Hot deformation behaviors of Fe-30Mn-3Si-3Al TWIP steel during compression at elevated temperature and strain rate
The hot deformation behaviors of Twining Induced Plasticity (TWIP) steel were investigated at the temperature from 973K to 1373K and strain rates from 0.01s -1 to 20s -1 by the hot compression experiment preformed on Gleeble-3800 thermo-simulation test system. Meanwhile, the microstructural evolutions during recrystallization in hot deformed TWIP steels are investigated by metallurgical analysis. The results show that the flow stress of TWIP steel is greatly influenced by deformation temperature and strain rate, the flow stress increases with the decrease of temperature and the increase of strain rate. The hot flow behaviors of TWIP steel could be represented by Zener-Hollomon parameter in the hyperbolic sine equation, the constitutive equation of hot deformation for TWIP steel were constructed and the hot deformation activation energy is 436.813kJ/mol. The experimental result could be used for analysis of problems in the hot working of TWIP steel. he temperature and strain rate both significantly affect the microstructure of hot deformation TWIP steel. The temperature is higher, the dynamic recrystallization degree is more sufficient; and the strain rate is lager, the dynamic recrystallization grains are finer. Because of high, the deformation mechanism of TWIP steel transform from twinning to dislocation glide, and no deformaton twins forming in the microstructure of hot deformation TWIP steels.The proper technology conditions of TWIP steel under hot work are in a range of temperature from 1223 to 1323K and strain rate from 1 s -1 to 10s -1 , respectively.
Li DaZhao
国际会议
桂林
英文
1-7
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）