金属热处理 ›› 2020, Vol. 45 ›› Issue (5): 262-265.DOI: 10.13251/j.issn.0254-6051.2020.05.050

• 测试与分析 • 上一篇    下一篇

低合金高强钢断后伸长率不合格原因分析

孙雪娇   

  1. 山钢股份 莱芜分公司技术中心, 山东 济南 271104
  • 收稿日期:2019-10-23 出版日期:2020-05-25 发布日期:2020-09-02
  • 作者简介:孙雪娇(1988—),女,工程师,硕士,主要研究方向为金相和扫描电镜分析与检测,E-mail: sunxuejiao_happy@126.com

Causes analysis on anormal elongation of low-alloyed high strength steel

Sun Xuejiao   

  1. The Technology Center of Laiwu Branch, Shandong Iron and Steel Co., Ltd., Jinan Shandong 271104, China
  • Received:2019-10-23 Online:2020-05-25 Published:2020-09-02

摘要: 针对低合金高强钢伸长率偏低的现象,对不合格的试样进行了探伤分析、显微组织观察、扫描电镜断口分析以及EDS夹杂物成分确定,最终发现伸长率不合格的原因为锰元素的偏聚造成了夹杂物过多、偏析处组织异常,同时这两种缺陷的存在还形成了氢陷阱引起了氢脆,在拉伸断口形成了脆性的氢致平台。

关键词: 低合金高强钢, 伸长率, 偏析, 夹杂物, 拉伸白点

Abstract: In view of the phenomenon of lower elongation about low-alloyed high strength steel, the chemical composition analysis, microstructure observation, fracture analysis and inclusion composition of the samples of the unqualified product were carried out. The results show that the main cause is related to the abnormal structure due to segregation of manganese elements, which formes hydrogen trap and then lead to hydrogen embrittlement, forming hydrogen brittle facets on the tensile fracture.

Key words: low-alloyed high strength steel, elongation, segregation, inclusion, tensile flake

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