JPH03191032A - Supporting device for designing of gamma' precipitation strengthened ni-based super alloy - Google Patents

Abstract

PURPOSE:To predict the compsn. of the new Ni-based super alloy having desired characteristics by automatically changing the compsn. and quantity of a gamma' phase, the quantity of C and the quantity of B, respectively, successively calculating the compsns. of the gamma' phase, carbide and boride for each thereof, adding these compsns. and calculating the alloy compsn. CONSTITUTION:The compsn. of the Ni-based super alloy is inputted from an input device 2 to an arithmetic unit 3 which first calculates the compsns. and quantity ratios of the carbide and boride formed in the alloy and subtracts the results thereof from the alloy compsn. to calculate the compsn. of the two-phase region of the gammaphase (solid soln. phase) and gamma' phase (Ni, Al type metallic compd. phase) which are the main constituting layers of the Ni-based super alloy. The respective compsns. and quantity ratios of the gamma phase and gamma' phase which exert a significant influence on the respective alloy characteristics are calculated from the calculated compsn. of the two-phase region by equiv. calculation equation stored in a memory device 1 and thereafter, the other structure factors and characteristics are calculated. The calculated compsn. factors and alloy characteristics are displayed together with the inputted alloy compsn. on a display device 4. The characteristics for the arbitrary alloy compsn. of the Ni-based super alloy are predicted in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to the design of a γ' precipitation-strengthened Ni super-superalloy. More specifically, this invention aims to analyze various alloy properties such as thermal fatigue resistance, high-temperature tensile properties, and high-temperature corrosion resistance of a γ′ precipitation-strengthened Ni super-superalloy, and to develop a new γ′ precipitation-strengthened Ni supersuperalloy that satisfies the required performance. γ′ allows for simple, easy, and efficient search for strengthened Ni super-superalloy alloy compositions.
This invention relates to a precipitation-strengthened Ni-based superalloy design support device.

(Conventional technology and its challenges) γ′ precipitation-strengthened Ni super superalloys have been known as heat-resistant alloys with excellent high-temperature strength, and are used as high-temperature components in heat engines such as jet engines and gas turbines for power generation. It has been widely used. In particular, it is attracting attention as an essential material for the rotor blades of heat engines. It is extremely important for the rotor blade material of a heat engine to have excellent high-temperature strength, and the high-temperature strength of the rotor blade material is a factor that has a great impact on the performance of the heat engine, such as output and efficiency. . In that way,
Various properties such as oxidation resistance, sulfide corrosion resistance, and creep resistance are also required for rotor blade materials. As the momentum toward aerospace technology development increases, there is a strong desire to develop a new γ' precipitation-strengthened Ni super-superalloy that has higher high-temperature strength and also has a well-balanced variety of properties as described above.

However, in the past, it has not always been easy to develop such new alloys.

That is, the constituent elements constituting the γ′ precipitation-strengthened Ni superalloy include -m, in addition to the base Ni, Al
, Co, Cr, Mo, W, Ti.

More than 10 types of elements such as Nb, Ta, and Hf are known, and in order to combine these 10 or more constituent elements to produce alloys with different compositions and verify the properties of all of them, it is necessary to
The problem was that it required a great deal of effort and time, and was virtually impossible. Even if the composition of the above-mentioned constituent metal elements were changed by three steps, the combination would actually be 3 to the 9th power, that is, 19683
It even reaches the street. In actual alloy development, it is necessary to change the composition more precisely than this, and the number of combinations is enormous.

For this reason, it is desired to easily and efficiently optimize the quantity ratio of the phases and the proportions of the constituent elements that make up the alloy, but at present, the only way to eliminate harmful substances is to calculate the summation calculation using electron theory called PHACOMP. There is only a determination technology available, but no definitive strategy for developing new alloys has been found.

