Effect of controlled cooling process on microstructure and mechanical properties of hot-rolled dual phase steel

doi:10.13251/j.issn.0254-6051.2022.09.023

Abstract

Abstract: Based on the principle of alloy reduction,a 600 MPa grade hot-rolled dual phase steel with better strength and toughness was obtained by using hot rolling and ultra fast cooling technology, and then the effect of controlled cooling process on microstructure and mechanical properties of the tested steel was studied. The results show that with the decrease of relaxation time and coiling temperature, the volume fraction and grain size of ferrite decrease gradually, the tensile strength increases from 602 MPa to 637 MPa, the elongation decreases from 31.0% to 24.0%, the yield ratio is 0.53-0.59, and the n value is 0.17-0.21. Considering the mill load and mechanical properties, the appropriate coiling temperature and relaxation time for the tested steel are 150 ℃ and 7 s, respectively.

Key words: hot-rolled dual phase steel, controlled cooling process, microstructure, mechanical properties

CLC Number:

TG113.1

Xiong Weiliang, Liang Wen, Wu Teng, Liang Liang, Wu Haohong. Effect of controlled cooling process on microstructure and mechanical properties of hot-rolled dual phase steel[J]. Heat Treatment of Metals, 2022, 47(9): 130-133.

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