the context of the method according to the invention, a second sample surface is produced in the region of the first sample surface on the test piece, the second sample surface being arranged at an angle of> 0 ° to the first sample surface. As a result, an oblique cut surface is produced by the blasted first sample surface, wherein the cut surface also extends through the lowest points of the blasting agent base regions produced by the impact of the blasting medium. It is understood that the inventive method is not limited in principle to the investigation of chromium-containing alloys.

In an advantageous embodiment of the invention, the first sample surface and / or the second sample surface is produced by a separation process, in particular by grinding and / or polished after your production. This allows a particularly precise examination of the specimen done.

Further advantages arise when the region of the second sample surface is examined by means of light microscopy and / or scanning electron beam microscopy and / or energy-dispersive X-ray spectroscopy. This allows a particularly fast and precise determination of the parameter (s) to be examined.

In a further advantageous embodiment of the invention, the specimen is arranged before generating the second sample surface in a positioning device, by means of which the angle of the second sample surface relative to the first sample surface is adjusted. With the aid of such a positioning device, the position and arrangement of the second sample surface relative to the first sample surface can be set particularly precisely and reproducibly.

Particularly fast and precise references to the alloying element (s) used in the production of the alloy having too low a purity can be obtained in a further embodiment of the invention by determining at least one inclusion in the structure of the alloy and a quantitative elemental analysis of the inclusion is carried out.

A particularly precise identification of at least one alloying element which was used with too low a degree of purity is made possible in a further embodiment of the invention by carrying out a quantitative elemental analysis of an element used in the production of the alloy and / or a master alloy used in the production of the alloy at least one element used in the preparation of the alloy is identified by comparison with the elemental analysis of the inclusion, which is the cause of the inclusion due to a too low degree of purity.

Further features of the invention will become apparent from the claims, the exemplary embodiments and with reference to the drawings. The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the exemplary embodiments can be used not only in the particular combination specified, but also in other combinations, without departing from the scope of the invention. Showing:

1 a schematic diagram of a method according to the invention for examining a sample consisting of a chromium-containing alloy;

2 a light micrograph of a dark microstructure in the center of a ball impression in the specimen;

3 a light micrograph of technically pure chromium with a purity of 99.0%;

4 a scanning electron micrograph of a chromium-containing alloy, in the production of technically pure chromium was used; and

5 a light micrograph of electrolytically produced chromium flakes with a purity of at least 99.8%.

1 shows a schematic diagram of a method according to the invention for examining a sample consisting of a chromium-containing alloy 10 , On the test piece 10 For example, which may be taken from a component of an aircraft engine, for example, by grinding a first sample surface 12 produced, which is then polished. Subsequently, the first sample surface 12 according to arrow I shot peened, whereby corresponding recesses 14 on the surface 15 of the test piece 10 arise whose geometry substantially corresponds to the geometry of the blasting material used. The test piece 10 with the shot peened surface 15 is then placed down in an embedding form a positioning device (not shown) and embedded in plastic by means of an embedding press. By grinding then becomes a second sample surface 16 on the test piece 10 produced and optionally polished. Grinding and polishing take place directly in the shot peened surface 15 , but at an angle to the first sample surface 12 or to the shot peened surface 15 , The angle used, for example, 0.1 °, 0.6 °, 1.1 °, 1.6 °, 2.1 °, 2.6 °, 3.1 °, 3.6 °, 4.1 °, 4.6, 5.1, 5.6, 6.1, 6.6, 7.1, 7.6, 8.1, 8.6, 9.1 °, 9.6 °, 10.1 °, 10.6 °, 11.1 °, 11.6 °, 12.1 °, 12.6 °, 13.1 °, 13.6 °, 14.1 °, 14.6 ° or more, can be set reproducibly using the positioning device. For this purpose, the embedding mold and the embedding press of the positioning device must be manufactured so precisely that there is always an exact horizontal position of the shot-blasted surface laid down into the embedding mold 15 is guaranteed. Before embedding can under one side of the shot peened surface 15 a narrow film can be laid to a defined skew of the specimen 10 adjust. It can be seen in the lower figure, which is a schematic plan view of the second sample surface 16 of the thus pretreated specimen 10 shows that thereby a cut surface through the recesses 14 arises, which obliquely through the depressions 14 runs. As a first approximation, three areas are formed Ia . ib . ic out. Area Ia consists of the only slightly ground, shot blasted surface 15 , where all ball impressions or depressions 14 still clearly visible. Area ib leaves much less ball impressions or depressions 14 as an area Ia detect. Area ic shows no more ball impressions. In the area Ia can therefore the upper areas of the wells 14 , in the area ib the bottom areas of the depressions 14 and in the area ic those areas of the specimen 10 be examined before generating the second sample surface 16 immediately below the wells 14 lay. While area Ia Due to massive deformation by shot peening partially no selective metallographic examination allows, one can especially in area ib Both in light microscopy as well as in SEM investigations previously unknown microstructures in the center of the wells 14 detect.

