金属热处理 ›› 2021, Vol. 46 ›› Issue (10): 270-274.DOI: 10.13251/j.issn.0254-6051.2021.10.050

• 测试与分析 • 上一篇    

柴油机曲轴裂纹失效原因分析

张怀青1, 于进文2, 王庆泉1, 方桂景1, 关慧欢2, 王一鸣1, 魏聪1   

  1. 1.潍柴重机股份有限公司, 山东 潍坊 261108;
    2.潍柴动力股份有限公司, 山东 潍坊 261021
  • 收稿日期:2021-06-10 出版日期:2021-10-25 发布日期:2021-12-08
  • 通讯作者: 关慧欢,硕士, E-mail:guanhuihuan@126.com
  • 作者简介:张怀青(1966—),男,高级工程师,主要研究方向为热处理工艺及零件失效分析,E-mail:zhanghq@weichai.com

Crack failure cause analysis of diesel engine crankshaft

Zhang Huaiqing1, Yu Jinwen2, Wang Qingquan1, Fang Guijing1, Guan Huihuan2, Wang Yiming1, Wei Cong1   

  1. 1. Weichai Heavy Machinery Co., Ltd., Weifang Shandong 261108, China;
    2. Weichai Power Co., Ltd., Weifang Shandong 261021, China
  • Received:2021-06-10 Online:2021-10-25 Published:2021-12-08

摘要: 通过对QT900-2型球墨铸铁柴油机曲轴的化学成分分析、显微组织及裂纹的宏微观形貌分析、硬化层深度测量和力学性能测试,分析了曲轴裂纹的失效原因。结果表明,柴油机划瓦,导致曲轴表层二次淬火,次表层发生再回火,使轴颈表面产生了较大内应力,是诱发裂纹失效的主要原因,表层局部存在的碳化物和疏松是裂纹生成的内在因素。

关键词: 曲轴, QT900-2球墨铸铁, 裂纹, 组织, 失效, 划瓦

Abstract: Failure reason of cracks in a QT900-2 nodular cast iron diesel engine crankshaft was analyzed by means of chemical composition analysis, microstructure analysis, macro and micro morphology analysis of the cracks, hardened layer depth measurement and mechanical performance testing. The results show that the diesel engine is scratched first, resulting in the secondary quenching on the surface and re-tempering in the subsurface layer of the crankshaft, causing a large internal stress on the surface of the journal, which is the main reason for the induced crack failure, and the existence of carbides and looseness at surface layer is the internal factor of crack formation.

Key words: crankshaft, QT900-2 nodular cast iron, crack, structure, failure, bearing scratch

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