Original scientific paper

Plastic properties and microstructure evolution of 20CrMoA steel during warm deformation

Sh. Xu ; Ningbo University, School of Mechanical Engineering and Mechanics, Ningbo, China; Department of Mechanical Engineering, Zhejiang Business and Technology Institute, Ningbo, China
D. Shu ; Ningbo University, School of Mechanical Engineering and Mechanics, Ningbo, China
Zh. L. Shen ; Department of Mechanical Engineering, Zhejiang Business and Technology Institute, Ningbo, China
L. J. Zhu ; Department of Mechanical Engineering, Zhejiang Business and Technology Institute, Ningbo, China
J. Zhao ; Ningbo Sub-Academy of the national weapons science research academy, Ningbo, China

Abstract

The plastic properties and microstructure evolution of 20CrMoA steel was analyzed at 600-750 °C and strain rate of 0,01-10 s-1.The result reveals that the deformation behavior is hardening followed by softening at low strain rates(0,01 s-1 and 0,1 s-1), but hardening is dominant in the whole deformation process at high strain rates(1 s-1and 10 s-1) and low temperature(600 °C and 650 °C). The strain rate sensitivity exponent increases with the increasing deformation temperature except for 650 °C and high strain rate. The spheroidization mechanism of cementite is the mechanical fracture and the dissolution of cementite particles. At 700 °C, spheroidized particles are finer and their distribution is more uniform than that at 750 °C.

Keywords

20CrMoA steel; warm deformation; plastic properties; strain-stress curves; microstructure evolution

Hrčak ID:

273841

URI

https://hrcak.srce.hr/273841

Publication date:

1.7.2022.

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