EFFECT OF PHOSPHORUS ON MECHANICAL PROPERTIES OF GH761 ALLOY
YANG Shulin; SUN Wenru; GUO Shouren;WEI Zhigang; YANG Hongcai; HU Zhuangqi
School of Materials & Metallurgy; Northeastern University; Shenyang 110004; Institute of Metal Research; The Chinese Academy of Sciences;Shenyang 110016
Cite this article:
YANG Shulin; SUN Wenru; GUO Shouren; WEI Zhigang; YANG Hongcai; HU Zhuangqi. EFFECT OF PHOSPHORUS ON MECHANICAL PROPERTIES OF GH761 ALLOY. Acta Metall Sin, 2005, 41(12): 1249-1255 .
Abstract When phosphorus content is below 0.040%, no obvious effect on the
tensile properties of GH761 alloy at room temperature and 650℃ was
observed. However, phosphorus influenced the stress rupture properties
of GH761 alloy greatly. The peak value of the rupture life at 650 ℃
and 637 MPa appeared at 0.023% phosphorus. At the point, the life
was longer than 970 h, more than 3 times of that when the phosphorus
content is 0.0007%. Phosphorus can prolong the rupture life of GH761
alloy by inhibiting the dislocation glide, increasing the intergranular
precipitation and blocking the diffusion of oxygen along gain boundaries.
However, excessive addition of phosphorus lowered the grain boundary
strength by deteriorating the grain boundary precipitation and causing the
precipitation of η-Ni3Ti, which shortened the rupture life of GH761 alloy.
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