Thermal deformation behavior of a low carbon hot-rolled H-beam steel containing niobium

doi:10.13251/j.issn.0254-6051.2021.05.019

Abstract

Abstract: Thermal deformation behavior at temperature between 1000-1200 ℃ with strain rate of 0.1-5 s^-1 of a new low-carbon hot-rolled H-beam steel containing niobium was studied by means of hot compression experiment and microstructure analysis. The microstructure of the tested steel affected by deformation parameters was analyzed. At the same time, an improved constitutive equation of coupled strain factor was established, and the critical strain model with critical ratio was adopted to predict the critical strain value for dynamic recrystallization. The results show that the original austenite structure is more uniform and the average grain is smaller at lower strain rate and deformation temperature. And the increase of strain rate is not conducive to the occurrence of dynamic recrystallization. The relationship between the critical strain for dynamic recrystallization and the peak strain is ε_c/ε_p=0.47. The constitutive equation related to the coupled strain factor and critical strain prediction model can accurately predict the flow stress and critical strain values of low-carbon niobium-containing hot-rolled H-beam steel at different deformation temperatures.

Key words: new low carbon H-beam steel containing niobium, thermal deformation behavior, dynamic recrystallization critical strain, constitutive equation

CLC Number:

TG141

Li Junliang, Xing Jun, Ge Zhangqi, Li Fan, Wang Yongqiang, Li Na, Wu Baoqiao. Thermal deformation behavior of a low carbon hot-rolled H-beam steel containing niobium[J]. Heat Treatment of Metals, 2021, 46(5): 118-126.

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