金属热处理 ›› 2024, Vol. 49 ›› Issue (4): 251-256.DOI: 10.13251/j.issn.0254-6051.2024.04.040

• 表面工程 • 上一篇    下一篇

可控离子渗入渗氮处理对25Cr3Mo3NiNbZr钢力学性能的影响

龙李威1, 王晓变2, 罗德福1, 郭星影2, 曾汇松1, 陈端杰2   

  1. 1.西华大学 材料科学与工程学院, 四川 成都 610039;
    2.重庆长安工业(集团)有限公司, 重庆 401120
  • 收稿日期:2023-10-12 修回日期:2024-02-26 出版日期:2024-04-25 发布日期:2024-05-27
  • 通讯作者: 罗德福,教授,博士,E-mail:cd_df@126.com
  • 作者简介:龙李威(1998—),男,硕士研究生,主要研究方向为金属材料表面改性,E-mail:Lonlyve@163.com。
  • 基金资助:
    慧眼行动项目(628020215)

Effect of PIP nitriding treatment on mechanical properties of 25Cr3Mo3NiNbZr steel

Long Liwei1, Wang Xiaobian2, Luo Defu1, Guo Xingying2, Zeng Huisong1, Chen Duanjie2   

  1. 1. School of Materials Science and Engineering, Xihua University, Chengdu Sichuan 610039, China;
    2. Chongqing Changan Industry (Group) Co., Ltd., Chongqing 401120, China
  • Received:2023-10-12 Revised:2024-02-26 Online:2024-04-25 Published:2024-05-27

摘要: 采用XRD、光学显微镜、扫描电镜、拉伸试验机和冲击试验机研究了可控离子渗入(PIP)渗氮处理对25Cr3Mo3NiNbZr钢组织和力学性能的影响。结果表明,PIP渗氮处理可在25Cr3Mo3NiNbZr钢表面形成硬度高于900 HV10的渗氮层,表面显微压痕无开裂和塌陷现象,脆性为1级。断口分析表明渗氮层区域呈解理断裂特征,拉伸过程渗氮层无崩落现象,与基体结合强度高。渗氮层的形成可以起到阻碍材料塑性变形的作用,PIP渗氮后25Cr3Mo3NiNbZr钢的强度无明显变化,塑性和韧性降低。

关键词: 25Cr3Mo3NiNbZr钢, 可控离子渗入(PIP), 渗氮, 力学性能

Abstract: Effect of PIP nitriding treatment on microstructure and mechanical properties of 25Cr3Mo3NiNbZr steel was investigated by using XRD, optical microscope, scanning electron microscope, tensile testing machine and impact testing machine. The results show that a nitrided layer with the surface hardness higher than 900 HV10 is formed on the 25Cr3Mo3NiNbZr steel after PIP nitriding treatment, the surface microindentation is free of cracking and collapsing phenomenon, and the brittleness is grade 1. The fracture analysis results show that the nitrided layer region is characterized by cleavage fracture, and the nitrided layer does not fall off during the tensile process, and the bonding strength with the matrix is high. The formation of nitrided layer can play a role in hindering plastic deformation, and there is no significant change in the strength of the 25Cr3Mo3NiNbZr steel after PIP nitriding, but the plasticity and toughness are reduced.

Key words: 25Cr3Mo3NiNbZr steel, programmable ion permeation (PIP), nitriding, mechanical properties

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