金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 244-249.DOI: 10.13251/j.issn.0254-6051.2025.09.039

• 工艺研究 • 上一篇    下一篇

27SiMn钢连接头弯曲失效分析及热处理工艺优化

孟凡西1, 魏建华1, 曹国钦2, 潘慧超3, 杜学山3   

  1. 1.郑州煤机格林材料科技有限公司, 河南 郑州 450001;
    2.郑州大学 低碳环保材料智能设计国际联合研究中心, 河南 郑州 450001;
    3.郑州大学 材料科学工程学院, 河南 郑州 450001
  • 收稿日期:2025-05-21 修回日期:2025-07-30 出版日期:2025-09-25 发布日期:2025-10-13
  • 通讯作者: 魏建华,助理工程师,硕士,E-mail: 18503866208@163.com
  • 作者简介:孟凡西(1979— ),男,工程师,学士,主要研究方向为煤矿综采成套装备热处理,E-mail:1922213996@qq.com。
  • 基金资助:
    河南省重点研发专项(241111221500)

Bending failure analysis and heat treatment process optimization of 27SiMn steel connector

Meng Fanxi1, Wei Jianhua1, Cao Guoqin2, Pan Huichao3, Du Xueshan3   

  1. 1. Zhengzhou Coal Machinery Green Material Technology Co., Ltd., Zhengzhou Henan 450001, China;
    2. International Joint Research Center for Intelligent Design of Low Carbon and Environmentally Friendly Materials, Zhengzhou University, Zhengzhou Henan 450001, China;
    3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou Henan 450001, China
  • Received:2025-05-21 Revised:2025-07-30 Online:2025-09-25 Published:2025-10-13

摘要: 针对某超大采高支护装备连接头发生的弯曲失效问题,通过宏观形貌观察、化学成分分析、微观组织检验、力学性能测试及断口形貌分析等方法系统研究了失效机理。结果表明连接头失效的主要原因是材料碳含量偏低(低于设计标准)及热处理工艺不当导致的工件硬度不合格。基于此,提出以下改进方案:① 原材料控制:建立进厂材料碳含量快速检测机制,采用直读光谱仪进行100%检测,确保碳含量符合质控指标; ②最佳优化工艺为:采用阶梯式热处理工艺,工件在<300 ℃时装炉,以≤60 ℃/h升温至600 ℃保温60 min,再以≤150 ℃/h升温至920 ℃保温120 min后水淬;淬火后2 h内进行回火处理,在≤280 ℃装炉,以≤130 ℃/h升温至540 ℃保温3.5 h后水冷。工艺改进后,连接头的强度和硬度均匀性显著提高,经工程验证,改进后的产品在服役周期内未再发生弯曲失效现象。

关键词: 27SiMn钢, 支护装备, 连接头, 失效分析, 热处理

Abstract: In response to the bending failure problem of the connection head of a certain ultra large mining support equipment, the failure mechanism was systematically studied through macroscopic morphology observation, chemical composition analysis, microstructure inspection, mechanical property testing, and fracture morphology analysis. The results indicate that the main reason for the failure of the connector is the low carbon content of the material (lower than the design standard) and improper heat treatment process, which leads to the unqualified hardness of the workpiece. Based on this, the following improvement plan is proposed: ① Raw material control: A rapid detection mechanism for carbon content of incoming materials is established, a direct reading spectrometer for 100% detection is used, and ensuring that the carbon content meets the quality control standards. ② The optimal optimization process: A stepped heat treatment process is adopted, the workpiece is loaded into the furnace below 300 ℃, heated to 600 ℃ at a rate of ≤60 ℃/h for 60 min, and then heated to 920 ℃ at a rate of ≤150 ℃/h for 120 min before quenching with water. Tempering treatment shall be carried out within 2 h after quenching, and the furnace shall be loaded below 280 ℃. The temperature shall be raised to 540 ℃ at a rate of ≤130 ℃/h, maintaining for 3.5 h and then water cooling. After the process improvement, the strength and hardness uniformity of the connector are significantly improved. Through engineering verification, the improved product does not experience bending failure again during its service life.

Key words: 27SiMn steel, support equipment, connector, failure analysis, heat treatment

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