CN103131964B - Method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel - Google Patents
Method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel Download PDFInfo
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Abstract
The invention discloses a method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel, which comprises the following steps: configuring an alloy, preheating a casting mold, heating the alloy, performing superheating treatment on the alloy liquid, and casting the alloy, thus obtaining a stainless steel cast ingot which is homogeneous and fine in structure. According to the method disclosed by the invention, the as-cast structure homogeneity of stainless steel can be greatly improved, the equiaxed crystal zone proportion is increased, and grains are refined, thereby being beneficial to enhance the comprehensive mechanical property of X12CrMoWVNbN10-1-1 martensitic stainless steel. The process disclosed by the invention is simple, and the as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel can be effectively controlled by simply optimizing casting process parameters; and the process is easy to operate and control, and is suitable for industrial production.
Description
Technical field
The present invention relates to a kind of inhomogeneity method of the X12CrMoWVNbNl0-1-1 of improvement Martensite Stainless Steel as-cast structure, relate in particular to a kind of raising X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure proportion of equiaxed grain, crystal grain thinning, improve the inhomogeneity method of as-cast structure; Belong to ingot casting casting technique field.
Background technology
X12CrMoWVNbN10-1-1 Martensite Stainless Steel, owing to having good corrosion resistance nature, hot strength and creep-resistant property, is widely used on Nuclear power plants and power station, ore deposit generating rotor material, and its chemical composition is as shown in table 1.Domestic used X12CrMoWVNbN10-1-1 nuclear power rotor steel almost all relies on import at present, therefore produces the tiny ingot casting of homogeneous microstructure very urgent.
Table 1.X12CrMoWVNbN10-1-1 Martensite Stainless Steel chemical composition (wt%)
The inhomogeneity method of raising as-cast structure of generally using in industrial production mainly contains two kinds: method of chemical treatment (breed and go bad) and Physical (applying mechanical vibration, electric and magnetic oscillation, ultrasonic vibration etc.).Yet, fact proved, although chemical method and Physical can refinement ingot structures, all to there is certain limitation.Method of chemical treatment fining agent complicated process of preparation for example, thus cause production cost to improve, and easily mother alloy is polluted to (especially composition being required to strict alloy system).Physical is to equipment requirements is too high and effect is limited.
Therefore, those skilled in the art be devoted to develop a kind of with low cost, simply improve the inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of technique and simply improves the inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
For achieving the above object, the invention provides a kind of inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure, method of the present invention is upper as-cast structure proportion of equiaxed grain, the crystal grain thinning of improving largely, thereby improves the comprehensive mechanical property of ingot casting.
The concrete steps of the inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure of the present invention comprise:
1, configuration alloy
According to the composition of alloy, require configuration alloy raw material: taking respectively carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel is alloy raw material; Due to easy scaling loss of element such as Elements C, Cr, Mn in alloy, therefore these elements are all by the upper limit configuration of the requirement of alloying constituent shown in table 1, preferably, in alloy raw material, the ratio of C, N, Mn, Cr, Ni, Mo, W, V, Nb is 13:6:50:1060:80:110:100:20:5;
2, preheating casting mold
Casting mold is carried out to preheating, and its preheating temperature is 750 ℃～900 ℃;
3, add thermalloy and alloy liquid carries out Overheating Treatment
Adopt medium-frequency induction furnace alloy to heat, after alloy melting, alloy liquid carries out Overheating Treatment, and alloy superheat temperature is controlled between 1600 ℃～1650 ℃, between overheated time 3～10min;
4, cast alloys
After alloy melt Overheating Treatment finishes, stop immediately heating, make aluminium alloy cooling rapidly, when alloy temperature drops to 1580 ℃～1610 ℃, cast, can obtain the tiny ingot casting of homogeneous microstructure.
In better embodiment of the present invention, in alloy, 13:1060:110 is compared in the configuration of Elements C, Cr, Mn.
In another better embodiment of the present invention, for degasification, anti-oxidation, whole process is all to carry out in a vacuum.Especially molten alloy alloy liquid step 3) carry out Overheating Treatment process and all under 30～100Pa, carry out.
Method tool of the present invention has the following advantages:
The inhomogeneity method of the X12CrMoWVNbN10-1-1 of improvement Martensite Stainless Steel as-cast structure of the present invention can be improved X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure homogeneity largely, especially can above improve largely proportion of equiaxed grain, crystal grain thinning.Method of the present invention is simple, only needs to optimize casting technological parameter (melt overheat temperature, casting mold preheating temperature, pouring temperature), can realize the inhomogeneity effective control of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.Adopt processing method of the present invention, can increase largely equiax crystal regional percentage in as-cast structure, thereby obtain the tiny Stainless Steel Alloy ingot casting of homogeneous microstructure, be conducive to improve the comprehensive mechanical property of X12CrMoWVNbN10-1-1 Martensite Stainless Steel.Technique of the present invention is simple, is easy to control, and is suitable for industrialized popularization and use.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the X12CrMoWVNbN10-1-1 Martensite Stainless Steel as cast condition macrostructure that embodiments of the invention 1 obtain;
Fig. 2 is the X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast microstructure that embodiments of the invention 1 obtain.
