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Effect of hot-deformation parameters of alloy In71 8 on the flow stress in the hammer forming process was analyzed in detail via axial compression testing of cylindrical specimens. All tests were conducted at a constant strain rate of 10s-'. The total strain of 0.7 was obtained by three consecutive passes or five. The deformation temperature ranged from 960°C to 1040°C. The interval time was 5s between any two consecutive passes. The complex multi-pass true stressstrain curves in the hammer forging process were reasonably simplified according to the unloading point of every pass, and the continuous stress-strain curves were obtained. The continuous simplified stress-strain curves approximately reflected the changing trends of multi-pass stress-strain curves. These continuous and simplified curves were described quantitatively in mathematics, and then constitutive equation reflecting the relationship between the flow stress and hot-deformation parameters was set up successfully. Superoilo>s 718. 675. 706 and Various Dzrivati~es Edited h! E..4. Loria TLIS (The hlinerals. illetnli cYr Materials Socie t~ ). 2001

Study on Constitutive Equation of Alloy IN718 in Hammer Forging Process