GH220合金的基本組織

倪克銓; 孫金貴; 葛占英; 許慶芳; 俞同豐

doi:10.13374/j.issn1001-053x.1986.s1.002

GH220合金的基本組織

Basic Structure of A Ni-base Superalloy GH220

摘要

摘要: GH220合金正常熱處理組織有γ基體。γ′、MC、M₆C和M₃B₂相。第一階段晶粒長大溫度1150℃—1170℃,第二階段為1210℃。碳化物相M₆C最大析出峰在1000℃左右,并發現不同成分的二種M₆C相。
正常熱處理得不到大小二種γ′,等溫彎晶熱處理能得到大小γ′和彎曲晶界組織。
長期時效,低W、Mo、Al、Ti（17.61％）合金析出M₂₃C₆相。當W+Mo大于12％（如12.31％）正常熱處理會析出少量μ相;等于12％時,時效后才出現μ相。
合金中加入微量元素Mg可改變碳化物形狀,使之細化。

Abstract: The structures of standard heat treatment of the alloy have the phases of gamma, gamma prime, MC,M₆C and M₃B₂.
The first temperature rang of grain growth is about 1150-1170℃. The second is 1210℃. The maximum precipitation peak of main carbide phase M₆C is about 1000℃, and two kinds of M₆C differentiated between in compositions has been found in the tested alloys.
The standard heat trearment of the alloy do not get two kinds of gamma prime phase in size, but the isothermal treatment can get two kinds of gamma prime phase and zigzag grain boundary. The phase of M₂₃C₆ after ageing for a long time can be precipitated in the alloy which has low content of Mo, W, Al and Ti, If the content of W,Mo is greater than 12% （e.g 12.31%）, a few Mu phases can be precipitated.
The carbide can be changed in shape and fined in size,when the magnesinm is added to alloy.

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