2 shows a light micrograph of an elongated, dark, crack-promoting microstructure 18 in the center of a ball impression or a depression 14 in the area ib of the test piece 10 at 1000x magnification. The test piece 10 consists of a conventional IN 718 alloy. Typical is the bulging shape with line-like appendages. Because of their resemblance to seahorses, these microstructures can 18 as "seahorse-like structures"("seahorsestructures", abbreviated "(sl) -structures"). With the help of scanning electron micrographs (SEM image) it can be seen that the line-like microstructure 18 deeper than their environment is or appears as a ditch. These "(sl) -structures" are explained as follows:
These are soft areas that are invisible with the aid of previous methods and could not be cured, ie contain practically no γ '' precipitates. It can be assumed that certain impurities, for example Si, have become more concentrated (yet invisible) during the solution annealing process than have remained in the base material on the lines of the "(sl) -structure" and their immediate surroundings, thereby forming γ '. 'Exemptions have largely prevented. These soft areas are massively deformed or solidified by shot peening and appear as a trench in the SEM, while they appear black in the light microscope because they are lower than their surroundings.

The strong consolidation of the "(sl) -structures" by shot peening of the components leads to a significantly longer life of dynamically stressed components. This, according to Applicants, is presumably explained by the fact that the strong solidification blocks the deformation and diffusion processes which are necessary for the formation of crack initiating linear areas. First in areas ( ic ) below the shot peened surface 15 in which these deformation and diffusion processes take place again, cracks can therefore be initiated.

So far, it is known that many fatigue cracks emanate from the component surface. Therefore, compressive stresses introduced into the component surface by shot peening should prevent the formation and propagation of cracks and thus significantly increase the service life of dynamically stressed components. The fact that crack-initiating "(sl) -structures" are an important factor influencing the fatigue strength of components must now be included as a new insight into the fundamental considerations regarding the influence of shot peening on the service life of the components concerned.

While the analysis by means of energy dispersive X-ray spectroscopy (EDX analysis) of the with arrow II marked area within the microstructure 18 yielded nearly equal Cr and Ni peaks, the EDX analysis of the base material (IN 718) in the immediate vicinity of the "(sl) -structure" 18 detect a significantly lower Cr peak than Ni peak. Remarkable here are the significantly higher Si and O peaks than in the base material.

With the help of an unrecorded SEM image could in a sample body 10 from an IN 718 LCF alloy, cracking on a line-like bright phase in a "sl" -structure near a fracture surface is further detected. This phase is created by deformation and diffusion processes that occur during crack initiation and crack propagation under dynamic loading. EDX analyzes of similar phases give comparable results, ie higher Cr, Si and O peaks compared to the IN 718 base material.

