金属热处理 ›› 2022, Vol. 47 ›› Issue (6): 266-269.DOI: 10.13251/j.issn.0254-6051.2022.06.047

• 测试与分析 • 上一篇    下一篇

G12MnMo7-4钢异常组织分析及调质工艺优化

常有余, 宋仲明, 李富燕, 苟春林   

  1. 中车长江铜陵车辆有限公司, 安徽 铜陵 244100
  • 收稿日期:2022-01-04 修回日期:2022-05-08 出版日期:2022-06-25 发布日期:2022-07-05
  • 作者简介:常有余(1987—),男,工程师,学士,主要研究方向为热处理及金属材料,E-mail: you0yu123@163.com

Abnormal microstructure analysis of G12MnMo7-4 steel and quenching and tempering process optimization

Chang Youyu, Song Zhongming, Li Fuyan, Gou Chunlin   

  1. CRRC Yangtze Tongling Co., Ltd., Tongling Anhui 244100, China
  • Received:2022-01-04 Revised:2022-05-08 Online:2022-06-25 Published:2022-07-05

摘要: 采用光学显微镜(OM)、扫描电镜(SEM)、万能试验机、显微维氏硬度计等对调质态G12MnMo7-4钢铸件出现异常组织原因进行分析,并对其调质工艺做了优化。结果表明,因G12MnMo7-4钢属于低碳合金钢,调质淬火温度较高,致使局部产生过热异常组织;经改进调质工艺(870 ℃保温3 h急冷淬火+580 ℃保温3 h回火)处理后,组织为较细的回火索氏体,且综合性能良好,满足产品技术条件要求。

关键词: G12MnMo7-4钢, 异常组织, 调质, 回火索氏体

Abstract: Reasons for abnormal microstructure of quenched and tempered G12MnMo7-4 steel castings were analyzed by means of optical microscope (OM), scanning electron microscope (SEM), universal testing machine and micro Vickers hardness tester. And the quenching and tempering process was optimized. The results show that G12MnMo7-4 steel is a low-carbon alloy steel, due to high quenching temperature, overheating abnormal structure appears in some parts. After treated by improved quenching and tempering process (870 ℃×3 h rapid quenching+580 ℃×3 h tempering), the microstructure is fine tempered sorbite with good comprehensive properties, which meets the requirements of product technical conditions.

Key words: G12MnMo7-4 steel, abnormal structure, quenching and tempering, tempered sorbite

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