A Comparative Study of Various Flow Instability Criteria in Processing Map of Superalloy GH4742  

作　　者：Ge Zhou Hua Ding Furong Cao Beijiang Zhang 

机构地区：[1]College of Materials and Metallurgy, Northeastern University [2]High Temperature Materials Division, Central Iron and Steel Research Institute

出　　处：《Journal of Materials Science & Technology》2014年第3期217-222,共6页材料科学技术（英文版）

基　　金：supported by the National Key Basic Research Program of China (No. 2010CB631203)

摘　　要：Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformation behavior and microstructural evolution of superalloy GH4742, 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 was shown that instability did not occur when average power dissipation rate was larger than 50% in the temperature range of 1020- 1130℃, corresponding to the strain rate range of 5 × 10-4-3.2 × 10-3 s-1. The domain is appropriate for the processing deformation of superalloy GH4742.Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformation behavior and microstructural evolution of superalloy GH4742, 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 was shown that instability did not occur when average power dissipation rate was larger than 50% in the temperature range of 1020- 1130℃, corresponding to the strain rate range of 5 × 10-4-3.2 × 10-3 s-1. The domain is appropriate for the processing deformation of superalloy GH4742.

关 键 词：GH4742 superalloy Hot compression tests Flow instability criterion Processing map 

分 类 号：TG132.33[一般工业技术—材料科学与工程]