金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 222-228.DOI: 10.13251/j.issn.0254-6051.2025.06.034

• 工艺研究 • 上一篇    下一篇

奥氏体化温度对NM450级耐磨钢组织与性能的影响

万欣1,2, 王伟蔚1,2, 万桥1,2, 唐星宇1,2, 肖卓1,2, 薛建强1,2, 韦雨齐1,2   

  1. 1.中国机械总院集团武汉材料保护研究所有限公司, 湖北 武汉 430030;
    2.特种材料表面工程全国重点实验室, 湖北 武汉 430030
  • 收稿日期:2025-01-28 修回日期:2025-04-09 出版日期:2025-06-25 发布日期:2025-07-08
  • 通讯作者: 陈亚平,正高级工程师,E-mail:250678500@qq.com
  • 作者简介:万 欣(1998—),男,助理工程师,硕士,主要研究方向为高性能钢铁材料强韧化,E-mail:304344962@qq.com。

Effect of austenitizing temperature on microstructure and properties of NM450 wear resistant steel

Wan Xin1,2, Wang Weiwei1,2, Wan Qiao1,2, Tang Xingyu1,2, Xiao Zhuo1,2, Xue Jianqiang1,2, Wei Yuqi1,2   

  1. 1. China Academy of Machinery Wuhan Research Institute of Materials Protection Co., Ltd., Wuhan Hubei 430030, China;
    2. State Key Laboratory of Special Materials Surface Engineering, Wuhan Hubei 430030, China
  • Received:2025-01-28 Revised:2025-04-09 Online:2025-06-25 Published:2025-07-08

摘要: 借助SEM、EBSD、TEM等手段表征了不同奥氏体化温度下NM450级耐磨钢的微观结构,同时对其力学性能和耐磨损性能的变化进行分析。结果表明,试验钢经不同奥氏体化温度(840~920 ℃)淬火+200 ℃回火后得到的组织均为板条马氏体和少量残留奥氏体。随着奥氏体化温度的升高,试验钢充分奥氏体化,马氏体板条发生粗化,组织变得均匀,基体析出了纳米级球形析出物(Ti, Nb)C以及棒状ε-FexC。在880 ℃淬火+200 ℃回火的条件下,试验钢强韧性和耐磨性能达到最优,抗拉强度为1614 MPa,屈服强度为1165 MPa,硬度达到48.5 HRC,磨损质量损失为0.140 95 g。

关键词: 耐磨钢, 奥氏体化温度, 微观组织, 力学性能, 耐磨性

Abstract: Microstructure of the NM450 wear resistant steel subjected to different austenitizing temperatures was characterized by using SEM, EBSD and TEM techniques, combined with analysis of mechanical properties and wear resistance. The results show that the microstructure of the tested steel quenched at different austenitizing temperatures (840-920 ℃) and tempered at 200 ℃ are all lath martensite and a small amount of retained austenite. With the increase of austenitizing temperature, further austenitization promotes coarsening of martensite laths and structural homogenization. Concurrently, nano-scale spherical (Ti, Nb)C precipitates and rod-shaped ε-FexC carbides precipitate from the matrix. The optimal strength, toughness and wear resistance are achieved when quenching at 880 ℃ and tempering at 200 ℃, demonstrating a tensile strength of 1614 MPa, yield strength of 1165 MPa, hardness of 48.5 HRC, and the mass loss of 0.140 95 g by wear test.

Key words: wear resistant steel, austenitizing temperature, microstructure, mechanical properties, wear resistance

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