Influence of rolling heating temperature on microstructure and impact property of a high strength low alloy steel

doi:10.13251/j.issn.0254-6051.2022.04.018

Abstract

Abstract: Effect of rolling heating temperature on microstructuree and －40 ℃ impact property of high strength low alloy(HSLA) steel was investigated. The results show that the microstructure of HSLA steel is composed by granular bainite. The size of M/A island increases with the increase of rolling heating temperature. When the rolling heating temperature is 1000-1150 ℃, the impact property is good, the M/A islands in the microstructure are finely dispersed, and the large-angle grain boundary density is relatively large. The grain size of the prior austenite is obviously coarser above 1150 ℃, the M/A islands produced after the phase transformation are significantly coarser, and the large-angle grain boundary density is lower. With the increasing of the rolling heating temperature, the M/A islands coarsened and the density of the large-angle interface decreased result in a decrease in impact toughness.

Key words: HSLA steel, hot rolling temperature, prior austenite, grain size, M/A island, impact property

CLC Number:

TG156.1

Chen Gang, Luo Xiaobing, Chai Feng, Yang Caifu, Zhang Zhengyan, Yang Li. Influence of rolling heating temperature on microstructure and impact property of a high strength low alloy steel[J]. Heat Treatment of Metals, 2022, 47(4): 116-121.

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