This invention was made in view of the above-mentioned circumstances, and eliminates the drawbacks of the conventional γ' precipitation-strengthened Ni super-superalloy development, and improves the creep resistance of the γ'-precipitation-strengthened Ni super-superalloy. Analysis of various alloy properties such as properties, high-temperature tensile properties, and high-temperature corrosion resistance, and the search for new γ′ precipitation-strengthened Ni super-superalloy alloy compositions that meet the required performance can be easily, easily, and efficiently performed. The purpose of this study is to provide support for the design of new γ′ precipitation-strengthened Ni super-superalloys:

(Means for Solving the Problems) The present invention solves the above problems by inputting a storage device having constituent elements of a Ni-based superalloy, a structure factor calculation formula, and an alloy property calculation formula, and an alloy composition. An input device that stores this information in a storage device, a calculation device that calculates a tissue factor from the alloy composition stored in the storage device, and calculates alloy properties from the alloy composition and the calculated tissue factor, and a calculation device that calculates the tissue factor and Provided is a γ' precipitation-strengthened Ni-based superalloy design support device comprising a display device that displays alloy properties together with alloy composition.

In this device, the focused calculations of the composition and distribution ratio of the γ′ phase and the focused calculation of the amount of the γ′ phase are linked, and the γ phase and γ
A preferred embodiment is to provide an arithmetic device for calculating the composition and quantity ratio of each phase.

The present invention also provides a memory device having constituent elements, tissue factors and properties of the Ni-based superalloy, a tissue factor calculation formula and a property calculation formula, and an input for inputting one or more types of required performance and storing the same in the storage device. An arithmetic device that calculates an alloy composition from the required performance stored in a device, a storage device, calculates a composition factor and alloy properties from the calculated alloy composition, and stores these together with the alloy composition in a storage device; The present invention also provides a γ' precipitation-strengthened Ni-base superalloy design support device characterized by comprising a display device that displays a list of calculated alloy compositions, microstructure factors, and alloy properties.

In this device, the composition and amount of the γ' phase, the amounts of C2B and Zr are automatically changed, and for each of them, the γ phase,
A preferred embodiment includes an arithmetic device that sequentially calculates the compositions of carbides and bolides and then adds them together to calculate the alloy composition.

(Function) In the γ′ precipitation-strengthened Ni-based superalloy design support device of the present invention, when the alloy composition is input, a focused calculation is performed using the equilibrium formula 31 for the γ phase and the γ′ phase, and the γ phase and Calculate the composition and quantity ratio of each γ′ phase, and automatically calculate the structural factors such as phase stability, lattice constant, specific gravity, initial melting temperature of single crystal material, and complete solution temperature of γ′ phase. I can do it. In addition, various alloy properties such as creep rupture life, high-temperature tensile properties, and high-temperature corrosion resistance are automatically calculated using a property calculation formula from the input alloy composition and the calculated microstructure factor. , the calculated composition factor and alloy properties can be displayed.

In addition, 1 selected from alloy properties and/or microstructural factors
11! When the above required performance is input, the composition and amount of the γ' phase, C, B, and Zri are automatically changed, and the composition of the γ phase, carbide, and boride is sequentially changed for each of them.
can be calculated and then added together to automatically calculate the alloy composition. Furthermore, the calculation of the texture factor and alloy properties based on the calculated alloy composition is automatically performed, and a list of the calculated alloy composition, texture factor, and alloy properties can be displayed.

Alloy analysis by calculating alloy properties and alloy search by calculating alloy composition can be simulated via a display device.

(Example) Hereinafter, the γ' precipitation-strengthened Ni-based superalloy design support device of the present invention will be described in more detail by showing examples along with the drawings.

FIG. 1 is a block diagram illustrating an example of the configuration of a γ' precipitation-strengthened Ni-based superalloy design support system of the present invention.

In the γ' precipitation-strengthened Ni-based superalloy design support device of the present invention, Ni, Co, C7, Mo, and W.

Al, Tj, Nb, Ta, Hf, Re, Fe, C.

