| SWRCH18A冷镦钢镦制螺钉开裂原因分析 |
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| 引用本文： | 罗新中,林晏民,潘逸飞.SWRCH18A冷镦钢镦制螺钉开裂原因分析[J].失效分析与预防,2016,11(6):372-376. |
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| 作者姓名： | 罗新中 林晏民 潘逸飞 |
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| 作者单位： | 宝钢集团广东韶关钢铁有限公司检测中心, 广东 韶关 512123 |
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| 摘 要： | 使用SWRCH18A冷镦钢盘条镦制螺钉过程中部分螺钉头出现开裂。对开裂试样进行宏观观察、金相检测、非金属夹杂物检测、电镜检测等各种试验分析，对缺陷部位进行显微硬度及微区能谱成分分析，最终确认螺钉头开裂的主要原因是盘条内部近表面区域存在异金属夹杂物。异金属夹杂物产生的主要原因是由于冶炼操作不当，补加的硅锰等铁合金不能全部熔化或扩散不均匀引起的。异金属夹杂物属于不允许存在的缺陷，严重地破坏了钢组织的完整性，使材料在后续轧制、拉拔、冷镦等加工过程中形成裂纹并开裂。
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| 关 键 词： | 冷镦钢 螺钉 开裂 组织 异金属夹杂物 |
| 收稿时间： | 2016-09-03 |
Cracking Analysis of SWRCH18 A Screws in Cold Heading Process |
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| LUO Xin-zhong,LIN Yan-min,PAN Yi-fei.Cracking Analysis of SWRCH18 A Screws in Cold Heading Process[J].Failure Analysis and Prevention,2016,11(6):372-376. |
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| Authors: | LUO Xin-zhong LIN Yan-min PAN Yi-fei |
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| Abstract: | Part of the SWRCH18A screws cracked at heads in the pier process from cold heading steel wire rod to screws. Macro-observation, metallographic examination, non-metallic inclusion test and electron microscopy examination, as well as micro hardness test on defective parts and EDS analysis were carried out to find out the failure cause of the screws. The results show that the main failure cause is that dissimilar mental inclusion existed near the surface of the internal wire rod. The dissimilar mental inclusion was mainly caused by improper melting operation and extra silicon-manganese alloys, which could not be incompletely molten or unevenly spread. The dissimilar mental inclusion is not allowable flaw, which destroys the integrity of steel microstructure and ruptures in the process of subsequent rolling, drawing and cold heading. |
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| Keywords: | cold heading steel screw crack microstructure dissimilar mental inclusion |
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