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Flow instability criteria in processing map of superalloy GH79 被引量:4
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作者 周舸 丁桦 +2 位作者 曹富荣 韩寅奔 张北江 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1575-1581,共7页
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,GE... 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. 展开更多
关键词 nickel-based superalloy hot compression flow instability criterion processing map
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A Comparative Study of Various Flow Instability Criteria in Processing Map of Superalloy GH4742 被引量:4
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作者 Ge Zhou Hua Ding +1 位作者 Furong Cao Beijiang Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2014年第3期217-222,共6页
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 Prasa... 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. 展开更多
关键词 GH4742 superalloy Hot compression tests Flow instability criterion Processing map
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