金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 224-226.DOI: 10.13251/j.issn.0254-6051.2021.04.042

• 失效分析 • 上一篇    下一篇

20Mn2A圆链钢的鱼眼断裂分析

温娟1, 来萍1, 杨荣光2, 任群1, 鞠新华1   

  1. 1.首钢集团有限公司技术研究院, 北京 100041;
    2.首钢京唐钢铁联合有限责任公司 钢轧作业部, 河北 唐山 063200
  • 收稿日期:2020-10-21 出版日期:2021-04-25 发布日期:2021-05-08
  • 作者简介:温娟(1978—),女,高级工程师,硕士,主要研究方向为钢铁材料微观组织检验及失效分析,E-mail:wenjuan_506@163.com

Fish-eye fracture analysis of 20Mn2A round chain steel

Wen Juan1, Lai Ping1, Yang Rongguang2, Ren Qun1, Ju Xinhua1   

  1. 1. Technical Research Institute of Shougang Group Co., Ltd., Beijing 100041, China;
    2. Steel Rolling Operation Department, Shousteel Jingtang Iron and Steel Co., Ltd., Tangshan Hebei 063200, China
  • Received:2020-10-21 Online:2021-04-25 Published:2021-05-08

摘要: 20Mn2A圆链钢在编链热处理后的拉伸试验中出现了断裂,在大多断口上发现有圆形或椭圆形平台。用扫描电镜、光学显微镜及直读光谱等仪器分别对圆链的断口形貌、组织、化学成分进行了分析。结果表明,圆链钢的化学成分正常,圆链的局部组织为回火马氏体和铁素体,铁素体组织的存在降低了圆链钢的硬度及耐磨性。圆链断口圆形平台的微观形貌为冰糖状沿晶形貌,平台中央有氧化铝类夹杂,这种以夹杂为核心的鱼眼状氢脆是引起圆链断裂的主要原因。

关键词: 20Mn2A钢, 圆链, 鱼眼, 氢脆

Abstract: 20Mn2A round chain steel was fractured in the tensile test after heat treatment of the braided chain, and round or oval platforms were found on most of the fractures. The fracture morphology, microstructure and chemical composition of the round chain were analyzed by scanning electron microscope, metallographic microscope and direct reading spectrometer. The results show that the chemical composition of the round chain steel is normal, and the microstructure of the round chain is tempered martensite and ferrite. The existence of ferrite reduces the hardness and wear resistance of the round chain steel. The micromorphology of the round platform on the steel fracture is crystal sugar-like intergranular morphology, and there are alumina inclusions on the central surface of the platform. The fish-eye hydrogen embrittlement with inclusions as the core is the main cause of the round chain fracture.

Key words: 20Mn2A steel, round chain, fish eye, hydrogen embrittlement

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