Embodiment
The inhomogeneity method of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure upper proportion of equiaxed grain, the crystal grain thinning of improving largely that improve of the present invention.In the specific embodiment of the present invention, described method only need determine casting process parameter (melt overheat temperature, casting mold preheating temperature, pouring temperature), can realize the inhomogeneity effective control of X12CrMoWVNbN10-1-1 Martensite Stainless Steel as-cast structure.
In specific embodiments of the invention, the medium-frequency induction furnace using is the conventional instrument in this area, and the present invention is not particularly limited this.
Embodiment 1
1, configuration alloy
The raw material of configuration alloy is: carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel, wherein, in alloy, the ratio of Elements C, N, Mn, Cr, Ni, Mo, W, V, Nb is 13:6:50:1060:80:110:100:20:5, and the gross weight of alloy is 10Kg;
2, casting mold is carried out to preheating
Casting mold be take 400 objects industry magnesia and silicon sol and is made into as raw material, and mould dimension is φ 100mm * 200mm, casting mold is put into resistance furnace and carry out preheating, and preheating temperature is set as 800 ℃;
3, add thermalloy and alloy solution carries out Overheating Treatment
Utilize medium-frequency induction furnace alloy to heat, until after alloy melting, alloy liquid carries out Overheating Treatment, temperature of superheat is 1630 ℃, and the overheated time is 5min.
4, cast alloys
After aluminium alloy Melt Overheating Treatment finishes, close medium-frequency induction furnace, make alloy cooling rapidly, when dropping to 1600 ℃, alloy temperature casts, obtain the tiny ingot casting of homogeneous microstructure, as shown in Figure 1, as-cast microstructure as shown in Figure 2 in the as cast condition macrostructure of this X12CrMoWVNbN10-1-1 Martensite Stainless Steel ingot casting.
5, ingot casting detects
The ingot casting making is taken out, along diameter, longitudinally cut open, with sand paper, by after surface grinding, with chloroazotic acid, corrode.After testing, in ingot macrostructure, remove feeder position, all the other are all equiax crystal district, and equiax crystal district has surpassed 60% of whole ingot casting volume, and equiax crystal diameter is less than 1.100m.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area just can design according to the present invention be made many modifications and variations without creative work.Therefore, all technician in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. improve the inhomogeneity method of X12CrMoWVNbNl0-1-1 Martensite Stainless Steel as-cast structure, it is characterized in that, comprise the steps:
Step 1) configuration alloy
Take carbon dust, extra low carbon ferrochromium, nitrided ferro-chromium, ferro-niobium, ferrotungsten, molybdenum-iron, vanadium iron, ferromanganese and pure nickel respectively as alloy raw material, according to X12CrMoWVNbNl0-1-1 alloying constituent, require described each alloy raw material of configuration;
Step 2) preheating casting mold
Adopt sand mo(u)ld to be casting mold and it is carried out to preheating, described preheating temperature is 750 ℃～900 ℃;
Step 3) add thermalloy and alloy liquid carries out Overheating Treatment
Alloy heats, and after its fusing, alloy liquid carries out Overheating Treatment again, and alloy superheat temperature is 1600 ℃～1650 ℃, overheated time 3～10min;
Step 4) cast alloys
After described alloy melt Overheating Treatment finishes, stop immediately heating, cooling described aluminium alloy is cast when temperature drops to 1580 ℃～1610 ℃ rapidly, obtains the tiny ingot casting of homogeneous microstructure.
2. molten alloy alloy liquid the method for claim 1, wherein step 3) carry out Overheating Treatment process and all under 30～100Pa, carry out.
3., while the method for claim 1, wherein configuring each raw material, in described alloy, the mass ratio of C, N, Mn, Cr, Ni, Mo, W, V, Nb is 13:6:50:1060:80:110:100:20:5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1388266A (en) * | 2002-03-19 | 2003-01-01 | 上海交通大学 | Parallel integrated melt hot treating process and test method |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1388266A (en) * | 2002-03-19 | 2003-01-01 | 上海交通大学 | Parallel integrated melt hot treating process and test method |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
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| JP昭58-217664A 1983.12.17 * |
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