Effect of Ni on the Features of Cu-rich Precipitates in High-strength Low Alloy Steel
CHAI Feng1, WANG Zemin2, LUO Xiaobin1, ZHANG Zhengyan1, LIU Min2, WANG Zhanyong2
1 Institute of Structural Steels,Central Iron & Steel Research Institute Co., Ltd., Beijing 100081, China 2 School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Abstract: In this work, the influence of Ni (wt%)contents on the microstructure, mechanical properties and Cu-rich precipitates (CRPs) of high-strength low alloy (HSLA) steels (1.5 Ni and 2.0 Ni), which were subjected to water quenching at 900 ℃ and aging process at 630 ℃ for 2 h, were studied by optical microscopy (OM), high-resolution electron microscopy (HRTEM) and atom probe tomography (APT). The results indicate that the strength and impact absorption energy (-60 ℃) of 2.0 Ni steel are higher than those of 1.5 Ni steel. The microstructure of two steels has no obvious change as Ni content increases, which is mainly constituted of lath and granular bainite. In 1.5 Ni steel, CRPs with twinned fcc structure are mostly ellipsoid, and the average radius and number density are around 3.5 nm and 1.5×1022 m-3, respectively. By comparison, in 2.0 Ni steel, CRPs with 9R structure are mostly spherical, and the average radius and number density are about 2.9 nm and 2.9×1022 m-3, respectively. With Ni content increasing, the critical nucleation energy of CRPs decreased and number density increased. Meanwhile, Ni and Mn atoms more likely segregate at the CRPs/matrix interfaces in 2.0 Ni steel, which can effectively decline the interfacial energy. Thus, CRPs is relatively stable and difficult to grow up and coarsen. As a result, the size of CRPs in 2.0 Ni steel was relatively small, but the number density was higher, corresponding to higher precipitation strengthening effects.
作者简介: 柴锋,钢铁研究总院正高级工程师,2008年毕业于上海交通大学材料学专业获博士学位,主要从事高性能船舶与海洋工程用钢研发工作,发表学术论文30余篇。 王泽民,高级实验师/博士,实验中心副主任,硕士研究生导师。2020年毕业于上海大学材料学专业,获工学博士学位。2010年进入上海应用技术大学工作,主要从事实验室教学与管理工作,研究方向为先进金属材料微观结构与性能研究。在Acta Materialia、Journal of Alloys and Compounds、Materials Science and Engineering A、Microscopy and Microanalysis、《金属学报》等国内外刊物发表论文20多篇,授权国家发明专利4项。现任中国体视学学会金相与显微分会理事、上海市有色金属学会铝基复合材料分会专家委员会成员,《理化检验-物理分册》杂志编委。
引用本文:
柴锋, 王泽民, 罗小兵, 张正延, 刘敏, 王占勇. Ni对高强度低合金钢中富Cu相析出特征的影响[J]. 材料导报, 2022, 36(11): 21070210-5.
CHAI Feng, WANG Zemin, LUO Xiaobin, ZHANG Zhengyan, LIU Min, WANG Zhanyong. Effect of Ni on the Features of Cu-rich Precipitates in High-strength Low Alloy Steel. Materials Reports, 2022, 36(11): 21070210-5.
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2022, Vol. 36 