The metallographic investigation of the "(sl) -structure" showed that Ni (mass fraction: up to 55%, purity level: 99.0%) and Fe (mass fraction: max.19%, purity 99.0%) are far from that many oxide inclusions such as the technically pure chromium used (mass fraction: up to 21%, purity: 99.0%). 3 shows for clarity a light micrograph of technically pure, aluminothermisch chromium produced with a corresponding purity of 99.0%. It can be seen that the technically pure chrome with inclusions is completely interspersed. The volume fraction of all inclusions is up to about 4% or more. It is striking that some of these inclusions also occur in the form of "(sl) -structures". Some voids are pores partially filled with an inclusion (black area). The EDX area analysis of the site IIIa in the black area, in addition to a high Cr, a high O peak and small amounts of C, Al, Si and Ca were found. The EDX point analysis in place IIIb at the edge of the "(sl) -structure" shows a very high Si-peak. The EDX point analysis in place IIIc (small round inclusion) gave a very high Al peak.

The finding that in "(sl) -structures" generally significantly higher Cr, O and Si peaks than in the base material could be detected, indicates that the crack-triggering line-like microstructures 18 essentially due to oxidic inclusions, which have passed through the technically pure chromium in the IN 718 alloy melt.

4 shows for further clarification a scanning electron micrograph of a chromium-containing Udimet alloy, in the production of technically pure chromium was used. For better reproducibility, the scanning electron micrograph was inverted, so that originally white areas black and originally black area are shown in white. Again, numerous crack-triggering, line-like, bright (or due to the inversion dark) "(sl) -structures" or vortex-like segregations, which consist of "(sl) -structures" are recognizable.

Also, an unillustrated metallographic cut of high chromium cast polycrystalline steel (16.7%), solution annealed and cured, exhibited numerous "sl-structures" that exist as pores as well as filled with inclusions or partially filled with inclusions occurred.

The quantitative analysis of electrolytically produced chromium flakes (purity: 99.8%) showed that they had significantly less oxide inclusions (inclusion content: 0.15%) than aluminothermically obtained technically pure chromium (purity: 99.0%; 4.00%). How to get out 5 which shows a light micrograph of electrolytically produced chromium flakes having a purity of at least 99.8%, the comparatively small increase in the degree of purity leads to a significant decrease in the number and size of inclusions, defects and the like. Only about 50% of the total volume has inclusions (inclusion ratio: 0.3%, relative to 50% of the total) Total volume), while about 50% of the total volume is completely inclusion-free. Based on the total volume, this results in an inclusion ratio of only 0.15%.

Since the incorporation of chromium inclusions into an alloy melt essentially influences the crack formation of the later alloy, in the case of chromium-containing alloys in the context of the invention technically pure chromium is exchanged for chromium flakes or other suitable chromium forms having a purity of ≥ 99.5% to significantly improve the alloy quality. The drastic reduction of the "(sl) -structures" ensures, in particular, an increase in the dynamic strength and a narrowing of the strength ribbons of alloys produced in this way. For example, components produced with chromium flakes in the in 1 shown area ib significantly fewer ball impressions than corresponding, manufactured with technically pure chrome components, the number and size of the "(sl) -structures" in the center of the ball impressions are significantly lower than in components manufactured with technically pure chrome.

If other alloying elements or master alloys have a purity of about 99.0% and have no more inclusions than the chromium flakes shown above (purity: ≥ 99.5%) and a comparable inclusion distribution as the chromium flakes shown above, is for a given alloy may also be sufficient to use elements with lower purity levels than 99.0%. However, if the inclusion content is exceeded and the inclusion distribution deviates from a given threshold, the degree of purity of the element concerned must be increased accordingly. The fact that a degree of purity of 99.0% or less is sufficient for some alloying elements, compared to the variant to use all elements or master alloys of a melt with a purity of ≥ 99.5%, a significant cost savings.

The quality of components, in particular engine components with higher strength potential, can be checked in addition to the method described above with the aid of LCF (low cycle fatigue) tests. A comparison of the LCF service life of components whose alloys were produced with technically pure chromium (purity: 99.0%) with components whose alloys contain chromium flakes (purity: ≥ 99.5%, preferably ≥ 99.8% ) or other chromium molds with appropriate degrees of purity showed that the components produced with chromium flakes compared to the components produced with technically pure chrome at least 10-fold LCF life, combined with a significant narrowing of the strength bumpers. The components can therefore be made thinner with the same strength, whereby corresponding space, weight and cost reductions are achieved.