Enter the memory device (1) that stores the constituent elements, tissue factor calculation formula, and property calculation formula of the N1-based superalloy of B and Zr, the alloy composition, or one or more required performances, and
an input device (2) stored in the input device (2) stored in the storage device (1);
An operation having a search operation unit that calculates the alloy composition from the required performance stored in the storage device (1), calculates the composition factor and characteristics from the calculated alloy composition, and stores these together with the alloy composition in the storage device. The apparatus (3) and the input alloy composition with the tissue factor and properties calculated by the analytical calculation unit of the calculation unit (3), or the alloy composition, tissue factor and alloy properties calculated by the search calculation unit of the calculation unit (3). It has the configuration of a display device (4) that displays a list.

Table 1 shows examples of typical structural factors and properties that can be input and calculated by the design support system for this Ni-based superalloy.

Table 1 FIG. 2 is a flowchart illustrating the system of the design support apparatus illustrated in FIG. 1.

As shown in this example, the N1-base superalloy design support system of the present invention automatically calculates and outputs the composition factors and properties of the alloy from the input alloy composition.
5) and a search system (6) that automatically searches for and outputs an alloy composition that satisfies the input required characteristics. Depending on the purpose of use, analysis system (5) or exploration system (6)
It is possible to select one of them and derive the desired calculation result. Such selection of the analysis system (5) or the search system (6) can be performed using the input device (2).

Next, the analysis of alloy properties and the search for alloy composition by this Ni-based superalloy design support system will be explained.

Analysis of Alloy Properties> When the alloy composition is input using the input device (2), the calculation device (3) first calculates the composition and quantitative ratio of carbides and borides.

When used as a polycrystalline material for Ni-based superalloys, C and B are usually added as grain boundary strengthening elements. These C and B exist mainly in the grain boundaries of the Ni-based superalloy as carbides and borides, respectively. Carbide has
There are three types of MC type, M23C6 type, M, and C type (M: metal element), and two types of borides are M, B2 type, M, B, type (M
: Metallic element) exists.

Therefore, the composition and quantitative ratio of carbides and borides generated in the alloy are calculated from the input alloy composition, and this is subtracted from the alloy composition.
The composition of the two-phase region of solid solution phase) and γ' phase (N i s Al type metal compound phase) is calculated. Note that in the case of using a single crystal material of Ni-based superalloy, the composition values of C and B can be input as O. All of the calculation formulas for the composition and quantitative ratio of carbides and borides, and the composition of the two-phase region of γ phase and γ' phase are stored in the storage device (1).

Next, from the calculated composition of the two-phase region of γ phase and γ′ phase,
The composition and quantity ratio of each of the γ phase and γ' phase, which have a large influence on alloy properties, are calculated based on the equilibrium calculation formula stored in the storage device (1). This equilibrium calculation formula includes the hyperplane formula in which the composition of the γ′ phase that is in equilibrium with the γ phase exists, that is, γ
’ plane, element concentration in the γ phase of element i, and γ′ of element i
Ratio of concentrations in the phases (i is Co, Cr, Mo, W, AI.

'T''i, Nb, T'a, Hf, Re and Fe) is used.

The formula for the γ' plane and the formula for the distribution ratio are each created based on analysis data obtained by multiple regression analysis of existing Ni-based superalloys.

The equation for the γ' plane is shown as a function of the concentration of the constituent elements in the γ' phase as shown in the following equation:

AI concentration in γ′ phase f (Co, Cr, Mo, W, Ti in r' phase.

Concentrations of Nb, Ta, Hf, Re and Fe (at%))
...■ Moreover, the formula for the distribution ratio is also shown as a function of the concentration of the constituent elements in the γ' phase, as shown in the following formula 0.

i element distribution ratio = Co, Cr, Mo, W, AI in the g+Cr' phase.

Ti, Nb, Ta, Hf, Re and Concentration of Fe (at%))...■ However, i is Co, Cr, Mo, W, and AI.

Indicates Ti, Nb, Ta, Hf, Re and Fe.

