Abstract
The mechanical properties of powder Ni-base superalloy consolidated by HIP were obtained for AF 115, MERL76 and Mod. IN100, where the influence of powder handling atmosphere upon the low cycle fatigue life of the consolidated materials was investigated in order to establish the powder consolidation process. Moreover, the differences of mechanical properties between HIPed material and conventional casted one were examined. The results obtained are as follows :
1) In order to get a confidence of low cycle fatigue life, the powders should be handled in the protected atmosphere such as Ar gas or vacuum.
2) Powder consolidation process making use of HIP equipment was established and made it possible for the HIPed materials to possess the satisfactory mechanical properties.
3) Low cycle fatigue life and tensile properties of HIPed materials are much superior to those of conventionally casted ones. This is due to the nature of homogeneity and fine crystal structure of powder materials.
The stress rupture strength of the powder materials is, however, lower especially in the low stress region than that of casted one. This difference between them may be due to the crystal grain size.
