直接淬火对590 MPa含铜HSLA钢组织演变及力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.03.019

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 118-124.DOI: 10.13251/j.issn.0254-6051.2025.03.019

直接淬火对590 MPa含铜HSLA钢组织演变及力学性能的影响

王惟一¹, 潘应君¹, 周乃鹏², 柴锋², 罗小兵²

1.武汉科技大学材料与冶金学院, 湖北武汉 430000;
2.钢铁研究总院有限公司工程用钢研究院, 北京 100081

收稿日期:2024-09-28 修回日期:2025-01-19 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 周乃鹏,高级工程师,博士,E-mail:znp628@163.com
作者简介:王惟一(1999—),男,硕士研究生,主要研究方向为DQ工艺对高强韧船体结构用钢性能的影响,E-mail:1833086179@qq.com。

Effect of direct quenching on microstructure evolution and mechanical properties of a 590 MPa Cu-bearing HSLA steel

Wang Weiyi¹, Pan Yingjun¹, Zhou Naipeng², Chai Feng², Luo Xiaobing²

1. Faculty of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430000, China;
2. Research Institute of Structural Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2024-09-28 Revised:2025-01-19 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 对比离线淬火(Q)工艺,研究了直接淬火(DQ)工艺对590 MPa含铜HSLA钢组织演变及力学性能的影响。对经两种工艺处理后的试样,借助光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM)分析其微观组织,通过拉伸试验、冲击试验测试了其抗拉强度、屈服强度和低温韧性。结果表明, DQ工艺保留了控制轧制获得的大位错密度和细小晶粒,DQ试验钢的显微组织呈现压扁拉长的状态,Q试验钢的显微组织则为等轴晶粒,DQ试验钢的有效晶粒尺寸较Q试验钢更小,但强度和低温韧性差别不大。后续回火过程中产生了富Cu相和碳化物的析出,利用位错、细晶、沉淀等增强作用提高材料的屈服强度,并利用细晶强化弥补了位错密度增加、压扁状组织等因素造成的韧性下降。经直接淬火+680 ℃回火后试验钢综合性能最佳,其屈服强度较离线淬火+680 ℃回火(QT680)试验钢提高159 MPa,达到805 MPa,-84 ℃冲击吸收能量达到了248 J。

关键词: 含铜HSLA钢, 直接淬火, 屈服强度, 低温韧性

Abstract: Compared with the off-line quenching (Q) process, the effect of direct quenching (DQ) on the microstructure evolution and mechanical properties of a 590 MPa Cu-bearing HSLA steel was studied. The microstructure of the specimens was analyzed by OM, SEM, EBSD and TEM. The strength and toughness were tested by tensile test and impact test. The results show that the DQ process retains the large dislocation density and fine grains obtained through controlled rolling. The microstructure of the DQ tested steel exhibits a flattened and elongated state, while the microstructure of the Q tested steel consists of equiaxed grains. The effective grain size of the DQ tested steel is smaller than that of the Q tested steel, but there is little difference in strength and low-temperature toughness. In the subsequent tempering process, Cu-rich phase and carbide precipitation are produced, and the yield strength of the tested steel is improved by the enhancement of dislocation, fine grain and precipitation, while the reduction of toughness caused by the increase of dislocation density and the flattened structure is made up by fine grain strengthening. After direct quenching+680 ℃ tempering, the tested steel has the best comprehensive properties, and the yield strength is 805 MPa which is 159 MPa higher than that of off-line quenching+680 ℃ tempering and the impact absorbed energy at -84 ℃ is 248 J.

Key words: Cu-bearing HSLA steel, direct quenching, yield strength, low-temperature toughness

中图分类号:

TG156.3

王惟一, 潘应君, 周乃鹏, 柴锋, 罗小兵. 直接淬火对590 MPa含铜HSLA钢组织演变及力学性能的影响[J]. 金属热处理, 2025, 50(3): 118-124.

Wang Weiyi, Pan Yingjun, Zhou Naipeng, Chai Feng, Luo Xiaobing. Effect of direct quenching on microstructure evolution and mechanical properties of a 590 MPa Cu-bearing HSLA steel[J]. Heat Treatment of Metals, 2025, 50(3): 118-124.

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直接淬火对590 MPa含铜HSLA钢组织演变及力学性能的影响

Effect of direct quenching on microstructure evolution and mechanical properties of a 590 MPa Cu-bearing HSLA steel

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