轧制加热温度对高强度低合金钢组织及冲击性能的影响

doi:10.13251/j.issn.0254-6051.2022.04.018

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 116-121.DOI: 10.13251/j.issn.0254-6051.2022.04.018

轧制加热温度对高强度低合金钢组织及冲击性能的影响

陈刚^1,2, 罗小兵¹, 柴锋¹, 杨才福¹, 张正延¹, 杨丽¹

1.钢铁研究总院有限公司工程用钢研究院, 北京 100081;
2.清华大学材料科学与工程学院, 北京 100084

收稿日期:2021-10-03 修回日期:2021-12-23 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 罗小兵,高级工程师,E-mail: luosir2007@sina.com
作者简介:陈刚(1989—),男,博士研究生,主要研究方向为高性能船体结构钢,E-mail: chen-g15@mails.tsinghua.edu.cn。
基金资助:
国家重点研发计划(2017YFB0701802)

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

Chen Gang^1,2, Luo Xiaobing¹, Chai Feng¹, Yang Caifu¹, Zhang Zhengyan¹, Yang Li¹

1. Research Instituteof Engineering Steel, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China;
2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2021-10-03 Revised:2021-12-23 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 研究了轧制加热温度对高强度低合金钢相变组织及－40 ℃冲击性能的影响。结果表明,不同轧制加热温度条件下,试验钢显微组织由粒状贝氏体组成,M/A岛尺寸随着轧制加热温度的升高而增大。轧制加热温度在1000~1150 ℃时,冲击性能良好,显微组织中M/A岛细小弥散,大角度晶界密度较大。轧制加热温度高于1150 ℃时,原始奥氏体晶粒尺寸明显粗化,相变后产生的M/A岛明显粗化,大角度晶界密度降低;随着轧制加热温度的升高,M/A岛的粗化以及大角度晶界密度的降低,共同导致冲击性能的下降。

关键词: HSLA钢, 轧制加热温度, 原始奥氏体, 晶粒尺寸, M/A岛, 冲击性能

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

中图分类号:

TG156.1

陈刚, 罗小兵, 柴锋, 杨才福, 张正延, 杨丽. 轧制加热温度对高强度低合金钢组织及冲击性能的影响[J]. 金属热处理, 2022, 47(4): 116-121.

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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轧制加热温度对高强度低合金钢组织及冲击性能的影响

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

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