Microstructure evolution of 280VK cold-rolled high-strength steel and precipitation mechanism during annealing process

doi:10.13251/j.issn.0254-6051.2022.09.038

Abstract

Abstract: In order to reveal the effect of annealing process on microstructure, texture evolution and mechanical properties, the hot-rolled microalloyed high-strength steel 280VK was cold-rolled and then annealed at different temperatures, then the microstructure was observed by SEM, TEM and EBSD, meanwhile the content of precipitates and mechanical properties were measured and analyzed. The results show that after annealing, a large number of TiC precipitated particles are generated in the matrix of the tested steel. As the annealing temperature increases, the grain size increases, the average size of precipitated particles increases but the number decreases, the tensile strength and yield strength decrease, while the elongation increases. Thermodynamic calculation shows that the priority order of the precipitates in the tested steel is TiN>AlN>TiC, and TiC is the main one.

Key words: 280VK cold-rolled high-strength steel, annealing process, microstructure, mechanical properties, precipitation mechanism

CLC Number:

TG156

Qiao Degao, Luo Xiaoyang, Hu Shuangxi, Hou Yuanyuan, Zhang Zhijian, Tang Xingchang. Microstructure evolution of 280VK cold-rolled high-strength steel and precipitation mechanism during annealing process[J]. Heat Treatment of Metals, 2022, 47(9): 220-226.

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