Effect of deformation on microstructure and properties of low-carbon microalloyed steel

doi:10.13251/j.issn.0254-6051.2022.06.015

Abstract

Abstract: Effect of online quenching and tempering process and conventional quenching and tempering process on microstructure and properties of a low-carbon microalloyed hull structural steel was comparatively investigated, and the strengthening and toughening mechanisms were discussed. The results show that compared with conventional quenching and tempering process, when the online quenching and tempering process is adopted, the deformation structure generated by the controlled rolling improves the phase transformation driving force and nucleation rate during the online quenching and cooling process, and fine bainitic lath is obtained. It is beneficial to the formation of nano-scale precipitates and high-density dislocations, thereby improving the strength of the low-carbon microalloyed steel and ensuring good low-temperature toughness. The overall performance (R_p0.2=599 MPa,KV₂(-40 ℃)=272 J/cm²,A=24.5%) meets the requirements of the 590 MPa class hull steel.

Key words: low-carbon microalloyed steel, online quenching, controlled rolling deformation, microstructure, properties

CLC Number:

TG156.31

Yan Xiang, Li Defa, Guan Jisheng, Yang Zhizheng. Effect of deformation on microstructure and properties of low-carbon microalloyed steel[J]. Heat Treatment of Metals, 2022, 47(6): 85-88.

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