Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Flow instability criteria in processing map of superalloy GH79
ZHOU Ge1, DING Hua1, CAO Fu-rong1, HAN Yin-ben1, ZHANG Bei-jiang2

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. High Temperature Materials Division, Central Iron and Steel Research Institute, Beijing 100081, China

Abstract:Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformation behavior and microstructural evolution of superalloy GH79, different types of instability criteria of PRASAD, GEGEL, MALAS, MURTY and SEMIATIN were compared, and the physical significance of parameters was analyzed. Meanwhile, the processing maps with different instability criteria were obtained. It is shown that instability did not occur when average power dissipation rate was larger than 60% in the temperature range of 900-930 °C and 960-1080 °C, corresponding to the strain rate range of 5×10-4-1.8×10-1 s-1 and 5×10-4-1.5×10-1 s-1, respectively. The two domains are appropriate for the processing deformation of superalloy GH79.


Key words: nickel-based superalloy; hot compression; flow instability criterion; processing map

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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