Using these equations (1) and 0, iterative convergence calculations are performed based on the system flow shown in FIG. 3, and the compositions and quantity ratios of each of the γ phase and γ' phase are calculated.

As illustrated in FIG. 3, the arithmetic unit (3) includes a loop (7) for convergent calculation of the composition of the γ' phase and the distribution ratio from the initial values of the γ' phase amount and the distribution ratio; Another loop (8) is provided to perform the convergence calculation of the quantity, and these loops (
7) The iterative convergence calculations in (8) are also performed in conjunction. Through this double iterative convergence calculation, highly accurate compositions and quantity ratios of the γ phase and γ' phase can be obtained. Please note that harmful phases may be generated from the input alloy composition, or γ
If the phase becomes a single phase and the γ' phase is desired to precipitate, the first
A message to that effect is displayed on the display device (4) shown in the figure. In this case, re-enter the alloy composition and re-input the γ phase and γ phase.
The composition and quantity ratio of each of the 'phases can be calculated.

After calculating the composition and quantity ratio of each of the γ phase and γ′ phase,
Calculation of other tissue factors and properties as exemplified in Table 1 is performed. All of the tissue factor calculation formula and property calculation formula are also stored in the storage device (1).

One of the features of the Ni-based superalloy design support device of the present invention is that the alloy property calculation formula is determined by multiple regression analysis of existing data and is made into a function of the alloy composition and fiber assembly factor. This allows the calculation device (3) to calculate various alloy properties as exemplified in Table 1.

The calculated composition factors and alloy properties are displayed on the display device (4) together with the input alloy composition.

Next, an example in which alloy properties were analyzed using the Ni-based superalloy design support apparatus of the present invention will be described.

The composition of Tadagoe TMS-12 alloy was input, and the equilibrium state at 900°C and various high-temperature properties were calculated. FIG. 4 is a screen diagram showing the results. The meanings of the abbreviations shown in FIG. 4 are as shown in Table 2.

Table 2 Wood lattice misfit ('A) [(ar'-ar)/ay] x 100h Predicted values of composition factors such as γ phase and composition of γ phase and various properties as shown in the screenshot in Figure 4 was in good agreement with the measured value of TMS-12 alloy. Also, the calculation time at this time is approximately 2
It was about seconds. It was confirmed that it is possible to analyze alloy properties at high speed and with high accuracy.

Search for Alloy Composition> As shown in the flowchart illustrated in FIG. 2, when searching for the composition of a new alloy having desired characteristics, select the search system (6) with the input device (2), Enter the required performance. As the required performance, one or more arbitrary ones can be selected from the alloy properties exemplified in Table 1. Furthermore, one or more types of tissue factors can be selected as needed and added as required performance.

When the required performance is input using the input device (2), the γ' phase composition, γ' phase amount, C1B and ZrJL are automatically changed in small increments in the arithmetic unit (3), and each of them is changed as shown below. calculations are performed automatically.

First, calculate the distribution ratio from the γ′ phase composition using the distribution ratio formula described above, and calculate the γ phase composition parallel to the γ′ phase6.
Next, the (γ+γ') composition is calculated from the γ' phase composition, the γ' phase amount, and the calculated γ phase composition, and the composition and amount ratio of carbides and borides that are in equilibrium with this are calculated. After this, the alloy composition is calculated by adding the (γ1γ') composition and the carbide and boride compositions.

In this way, all alloy compositions are explored.

In the Ni-based superalloy design support device of the present invention, as described above, the γ' phase composition, γ' phase amount, C1B and Zr
Another feature is that the γ phase, carbides, and borides are sequentially calculated by changing and setting the amounts, and finally, the alloy composition is calculated by adding these together. By doing so, it is possible to accurately calculate the alloy composition by finely changing the composition, and since there is no need to find a solution, the calculation time can be significantly shortened.

