A 0.02%C plain carbon steel and a 0.11%C Nb-modified steel were tested in compression in the austenite temperature range.The critical strains for the initiation of dynamic recrystallization were determined from the 41...A 0.02%C plain carbon steel and a 0.11%C Nb-modified steel were tested in compression in the austenite temperature range.The critical strains for the initiation of dynamic recrystallization were determined from the 41 stress-strain curves obtained,using the double differentiation method.The work hardening behavior up to the critical strain was analyzed with the aid of a dislocation density model and the work hardening parameters r and h were derived in this way.These parameters were used to model the austenite flow curves beyond the critical strain, i.e.in the absence of dynamic recrystallization.The net softening attributable to dynamic recrystallization was defined as the difference between the calculated work hardening curve and the experimental flow curve.The softening data are expressed in the form of Avrami kinetics.Using the dependences of the work hardening parameters and Avrami kinetic parameters on Z,the Zener-Hollomon parameter,it is shown how the flow curves pertaining to industrial rolling conditions can be modeled.展开更多
文摘A 0.02%C plain carbon steel and a 0.11%C Nb-modified steel were tested in compression in the austenite temperature range.The critical strains for the initiation of dynamic recrystallization were determined from the 41 stress-strain curves obtained,using the double differentiation method.The work hardening behavior up to the critical strain was analyzed with the aid of a dislocation density model and the work hardening parameters r and h were derived in this way.These parameters were used to model the austenite flow curves beyond the critical strain, i.e.in the absence of dynamic recrystallization.The net softening attributable to dynamic recrystallization was defined as the difference between the calculated work hardening curve and the experimental flow curve.The softening data are expressed in the form of Avrami kinetics.Using the dependences of the work hardening parameters and Avrami kinetic parameters on Z,the Zener-Hollomon parameter,it is shown how the flow curves pertaining to industrial rolling conditions can be modeled.
