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Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformatio 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 instabilit did not occur when average power dissipation rate was larger than 50% in the temperature range of 1020e1130 C, corresponding to the strain rate range of 5 10 4e3.2 10 3s 1. The domain is appropriate fo the processing deformation of superalloy GH4742.
Hot compression tests were conducted on a Gleeble-1500D thermal simulating tester. Based on the deformatio 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 It is shown that instabilit did not occur when average power dissipation rate was larger than 50% in the temperature range of 1020e1130 C, corresponding to the strain rate range of 5 10 4e3. 2 10 3s 1. The domain is appropriate fo the processing deformation of superalloy GH4742.