Abstract: The hot flow behavior and processing maps of hot isostatic pressed powder metallurgy FGH4096 superalloy were studied at the temperature range of 1 020—1 140 ℃ and strain rate range of 0.001—10 s-1. The flow stress decrease after the rapid peak strain points and then smoothly transfer to the steady state during the strain rates of 0.001—1.0 s-1. As for the strain rate of 10 s-1, it demonstrates no steady state and the curves drop down sharply, which corresponds with the cracks of specimens. It is found that the flow stresses increase with decreasing deformation temperature and increasing strain rate. Especially when strain rate is above 1.0 s-1, there are double summits of the flow stresses which are resulted in the slip system and dislocation transition at high stain rates. The processing maps with true strain 0.3 exhibit two peak positions of energy dissipation rate: (1) 1 040 ℃, 0.002 s-1, with an efficiency of 62%; (2)1 120 ℃, 0.001 s-1, with an efficiency of 53%. Plasti-city instability is anticipated while the strain rate is above 0.2 s-1 and the temperature range is 1 050—1 105 ℃ at true strain 0.4.
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2020, Vol. 34 
