金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 303-307.DOI: 10.13251/j.issn.0254-6051.2023.02.047

• 测试与分析 • 上一篇    下一篇

38CrMoAl圆钢调质裂纹形成原因分析

谭瑞松1, 黄雁2, 宋波1, 左小坦2, 朱利斌2, 刘威1, 杨树峰1   

  1. 1.北京科技大学 冶金与生态工程学院, 北京 100083;
    2.芜湖新兴铸管有限责任公司, 安徽 芜湖 241002
  • 收稿日期:2022-09-07 修回日期:2022-12-23 出版日期:2023-02-25 发布日期:2023-03-22
  • 通讯作者: 宋 波,教授,博士生导师,E-mail:songbo@metall.ustb.edu.cn
  • 作者简介:谭瑞松(1997—),男,硕士研究生,主要研究方向为金属材料,E-mail:s20200245@xs.ustb.edu.cn。

Cause analysis of crack formation of 38CrMoAl round steel bar after quenching and tempering

Tan Ruisong1, Huang Yan2, Song Bo1, Zuo Xiaotan2, Zhu Libin2, Liu Wei1, Yang Shufeng1   

  1. 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    2. Wuhu Xinxing Ductile Pipe Co., Ltd., Wuhu Anhui 241002, China
  • Received:2022-09-07 Revised:2022-12-23 Online:2023-02-25 Published:2023-03-22

摘要: 国内某钢厂38CrMoAl钢在调质过程中出现了裂纹,对裂纹处进行取样,通过化学成分、宏观检测、显微组织分析、扫描电镜分析等探索裂纹产生的原因。结果表明,该钢裂纹性质为淬火裂纹,其产生的主要原因是原始材料圆坯存在冶金缺陷(缩松、点状偏析等),而调质过程中在组织应力和热应力作用下促进了裂纹的扩展。

关键词: 38CrMoAl圆钢, 淬火裂纹, 缺陷, 成分偏析

Abstract: Cracks occurred after quenching and tempering in 38CrMoAl steel bar produced in a domestic steel mill, the crack was sampled, and the cause of cracks was investigated by means of chemical composition, macroscopic detection, microstructure analysis, scanning electron microscopy analysis, etc. The results show that the cracks are induced during quenching. The main reason for this is the presence of metallurgical defects including shrinkage, spot segregation, etc. in the original material round billet, while the effect of structural stress and thermal stress during the quenching and tempering promotes the propagation of the crack.

Key words: 38CrMoAl round steel, quenching crack, defect, segregation

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