In the following, various embodiments of chromium-containing alloys according to the invention are specified, in the production of which chromium with a purity of at least 99.5% is used in order to improve the material properties of the alloys concerned. Tables 1 and 2 initially specify specifications for chromium-containing nickel-based alloys which may be formed as wrought or cast alloys. Table 1: chromium-containing nickel-based alloys description Chemical composition, mass fractions in% (reference values) al C Co Cr Cu Fe Hf Mn Astroloy LC 4.0 0.02 17.0 15.0 - <0.5 - <0.15 C263 0.45 0.06 19.75 20.0 <0.2 <0.7 - <0.6 Hastelloy X <0.5 0.1 1.5 21.75 <0.5 18.5 - <1.0 Haynes 214 4.5 <0.1 <2.0 16.0 - 4.0 - <0.5 Haynes 230 0.35 0.1 <5.0 22.0 <0.5 <3.0 - 0.65 Haynes 242 <0.5 <0.03 - 8.0 <0.5 <2.0 - <0.8 Incoloy 901 <0.35 0.04 <1.0 12.5 <0.2 rest - <0.5 Incoloy 909 <0.15 <0.06 14.0 <1.0 <0.5 rest - <1.0 Inconel 625 <0.4 <0.1 <1.0 21.5 - <5.0 - <0.5; Inconel 718 0.5 <0.08 <1.0 19.0 <0.3 rest - <0.35 Inconel 718 0.6 0.03 <1.0 19.0 <0.1 <19,0 - <0.35 Inconel X750 0.7 <0.08 <1.0 15.5 <0.5 7 - <0.35 Nimonic 115 5.0 0.16 15.0 15.0 <0.2 <0.8 - <0.2 Nimonic 80A 1.4 0.07 <2.0 19.5 <0.2 <1.5 - <1.0 Nimonic 90 1.5 <3.13 18.0 19.5 <0.2 <1.5 - <1.0 PK33 2.1 <0.07 14.0 18.0 <0.2 <1.5 - <0.5 Rene 41 1.65 <0.12 11.0 19.0 <0.3 <5.0 - <0.1 Udimet 720 LI 2.5 0,015 14.75 16.0 <0.1 <0.5 - <0.15 waspaloy 1.4 0.05 13.5 19.5 <0.1 <2.0 - <0.1 B 1900 6.0 0.11 10.0 8.0 - <0.25 - <0.2 C263 cast 0.45 0.06 20.0 20.0 <0.2 <0.7 - <0.6 CMSX-4 5.6 <0.01 9.65 6.4 <0.005 <0.15 0.1 <0.01 CMSX-6 4.8 <0.006 5.0 10.0 <0.01 <0.15 0.09 <0.01 Inconel 100 5.5 0.18 15.0 9.5 <0.2 <1.0 - <0.2 Inconel 713 6.0 <0.2 <1.0 14.0 <0.5 <1.0 - <0.35 Inconel 713LC 6.0 0.05 <1.0 12.0 <0.5 <0.5 - <0.25 Inconel 718 casting 0.6 0.06 <1.0 19.0 <0.1 rest - <0.35 Inconel 738 LC 3.45 0.11 8.5 16.0 - <0.5 - <0.2 Inconel 792 3.4 0.08 9.0 12.5 <0.1 <0.5 - <0.15 Inconel 939 1.9 0.15 19.0 22.4 - <0.5 - <0.2 LEK94 6.5 <0.025 7.5 6.1 <0.03 <0.04 0.1 <0.03 M-247LC DS 5.55 0.09 9.25 8.25 <0.05 <0.2 1.3 <0.1 MAR-M247 5.5 0.15 10.0 8.4 <0.1 <0.25 1.4 <0.2 MAR M247LC 5.5 0.08 9.25 8.1 <0.05 <0.2 1.5 <0.1 PD16 5.9 0.1 <1.5 5.75 <0.5 <0.5 <0.00003 <0.5 SC2000 5.65 <0.05 10 5 <0.1 <0.2 0.1 <0.12 SRR99 5.5 0,015 5.0 8.5 <0.1 <0.1 <0.05 <0.1

