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SWRM8螺栓帽头开裂原因分析

Analysis on rupture of SWRM8 bolt head

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【作者】 龚桂仙李建华许竹桃

【Author】 GONG Gui-xian,LI Jian-hua,XU Zhu-tao(Technology Center of WISCO,Wuhan 430080,China)

【机构】 武钢技术中心武钢技术中心 湖北武汉430080湖北武汉430080

【摘要】 用光学金相显微镜等分析手段,对用SWRM8材质制造的5.5 mm螺栓帽头开裂原因进行了分析。结果表明:SWRM8螺栓帽头开裂是线材表面线状缺陷经冷镦形成的;线状缺陷与铸坯缺陷(如纵裂纹、皮下气泡、夹渣等)以及热轧和冷拉拔过程中产生的划伤有关。

【Abstract】 Causes to the rupture of 5.5 mm bolt head out of SWRM8 are checked and analyzed by means of the optical metallographic microscope.Results show that the primary cause to the rupture of the bolt head SWRM8 is the surface defect of the wire rod occurring in the process of cold heading.The surface defect of the wire rod is closely related with the defects of the billets(such as longitudinal crack,subsurface blowhole and entrapped slag) as well as scratch taking place in the process of hot rolling and cold drawing.

【关键词】 SWRM8螺栓帽头开裂线状缺陷
【Key words】 SWRM8 boltbolt head rupturelinear defect
  • 【文献出处】 武钢技术 ,Wuhan Iron and Steel Corporation Technology , 编辑部邮箱 ,2006年03期
  • 【分类号】TH131
  • 【下载频次】53
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