Z.Q. Hu
,
W.R.Sun and S.R. Guo(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China Manuscript received 26 August 1996)
金属学报(英文版)
The effects of the trace elements, P, S and Si,on the solidification, segregation,microstructure and mechanical properties of GH761 and In718 alloys were studied.It was found that the segregation of the P,S and Si can be greatly aggravated or relieved by the precipitation taking place during the solidification. In the heat treated state,P enhances the intergranular precipitation in the GH761 alloy.The refinement of P in In718 alloy causes the appearance of a film-like δphase.Si increases the intergranular precipitation of the M_6C and the Laves Phase in the In718 alloy.P, S and Si play diverse roles in the tensile and the stress rupture properties of the GH761 and In718 alloys. The most striking effect is that P significantly prolongs the stress rupture lives of the GH761 and In718 alloys in a wide range of 0.00050.015 wt% .The mechanisms by which P,S and Si influence the superalloys are discussed in the text.
关键词:
: superalloy
,
null
,
null
,
null
肖素芬
,
陈梦谪
,
王宁
,
董建新
,
谢锡善
金属学报
用透射电子显微镜研究了改型与常规粉末７１８合金长期时效过程中γ″，γ′，δ相的析出、粗化行为．结果表明：改型合金与常规合金中γ″，γ′的析出行为不同，前者γ″和γ′主要以包覆及复合组织析出，后者γ″和γ′则多以单独、分离形式析出．在６５０℃等温１００００ｈ时效过程中，改型合金的γ″粗化速率低于常规合金，表现出良好的稳定性．经过７５０℃，１０００ｈ时效，两种合金均发生δ相的大量析出，但δ相在两个合金中析出的形貌、数量不同．
关键词:
高温合金
,
INCONEL 718
,
long-time aging