Table 2: Chromium containing nickel base alloys (continued)

In the following Tables 3 and 4 chromium-containing steel alloys are specified, for the production of chromium with a purity of at least 99.5% was used to improve the material properties of the alloys in question. Table 3: chromium-containing steel alloys description Chemical composition, mass fractions in% (reference values) al C Co Cr Cu Fe Hf Mn 15-5PH - <0.07 - 14.75 3.5 rest - <1.0 I5-5PH cast - <0.07 - 14.75 3.5 rest - <1.0 15NiCrMol6 - 0.16 - 1.2 - rest - 0.4 17-4PH - <0.07 - 16.25 4.0 rest - <1.0 17-4PH cast - <0.06 - 16.1 3.15 rest - <0.7 A286 <0.35 <0.08 - 14.75 - rest - <2.0 A286 casting <0.35 <0.08 - 14.75 - rest - <1.25 Greek Ascoloy <0.15 0.18 - 13.0 <0.5 rest - <0.5 Greek Ascoloy font - 0.18 - 13.0 <0.5 rest - <1.0 H46 - 0.15 - 11.0 <0.5 rest - 0.8 Jethete M152 - 0.11 - 11.75 - rest - 0.7 M50 - 0.81 <0.25 4.0 <0.1 rest - <0.35 X105CrMol7 - 1.0 - 17.0 - rest - <1.0 X8CrCoNiMol1 - 0.08 6.25 10.65 - rest - 0.8 Table 4: chromium-containing steel alloys (continued)

Finally, in the following Tables 5 and 6 chromium-containing cobalt-base alloys are specified, for the production of which chromium with a purity of at least 99.5% was used in order to improve the material properties of the alloys concerned. Table 5: chromium-containing cobalt-base alloys description Chemical composition, mass fractions in% (reference values) al C Co Cr Cu Fe Hf Mn HS25 - 0.1 rest 20.0 - <3.0 - 1.5 MAR-M509 <0.25 0.6 rest 23.6 <0.1 <1.5 - <0.1 Table 6: Chromium containing cobalt base alloys (continued)

The material names of the chromium-containing alloys produced according to the invention can be renamed or supplemented for better distinction from conventionally produced alloys in z. B. IN 718 (high purity), Udimet 720LI (high purity) etc.

The parameter values given in the documents for the definition of process and measurement conditions for the characterization of specific properties of the subject invention are also within the scope of deviations - for example due to measurement errors, system errors, Einwaagefehlern, DIN tolerances and the like - as included in the scope of the invention ,

Claims (15)

