金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 301-304.DOI: 10.13251/j.issn.0254-6051.2024.08.050

• 测试与分析 • 上一篇    

20CrMnTi钢旋挖钻机方头的失效分析

张俊花1, 周大鹏2, 郁永昊3, 康学勤3   

  1. 1.江苏联合职业技术学院 徐州技师分院, 江苏 徐州 221151;
    2.中煤科工集团 淮北爆破技术研究院有限公司, 安徽 淮北 235000;
    3.中国矿业大学 材料与物理学院, 江苏 徐州 221116
  • 收稿日期:2024-03-11 修回日期:2024-06-16 出版日期:2024-08-25 发布日期:2024-09-27
  • 通讯作者: 康学勤,副教授,博士,E-mail:cumtkxq@cumt.edu.cn
  • 作者简介:张俊花(1979—),女,讲师,主要研究方向为金属材料失效分析和热处理,E-mail:729155784@qq.com。
  • 基金资助:
    中央高校基本科研业务费专项资金(2019XKQYMS17)

Failure analysis of 20CrMnTi steel rotary drilling rig square head

Zhang Junhua1, Zhou Dapeng2, Yu Yonghao3, Kang Xueqin3   

  1. 1. Xuzhou Technician Branch, Jiangsu Union Technical Institute, Xuzhou Jiangsu 221151, China;
    2. Huaibei Blasting Technology Research Institute Limited Company, China Coal Technology Engineering Group, Huaibei Anhui 235000, China;
    3. School of Materials and Physics, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
  • Received:2024-03-11 Revised:2024-06-16 Online:2024-08-25 Published:2024-09-27

摘要: 旋挖钻机用20CrMnTi钢方头在使用30 d后发生断裂。通过断口形貌观察、化学成分分析、力学性能测试和显微组织观察,对20CrMnTi钢方头断裂原因进行了分析。结果表明:设计判据和材料热处理工艺选择不当,使方头材料强度、硬度低,使用过程中在扭转应力作用下在方头应力集中部位出现过载断裂。材料成分中P元素超标,材料有冷脆倾向,使断口呈现脆性断裂特征。加强原材料质量检验,使其成分满足标准要求。采用淬火+低温回火处理工艺,使方头材料强度和硬度满足技术要求。

关键词: 旋挖钻机方头, 20CrMnTi钢, 失效分析

Abstract: 20CrMnTi steel rotary drilling rig square head was fractured after use for 30 days. Failure analysis was conducted through fracture morphology observation, chemical composition analysis, mechanical properties and microstructure analysis. The results show that both the design criterion and the heat treatment process are not so rational, which leads to decreased strength and hardness of the square head. Overload fracture is easy to occur at the stress concentration area of the square head under the action of torsional stress during the using. When the P element content exceeds the standard requirement, the material has a tendency towards cold brittleness, showing brittle fracture. The quality inspection of raw materials should be strengthened to meet the standard requirements. Quenching and low-temperature tempering should be adopted to ensure that the strength and hardness of the square head material meet the technical requirements.

Key words: rotary drilling rig square head, 20CrMnTi steel, failure analysis

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