Ni含量对EQ70海洋工程用钢CCT曲线的影响

doi:10.13251/j.issn.0254-6051.2022.01.017

金属热处理 ›› 2022, Vol. 47 ›› Issue (1): 100-105.DOI: 10.13251/j.issn.0254-6051.2022.01.017

Ni含量对EQ70海洋工程用钢CCT曲线的影响

陶素芬^1,2, 吴浩¹, 孙桂林^1,2, 陈龙¹, 陈波¹

1.安徽工业大学冶金工程学院, 安徽马鞍山 243002;
2.安徽工业大学冶金减排与资源综合利用教育部重点实验室, 安徽马鞍山 243002

收稿日期:2021-08-15 修回日期:2021-10-18 出版日期:2022-01-25 发布日期:2022-02-18
作者简介:陶素芬(1988—),女,讲师,博士,主要研究方向为高强海洋工程用钢的组织与性能,E-mail:ustbtsf@163.com
基金资助:
国家自然科学基金(51704007);安徽省高校科学研究项目(KJ2020A0273)

Effect of Ni content on continuous cooling transformation curves of EQ70 steel for marine engineering

Tao Sufen^1,2, Wu Hao¹, Sun Guilin^1,2, Chen Long¹, Chen Bo¹

1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan Anhui 243002, China;
2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling of Ministry of Education, Anhui University of Technology, Ma'anshan Anhui 243002, China

Received:2021-08-15 Revised:2021-10-18 Online:2022-01-25 Published:2022-02-18

摘要/Abstract

摘要： 采用DIL805A热膨胀仪测定了Ni含量分别为1.53%、1.72%、1.81%、2.06%的EQ70海洋工程用钢在不同冷速下的热膨胀曲线,结合组织观察和维氏硬度测定绘制其连续冷却转变曲线。结果表明,冷速在0.5 ℃/s以下,试验钢的组织为贝氏体,冷速超过2 ℃/s时,组织全部转变为马氏体。随着Ni含量增加,试验钢的Ac₃几乎不变,Ac₁和Ms降低,贝氏体转变的温度区间缩小,贝氏体转变的冷速范围扩大,贝氏体的形貌也发生变化,马氏体形貌没有发生明显变化。

关键词: Ni含量, 连续冷却转变, 海洋工程用钢, 组织, 硬度

Abstract: Thermal expansion curves of EQ70 steel for marine engineering with Ni content of 1.53%, 1.72%, 1.81% and 2.06% were measured by DIL805A thermal dilatometer at different cooling rates. Combined with microstructure and Vickers hardness, continuous cooling transformation curves of the steel were obtained. The results show that microstructure of the tested steels is all bainite when the cooling rate is below 0.5 ℃/s, while microstructure is all transformed into martensite as the cooling rate is above 2 ℃/s. With the increase of Ni content, Ac₃ of the tested steel changes little, Ac₁ and Ms decrease, the temperature range of bainite transformation decreases, the cooling rate range of bainite transformation expands, and the morphology of bainite also changes, but the morphology of martensite is almost unchanged.

Key words: Ni content, continuous cooling transformation, marine engineering steel, microstructure, hardness

中图分类号:

TG113.12

陶素芬, 吴浩, 孙桂林, 陈龙, 陈波. Ni含量对EQ70海洋工程用钢CCT曲线的影响[J]. 金属热处理, 2022, 47(1): 100-105.

Tao Sufen, Wu Hao, Sun Guilin, Chen Long, Chen Bo. Effect of Ni content on continuous cooling transformation curves of EQ70 steel for marine engineering[J]. Heat Treatment of Metals, 2022, 47(1): 100-105.

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Ni含量对EQ70海洋工程用钢CCT曲线的影响

Effect of Ni content on continuous cooling transformation curves of EQ70 steel for marine engineering

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