Process for producing a chromium-containing alloy, characterized in that elemental chromium having a mean purity of at least 99.5% is used in the production. A method according to claim 1, characterized in that the chromium is used in the form of powder and / or in the form of flakes and / or in the form of ingots and / or in the form of ingots and / or granules for the preparation of the chromium-containing alloy. A method according to claim 1 or 2, characterized in that the chromium-containing alloy is produced using a master alloy. Chromium-containing alloy, in particular for producing a component for a thermal gas turbine, characterized in that it is obtainable or obtained by a production process in which elemental chromium is used with an average purity of at least 99.5%. Chromium-containing alloy according to claim 4, characterized in that it is formed as a nickel-based alloy and has the following composition in percent by mass: 1.00 to 24.00 wt.% Cr 0 to 19.50 wt.% Fe 0 to 7.00 wt.% Al 0 to 26.00% by weight Mo 0 to 21.00% by weight Co 0 to 5.20% by weight Ti 0 to 14.20% by weight W 0 to 8.90% by weight Ta 0 to 5, 60% by weight Nb 0 to 0.025 wt.% B 0 to 3.10 wt.% Re 0 to 1.60 wt.% Mn 0 to 0.50 wt.% Cu 0 to 3.3 wt.% C 0 to 1.00 wt. % V 0 to 1.60 wt.% Hf 0 to 1.20 wt.% Si 0 to 0.50 wt.% Of other elements in total, of which each other element is at most 0.20 wt.% Balance Ni, but at least 30 wt.%. Chromium-containing alloy according to claim 4, characterized in that it is formed as a steel alloy and has the following composition in percentages by mass: 1.0 to 18.00 wt.% Cr 0 to 4.50 wt.% Cu 0 to 26.00 wt.% Ni 0 to 7.70 wt% Co 0 to 4.50 wt% Mo 0 to 3.50 wt% W 0 to 1.0 wt% V 0 to 2.00 wt% Mn 0 to 0, 65% by weight Nb 0.03 to 1.00% by weight C 0 to 1.2% by weight Si 0 to 2.20% by weight Ti 0 to 2.20% by weight of other elements in total, each of which is different Element at most 0.90% by weight of remainder Fe, but at least 50% by weight. Chromium-containing alloy according to claim 4, characterized in that it is formed as a cobalt-based alloy and has the following composition in percent by mass: 0 to 0.25 wt.% Al 0.1 to 0.7 wt.% C 18.00 to 25.00 wt % Cr 0 to 0.2 wt% Cu 0 to 4.00 wt% Fe 0 to 1.7 wt% Mn 5.00 to 12.00 wt% Ni 0 to 0.50 wt% Si 0 to 3.7% by weight Ta 5.00 to 16.00% by weight W 0 to 0.5% by weight Ti 0 to 0.5% by weight Zr 0 to 2.00% by weight of other elements in total of which any other element is at most 0.50% by weight of Co, but at least 50% by weight. Chromium-containing alloy according to one of claims 4 to 7, characterized in that it is designed as a wrought alloy and / or as a casting alloy. Component for a thermal gas turbine, in particular for an aircraft engine, characterized in that it at least partially consists of a chromium-containing alloy, which is produced by means of a method according to one of claims 1 to 3 and / or formed according to one of claims 4 to 8. A method of assaying an alloy comprising the steps of: providing a specimen made of the alloy ( 10 ); Generating a first sample surface ( 12 ) on the specimen ( 10 ); Rays of the first sample area ( 12 ); Generating a second sample surface ( 16 ) on the specimen ( 10 ), the second sample surface ( 16 ) in the area of the first sample area ( 12 ) and at an angle to the first sample surface ( 12 ) is produced; and Examine at least one area of the second sample area ( 16 ), wherein at least one parameter from the group of inclusions, microstructure and elemental composition in the area of the second test area ( 16 ) is determined. A method according to claim 10, characterized in that the first sample surface ( 12 ) and / or the second sample surface ( 16 ) is produced by a separation process, in particular by grinding and / or polished after your production. Method according to claim 10 or 11, characterized in that the region of the second sample surface ( 16 ) is examined by means of light microscopy and / or scanning electron beam microscopy and / or energy dispersive X-ray spectroscopy. Method according to one of claims 10 to 12, characterized in that the test specimen ( 10 ) before generating the second sample surface ( 16 ) is arranged in a positioning device, by means of which the angle of the second sample surface ( 16 ) opposite the first sample surface ( 12 ) is set. Method according to one of claims 10 to 13, characterized in that at least one inclusion in the structure of the alloy determined and a quantitative elemental analysis of the inclusion is performed. Method according to claim 14, characterized in that a quantitative elemental analysis of an element used in the production of the alloy and / or a master alloy used in the production of the alloy is carried out and identified by comparison with the elemental analysis of the inclusion at least one element used in the production of the alloy which is the cause of inclusion due to a low degree of purity.

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