After calculating the alloy composition, the structure factors and properties for the composition are calculated in the same manner as in the analysis system (5) described above. Next, these values are compared with the input required performance, and if the required performance is satisfied, ranking is performed as necessary, and the calculated alloy composition, tissue factor, and properties are stored in the storage device (1). together with their alloy composition,
A list of tissue factors and properties is displayed on the display device (4).

On the other hand, if it is desired to satisfy the required performance, the process returns to changing and setting the γ' phase composition, γ' phase amount, C, B, and Zr amounts, and the calculation of the alloy composition is repeated.

Note that if an alloy composition that satisfies the required performance is desired to exist, a message to that effect is displayed on the display device. All of the above processes are also performed automatically. The calculation time varies depending on the step size of the γ' phase composition, but for boat fishing, it can be about 30 minutes.

Next, an example of searching for an alloy composition using the Ni-based superalloy design support apparatus of the present invention will be described.

Search example 1 As the required performance, creep rupture life (test condition = 104
The Co
.

Alloy searches were conducted for all combinations of Ni-based alloys consisting of 10 elements: Cr, Mo, W, Al, Ti, Nb, Ta, and Hf.

The search was completed after about 30 minutes, and a series of alloy compositions, tissue factors, and properties that satisfied the above required performance were output. Among them, the one with the longest creep rupture life is TM
S-64 alloy (Cr6.5%.

Mo8.4%, Wl, 0%, AI5.8% Ta6.7
% balance Ni), and its creep rupture life was 7080 hours.

This alloy was actually melted to create a single crystal specimen,
After solution treatment in the predicted γ' solution temperature range, normal aging treatment was performed and the properties were measured and compared with design values.

Figure 5 shows the results together with the characteristics of the practical alloy and the previously developed alloy.

As is clear from FIG. 5, it was confirmed that the design value of TMS-64 alloy is very similar to the actual value, although it is slightly longer. Furthermore, actual measurements showed that the creep rupture life was longer and the specific gravity was lower than that of practical alloys as well as existing alloys under development. It has been demonstrated that it is possible to support the design of new alloys.

We searched for an alloy with the longest creep rupture life by limiting the specific gravity to 8.1 or less. As a result, the creep rupture life is 1
755 hours TMS-61 alloy (Cr.

N1-based alloy containing Mo, Al, Ti, Nb and Ta)
was calculated.

This alloy was actually melted in the same manner as in Exploration Example 1, a single crystal specimen was prepared, and after solution treatment in the predicted γ solid solution temperature range, a normal aging treatment was performed to determine the properties. Measured and compared with design value. This result is also shown in FIG.

Similar to the TMS-64 alloy of Search Example 1, it was confirmed that the design value of the TM361 alloy was slightly longer than the measured value, but very similar. Furthermore, actual measurements of this alloy showed that it had a longer creep rupture life and lower specific gravity compared to practical alloys and existing alloys under development.

Of course, this invention is not limited to the above examples, but various embodiments are possible with respect to details such as the 0-tissue factor and the type of properties, the input alloy composition and required performance, and the calculation time on the arithmetic device. Needless to say.

(Effects of the Invention) As explained in detail above, the present invention makes it possible to predict the properties of a Ni-based superalloy for any alloy composition. Furthermore, it is possible to efficiently search for a new γ' phase precipitation-strengthened Ni-based superalloy that satisfies desired properties.

Analysis and exploration of Ni-based superalloys becomes simple and easy, and the efficiency of alloy development is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an example of the configuration of a γ' precipitation-strengthened Ni-based superalloy design support system of the present invention. FIG. 2 is a flowchart illustrating the system of the design support apparatus illustrated in FIG. FIG. 3 is a flowchart showing a partial example of the system of the analysis calculation section of the calculation device that calculates the composition and quantitative ratio of each of the γ phase and γ' phase. FIG. 4 is a screen diagram illustrating the equilibrium state at 900° C. and various high-temperature properties of the TMS12 alloy calculated by the apparatus of the present invention. FIG. 5 is a correlation diagram showing the properties of the alloy designed using the apparatus of the present invention together with the measured values and the properties of conventional practical alloys and existing developed alloys. 1...Storage device 2...Input device 3...Arithmetic device 4...Display device 5...Analysis system 6...Search system

