Method for realizing fine crystal solidification by controlling spherical crystal stabilization

A fine-grain and spherulite technology, applied in the field of superalloy ingot or casting manufacturing, can solve the problems of uneven distribution of carbides and second phases, coarse grains in the columnar crystal region, and sensitivity to blanking deformation, etc. The effect of blanking success rate, microscopic shrinkage and microsegregation is small
CN103131980BInactive Publication Date: 2015-01-28NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2015-01-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for realizing fine crystal solidification by controlling spherical crystal stabilization. A method of combining oxide crucible, glass purifying, circulating and overheating, medium-frequency electromagnetic induction is adopted under vacuum environment, so that melt which is circulated and overheated by multiple times is slowly cooled to the liquid-phase line temperature. Temperature-equalizing and stirring are carried out by utilizing electromagnetic fields, so that temperature and solute of the whole melt are almost uniformly distributed, wherein the whole melt is enabled to be uniformly cooled integrally during the cooling process. According to the method disclosed by the invention, high-temperature alloy fine-grained structure, which is free of a tricrystal region of the conventional solidified ingot, small in microporosity, provided with fine equiaxed grains with grain size level of about ASTM (American Society for Testing Material) 5 level, small in microsegregation and high in density, can be obtained by the method disclosed by the invention. The grain size of the obtained fully equiaxed ingot is close to that of the spherical crystal and is very beneficial to the subsequent deformation, therefore, the billeting success rate of the high-temperature alloy is effectively improved.
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Description

technical field

[0001] The invention relates to the field of metal solidification manufacturing, in particular to a method for realizing fine-grain solidification by controlling the stabilization of spherulites, which is applicable to high-temperature alloy ingots or castings whose crystallization temperature range is greater than 10°C and does not react or reacts weakly with ceramic crucibles manufacture. Background technique

[0002] The traditional high-temperature alloy ingots obtained by ordinary smelting methods have obvious three-crystal regions, and the grains in the columnar crystal regions are coarse, the carbides and the second phase are unevenly distributed, and the micro-segregation is serious. Warp sensitive. For this reason, it is usually necessary to homogenize the solidified ingot for a long time. The superalloy fine-grain casting method obtains fully equiaxed crystal ingots, and the refined equiaxed grains can significantly improve the forging power of hi...

Claims

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