HOT DEFORMATION BEHAVIOR OF GH761 WROUGHT Ni BASE SUPERALLOY
GH761变形高温合金的热变形行为

The flow stress-strain behavior of GH761 alloy was investigated via hot compression testing. The peak stress σp, starting steady--state stress σs, and corresponding strain εp, εs decrease with decreasing strain rate ε at constant temperature. At constant strain rate, σp, σs and εs drop with rising temperature, but εp does not change obviously. On the basis of reducing original grain size, lowering deformed temperature and enhancing strain rate can well refine structure. The microstructure will be most homogenous and finest when the strain reaches the level that DRX is finished exactly. Further increasing the strain will promote the grain growth. The hot deformation constitutive equation obtained is as follows: ε=6.5×106σp4.86exp(-461×103/RT).