回火温度对EH460级船用中厚钢板组织与强韧性的影响

doi:10.13251/j.issn.0254-6051.2021.05.013

金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 81-86.DOI: 10.13251/j.issn.0254-6051.2021.05.013

回火温度对EH460级船用中厚钢板组织与强韧性的影响

肖娜¹, 徐晓宁², 王益民², 孙永辉¹, 田勇²

1.东北大学分析测试中心, 辽宁沈阳 110819;
2.东北大学轧制技术及连轧自动化国家重点实验室, 辽宁沈阳 110819

收稿日期:2020-10-23 出版日期:2021-05-25 发布日期:2021-07-21
通讯作者: 孙永辉,高级实验师,E-mail:sunyonghui@mail.neu.edu.cn
作者简介:肖娜(1981—),女,高级实验师,主要研究方向为钢铁材料的电镜表征技术,E-mail:xiaona@mail.neu.edu.cn。
基金资助:
辽宁省科技重大专项资助 (2020JH1/10100001)

Effect of tempering temperature on microstructure, strength and toughness of EH460 grade medium and heavy ship plate steel

Xiao Na¹, Xu Xiaoning², Wang Yimin², Sun Yonghui¹, Tian Yong²

1. Analytical and Testing Center of Northeastern University, Shenyang Liaoning 110819, China;
2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang Liaoning 110819, China

Received:2020-10-23 Online:2021-05-25 Published:2021-07-21

摘要/Abstract

摘要： 利用光学显微镜、扫描电镜、电子背散射衍射分析和力学性能检测设备等,探究了回火温度对EH460级船板钢组织与力学性能的影响。结果表明:经400 ℃回火2 h处理后的试验钢具有最佳的强韧性匹配,屈服强度达到471 MPa,抗拉强度达到560 MPa,-40 ℃冲击吸收能量达到了312 J。回火后粗大M/A岛的分解、微观组织中大角度晶界比例与密度的上升以及有效晶粒尺寸降低是试验钢低温韧性改善的主要原因。

关键词: 回火温度, M/A岛, 低温韧性, 织构, 船板钢

Abstract: Effect of tempering temperature on the structure and mechanical properties of EH460 grade ship plate steel were investigated by using optical microscopy, scanning electron microscopy, electron backscattering diffraction analysis and mechanical properties testing. The results show that the tested steel tempered at 400 ℃ for 2 h has the best properties in strength and toughness, at which conditions the yield strength, tensile strength, and the impact toughness at -40 ℃ of the tested steel can reach 471 MPa, 560 MPa and 312 J, respectively. The main reasons for the improvement of low-temperature toughness of the tested steel after tempering are as follows: the decomposition of coarse M/A islands, the increase of the proportion and density of high-angle grain boundaries in the microstructure and the decrease of effective grain size.

Key words: tempering temperature, M/A island, low-temperature toughness, texture, ship plate steel

中图分类号:

TG142.1

肖娜, 徐晓宁, 王益民, 孙永辉, 田勇. 回火温度对EH460级船用中厚钢板组织与强韧性的影响[J]. 金属热处理, 2021, 46(5): 81-86.

Xiao Na, Xu Xiaoning, Wang Yimin, Sun Yonghui, Tian Yong. Effect of tempering temperature on microstructure, strength and toughness of EH460 grade medium and heavy ship plate steel[J]. Heat Treatment of Metals, 2021, 46(5): 81-86.

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回火温度对EH460级船用中厚钢板组织与强韧性的影响

Effect of tempering temperature on microstructure, strength and toughness of EH460 grade medium and heavy ship plate steel

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