Claims (13)

[Claims] (1) A memory device that has the constituent elements, tissue factor calculation formula, and property calculation formula of the Ni-based superalloy, an input device that inputs the alloy composition and stores it in the memory device, and a microstructure factor from the alloy composition stored in the storage device. A γ′ precipitation strengthened type characterized by comprising a calculation device that calculates properties from the alloy composition and the calculated texture factor, and a display device that displays the texture factor and properties calculated by the calculation device together with the alloy composition. Ni-based superalloy design support equipment. (2) The constituent elements stored in the storage device are Ni, Co, and Cr.
, Mo, W, Al, Ti, Nb, Ta, Hf, Re, F
γ' according to claim (1), which is e, C, B and Zr.
Precipitation-strengthened Ni-based superalloy design support equipment. (3) The γ' precipitation-strengthened Ni-based superalloy design support system according to claim 1, wherein the structure factor calculation formula stored in the storage device includes at least an equilibrium calculation formula for the γ phase and the γ' phase. (4) The γ′ precipitation-strengthened N according to claim 3, wherein the equilibrium calculation formula for the γ phase and the γ′ phase consists of a γ′ plane equation and a distribution ratio equation.
i-based superalloy design support equipment. (5) The γ' precipitation-strengthened Ni-based superalloy design support system according to claim (1), wherein the characteristic calculation formula stored in the storage device is expressed as a function of alloy composition and texture factor. (6) Iterative focused calculation of the composition and distribution ratio of the γ′ phase and γ′
The γ' precipitation-strengthened Ni-based superalloy according to claim 1, further comprising an arithmetic device that calculates the composition and quantity ratio of each of the γ phase and the γ' phase by interlocking repeated focused calculations of phase amounts. Design support equipment. (7) A storage device having the constituent elements, tissue factors and properties of the Ni-based superalloy, as well as the tissue factor calculation formula and the property calculation formula;
An input device that inputs one or more types of required performance and stores it in a storage device, calculates an alloy composition from the required performance stored in the storage device, and calculates a tissue factor and properties from the calculated alloy composition. γ' precipitation-strengthened Ni-based superalloy design support comprising: a calculation device that stores the alloy composition along with the alloy composition in a storage device; and a display device that displays a list of the alloy composition, microstructure factors, and properties calculated by the calculation device. Device. (8) The constituent elements stored in the storage device are Ni, Co, and Cr.
, Mo, W, Al, Ti, Nb, Ta, Hf, Re, F
8. The γ' precipitation-strengthened Ni-based superalloy design support device according to claim 7, wherein the γ′ precipitation-strengthened Ni-based superalloys are e, C, B, and Zr. (9) The γ' precipitation-strengthened Ni-based superalloy design support system according to claim 7, wherein the structure factor calculation formula stored in the storage device includes at least an equilibrium calculation formula for the γ phase and the γ' phase. (10) The γ' precipitation-strengthened Ni-base superalloy design support device according to claim 9, wherein the equilibrium calculation formula for the γ phase and the γ' phase comprises a γ' plane formula and a distribution ratio formula. (11) The γ' precipitation-strengthened Ni-based superalloy design support system according to claim (7), wherein the characteristic calculation formula stored in the storage device is expressed as a function of alloy composition and texture factor. (12) The γ' precipitation-strengthened Ni-based superalloy design support device according to claim (7), wherein the required performance is one or more selected from properties and/or microstructural factors. (13) Automatically change the composition and amount of the γ′ phase and the amounts of C, B, and Zr, and calculate the γ phase, carbide, and boride compositions for each of them in turn, and then add them together. 8. The γ' precipitation-strengthened Ni-based superalloy design support device according to claim 7, further comprising a calculation device for calculating the alloy composition.