Powder Metallurgy Technology (Selected Articles)
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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This paper studies the effect of various pre-HIP heating, isostatic pressure heat treatment on the size and distribution of prior particle boundary PPB carbide precipitates, volume fraction and grain size of HIP billets of Rene 95 PM powder metallurgy alloy. The possibility of reducing the PPB carbide segregation by using pre-HIP heat treatment was explored. The results show that pre-HIP treatment can reduce the degree of PPB carbide segregation, increase the volume fraction, but leave grain size unchanged. This is due mainly to the improvement of pre-HIP powder surface state and the precipitating environment of carbides on PPB.
- Metallurgy and Metallography