Flow behavior and evolution of microstructure during hot deformation for ahigh Mo stainless steel

The mechanical behaviors of high Mo austenitic stainless steel 00Cr20Ni18Mo 6Cu[N] have been investigated using the methods of hot compression simulati on test on the Thermecmaster-Z simulator. The dynamic recrystallization kin etic equation was established, Avrami coefficient n lies in between 0.9 sim ilar to 2 depending on deformation parameters. A perfect flow stress model considering dynamic recrystallization was also established. Dynamic recryst allization tends to complete at 1050 degrees C and high strain rate, but at temperature below 950 degrees C, it is hard to occur. Double-stage interru pt compression tests were carried out. Activation energy for static and met adynamic recrystallization have been obtained respectively (Q(SRX)=483.7, Q (MDRX)=253.5 kJ/mol). Avrami coefficient of MDRX is about 0.5, and t(0.5)-k inetics equations of SRX and MDRX have also been constructed. The evolution of microstructures during interrupt compression deformation was investigat ed. Static and metadynamic recrystallization is essential to improve plasti city, at temperature above 1000 degrees C increasing interpass time has adv antage for static and metadynamic recrystallization.