金属热处理 ›› 2024, Vol. 49 ›› Issue (11): 138-142.DOI: 10.13251/j.issn.0254-6051.2024.11.020

• 工艺研究 • 上一篇    下一篇

Ms点以下等温处理对15NiCuMoNb5钢组织的影响

赵倩1, 张亚然2, 乔志霞1, 董纪3, 张俊萍4   

  1. 1.天津商业大学 机械工程学院, 天津 300134;
    2.邢台学院 材料科学研究中心, 河北 邢台 054001;
    3.天津中德应用技术大学 机械工程学院, 天津 300350;
    4.天津钢管制造有限公司产品所, 天津 300301
  • 收稿日期:2024-06-10 修回日期:2024-09-28 出版日期:2024-11-25 发布日期:2025-01-09
  • 通讯作者: 乔志霞,教授,博士,E-mail:qiaozx@tjcu.edu.cn
  • 作者简介:赵 倩(1990—),女,副教授,博士,主要研究方向为金属材料组织与性能调控,E-mail:zhaoqiantjums@163.com。
  • 基金资助:
    国家自然科学基金(51974201,52004181);天津市津南区科技计划(20220110)

Effect of isothermal treatment below Ms point on microstructure of 15NiCuMoNb5 steel

Zhao Qian1, Zhang Yaran2, Qiao Zhixia1, Dong Ji3, Zhang Junping4   

  1. 1. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China;
    2. Material Science Research Center, Xingtai University, Xingtai Hebei 054001, China;
    3. School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;
    4. Product Institute of Tianjin Pipe Co., Ltd., Tianjin 300301, China
  • Received:2024-06-10 Revised:2024-09-28 Online:2024-11-25 Published:2025-01-09

摘要: 利用扫描电镜(SEM)和透射电镜(TEM)对15NiCuMoNb5钢在Ms点以下经不同温度等温处理后的微观组织和析出相进行了分析。结果表明,在370 ℃等温处理时,M-A岛以微米级长条状形貌为主,析出相以M3C和富Cu相为主。310 ℃等温处理后M-A岛以传统的块状形貌为主,析出相则以球状富Nb碳化物为主。M-A岛形貌和析出相的不同主要取决于不同温度等温处理时碳元素扩散速率及析出相驱动力的差异。

关键词: 15NiCuMoNb5钢, M-A岛, 析出相

Abstract: Microstructure and precipitates of 15NiCuMoNb5 steel after isothermal treatment at different temperatures below the Ms point were analyzed by using scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that when isothermally treated at 370 ℃, M-A islands mainly exhibit a micro-sized long-striped morphology, and the precipitated phases are mainly M3C and Cu-rich phases. After isothermal treatment at 310 ℃, the M-A island is dominated by traditional bulk morphology, and the precipitated phases are mainly spherical Nb-rich carbides. The difference of M-A island morphology and precipitated phase mainly depends on the difference of carbon diffusion rate and driving force of precipitated phase at different temperatures.

Key words: 15NiCuMoNb5 steel, M-A island, precipitated phase

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