Abstract
Powder metallurgy superalloy (P/M superalloy) was developed following the development of turbine engine disc, and it was usually characterized the mechanical behavior using rod specimen . Up to mow, P/M superalloy has not only been the primary material of turbine disc but also the main material of thin plate components. It is insufficient only to carry out mechanical property of rod-shaped samples. In this paper, the fatigue performance and surface sensitivity of powder metallurgy alloys of two kinds of powder (AA powder and PREP powder) were studied. Tensile fatigue tests were carried out for studying the changing law of tensile fatigue behaviors using plate-shaped and rod-shaped samples with shot peening and without shot peening. The surface sensibility of plate specimens was also analyzed according to the fatigue behaviors and crack initiation sites.
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