Hot deformation behavior and high temperature plastic constitutive equation of LZ50 steel for axle

doi:10.13251/j.issn.0254-6051.2020.10.006

Abstract

Abstract: Taking LZ50 steel for high-speed railway axle as the research object, Gleeble-1500D thermal simulation machine was used to conduct the hot deformation compression experiment at the temperature of 1050-1200 ℃, with the strain rate of 0.01-1 s^-1, and 50% deformation.The true stress-strain curves of LZ50 steel under different process parameters were obtained by experiments.And the plastic constitutive equation of LZ50 steel at high temperature was deduced by Arrhenius hyperbolic sine function.The dynamic recrystallization behavior of LZ50 steel under different thermal deformation conditions was analyzed.The results show that LZ50 steel is sensitive to the changes of temperature and strain rate. With the increase of temperature and the decrease of strain rate, the flow stress decreases.The deformation activation energy of LZ50 steel is 217 920.626 J/mol.The higher the deformation temperature, the lower the strain rate is, and the dynamic recrystallization is more likely to occur.

Key words: LZ50 steel, constitutive equation, hot deformation activation energy, dynamic recrystallization

CLC Number:

Zheng Xiaohua, Bai Yongqing, Jia Xiaobin. Hot deformation behavior and high temperature plastic constitutive equation of LZ50 steel for axle[J]. Heat Treatment of Metals, 2020, 45(10): 31-34.

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