回火温度对1100 MPa高强海工钢组织及析出的影响

doi:10.13251/j.issn.0254-6051.2023.10.021

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 143-150.DOI: 10.13251/j.issn.0254-6051.2023.10.021

回火温度对1100 MPa高强海工钢组织及析出的影响

赵宋¹, 亚斌¹, 罗小兵², 张兴国¹

1.大连理工大学材料科学与工程学院, 辽宁大连 116023;
2.钢铁研究总院有限公司工程用钢院, 北京 100081

收稿日期:2023-03-07 修回日期:2023-07-29 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 罗小兵,高级工程师,E-mail:luosir2007@sina.com
作者简介:赵宋(1992—),男,硕士研究生,主要研究方向为超高强海工钢,E-mail:767437631@qq.com。

Effect of tempering temperature on microstructure and precipitation of a 1100 MPa high strength marine engineering steel

Zhao Song¹, Ya Bin¹, Luo Xiaobing², Zhang Xingguo¹

1. School of Materials Science and Engineering, Dalian University of Technology, Dalian Liaoning 116023, China;
2. Research Institute of Structural Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China

Received:2023-03-07 Revised:2023-07-29 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 采用OM、EBSD和TEM等分析方法对超高强含Cu海工钢经850 ℃淬火+不同温度回火处理后组织和力学性能进行了研究。结果表明,试验钢在425 ℃回火时出现硬度峰值435 HV5,这是基体中细小弥散分布的Cu(5 nm)粒子和少量的碳化物粒子的协同强化作用。在525 ℃过回火状态下,试验钢基体中Cu粒子发生粗化(6.5 nm),试验钢的强度下降,并且此时试验钢中脆化相M₃C渗碳体完全溶解转化为了更稳定的M₂C析出相、大角度晶界密度的增加和薄膜状逆转变奥氏体的含量增加等因素,使得-40 ℃时的冲击吸收能量KV₂从475 ℃回火的6 J提升至525 ℃回火的180 J,低温韧性得到了显著改善。随着回火温度的再次升高,马氏体基体软化更为明显,且 Cu粒子和M₂C碳化物进一步粗化,试验钢的强度明显降低。试验钢在525 ℃回火能获得良好的强韧性匹配,抗拉强度和屈服强度分别为 1188 MPa 和 1119 MPa,-40 ℃时的冲击吸收能量KV₂为 180 J。

关键词: 海工钢, 回火温度, 回火脆性, Cu析出强化

Abstract: Microstructure and mechanical properties of an ultra-high strength Cu-bearing marine engineering steel quenched at 850 ℃ and tempered at different temperatures were studied by means of OM, EBSD and TEM. The results show that when the tested steel is tempered at 425 ℃, a hardness peak of 435 HV5 appears, which is the synergistic strengthening effect of finely dispersed 5 nm Cu particles and a small amount of carbide particles in the matrix. In the overtempering state of 525 ℃, the Cu particles in the tested steel matrix are coarsened (6.5 nm), the strength of the tested steel decreases, and factors such as that the brittle phase M₃C cementite in the tested steel is completely dissolved and transforms into more stable M₂C precipitates, and the increase of the density of high-angle grain boundaries, as well as the content of film-like reverse-transformed austenite make the KV₂ at -40 ℃ increase from 6 J tempered at 475 ℃ to 180 J tempered at 525 ℃, thus the low temperature toughness is significantly improved. As the tempering temperature increases again, the softening of the martensite matrix is more obvious, and the Cu particles and M₂C carbides are further coarsened, and the strength of the tested steel is significantly reduced. It is concluded that the properties of the tested steel tempered at 525 ℃ achieves a good match of strength and toughness, the tensile strength and yield strength are 1188 MPa and 1119 MPa, respectively, and the impact absorbed energy KV₂ at -40 ℃ is 180 J.

Key words: marine engineering steel, tempering temperature, temper brittleness, Cu precipitation strengthening

中图分类号:

TG142.1

赵宋, 亚斌, 罗小兵, 张兴国. 回火温度对1100 MPa高强海工钢组织及析出的影响[J]. 金属热处理, 2023, 48(10): 143-150.

Zhao Song, Ya Bin, Luo Xiaobing, Zhang Xingguo. Effect of tempering temperature on microstructure and precipitation of a 1100 MPa high strength marine engineering steel[J]. Heat Treatment of Metals, 2023, 48(10): 143-150.

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回火温度对1100 MPa高强海工钢组织及析出的影响

Effect of tempering temperature on microstructure and precipitation of a 1100 MPa high strength marine engineering steel

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