Ce对30MnNbRE钢淬火回火微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.025

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 143-149.DOI: 10.13251/j.issn.0254-6051.2023.09.025

Ce对30MnNbRE钢淬火回火微观组织和力学性能的影响

宋操, 王晓东, 包喜荣, 陈林, 汤雪娇

内蒙古科技大学材料与冶金学院, 内蒙古包头 014010

收稿日期:2023-05-01 修回日期:2023-07-18 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 王晓东,副教授,博士,E-mail: wxd6595111@126.com
作者简介:宋操(1996—),男,硕士研究生,主要研究方向为无缝钢管,E-mail:978746900@qq.com。
基金资助:
国家自然科学基金(52164046)

Effect of Ce on microstructure and mechanical properties of 30MnNbRE steel after quenching and tempering

Song Cao, Wang Xiaodong, Bao Xirong, Chen Lin, Tang Xuejiao

School of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou Inner Mongolia 014010, China

Received:2023-05-01 Revised:2023-07-18 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 采用扫描电镜、X射线衍射仪、硬度测试、拉伸试验、冲击试验等研究了稀土元素Ce对30MnNbRE钢淬、回火后微观组织及力学性能的影响规律。结果表明,Ce促进Nb在γ-Fe中固溶,增加淬火后的硬度,而回火时Ce促进纳米级(FeMnNb)₃C析出,尺寸约为40 nm,产生显著的析出强化作用,同时在马氏体板条间析出的(FeMnNb)₃C对位错的钉扎作用可细化板条厚度,最终获得均匀细化的纳米级马氏体板条结构。当Ce添加量为0.01%时,30MnNbRE钢的各项力学性能最佳,450 ℃回火后硬度可达42.6 HRC,抗拉强度提高至1135 MPa,同时获得尺寸约1 μm的细小球状夹杂物,断后伸长率最高可达13.8%,断口呈现韧性断裂特征。

关键词: Ce, 淬火回火, 微观组织, 力学性能, 析出, 稀土夹杂物

Abstract: Effect of rare earth element Ce on microstructure and mechanical properties of 30MnNbRE steel after quenching and tempering were studied by means of scanning electron microscope, X-ray diffractometer, hardness test, tensile test and impact test. The results show that Ce promotes the solution of Nb in γ-Fe and increases the hardness after quenching, while Ce promotes the precipitation of nanoscale (FeMnNb)₃C with a size of about 40 nm during tempering, resulting in a significant precipitation strengthening effect. At the same time, the pinning effect of (FeMnNb)₃C precipitated between laths refines the thickness of the martensite laths, and finally obtain a uniform and refined nanoscale martensite lath structure. When the addition amount of Ce is 0.01%, the mechanical properties of the 30MnNbRE steel are the best. After tempering at 450 ℃, the hardness can reach 42.6 HRC, the tensile strength increases to 1135 MPa, the fine spherical inclusions with a size of about 1 μm are obtained, concurrently the elongation after fracture is the largest which reaches 13.8%, and the fracture shows ductile fracture characteristics.

Key words: Ce, quenching and tempering, microstructure, mechanical properties, precipitation, rare earth inclusions

中图分类号:

TG335

宋操, 王晓东, 包喜荣, 陈林, 汤雪娇. Ce对30MnNbRE钢淬火回火微观组织和力学性能的影响[J]. 金属热处理, 2023, 48(9): 143-149.

Song Cao, Wang Xiaodong, Bao Xirong, Chen Lin, Tang Xuejiao. Effect of Ce on microstructure and mechanical properties of 30MnNbRE steel after quenching and tempering[J]. Heat Treatment of Metals, 2023, 48(9): 143-149.

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Ce对30MnNbRE钢淬火回火微观组织和力学性能的影响

Effect of Ce on microstructure and mechanical properties of 30MnNbRE steel after quenching and tempering

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