| 疲劳性能不合格的38Si7弹簧钢夹杂物分析 |
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| 引用本文： | 张宏亮,冯光宏,贾志立.疲劳性能不合格的38Si7弹簧钢夹杂物分析[J].钢铁,2011,46(5):85-88. |
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| 作者姓名： | 张宏亮 冯光宏 贾志立 |
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| 作者单位： | 1. 钢铁研究总院冶金工艺研究所2. 钢铁研究总院 工艺所 |
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| 摘 要： | 针对工业生产38Si7弹簧钢疲劳强度不合格的问题，借助光学显微镜和扫描电镜，并结合数学理论模型，从夹杂物的角度分析38Si7弹簧钢疲劳强度不合格的原因。研究结果表明：工业生产38Si7弹簧钢中的夹杂物主要组成为CaO(MgO) Al2O3 SiO2三元复合夹杂物，而且圆截面上中心区域复合夹杂物中Al2O3的含量明显低于外层复合夹杂物中Al2O3的含量；根据夹杂物等效投影面积模型得出，当疲劳失效为内部起裂时，临界夹杂物尺寸大约为6.5μm，当疲劳失效为表面起裂时，临界夹杂物尺寸大约为5.5μm。当弹簧钢中的夹杂物尺寸大于临界夹杂物尺寸时，容易造成疲劳强度失效。
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| 关 键 词： | 弹簧钢 疲劳失效 临界夹杂物尺寸 |
| 收稿时间： | 2010-06-09 |
Analysis of the Inclusions in 38Si7 Spring Steel With Fatigue Failure |
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| ZHANG Hong-liang,FENG Guang-hong,JIA Zhi-li.Analysis of the Inclusions in 38Si7 Spring Steel With Fatigue Failure[J].Iron & Steel,2011,46(5):85-88. |
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| Authors: | ZHANG Hong-liang FENG Guang-hong JIA Zhi-li |
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| Affiliation: | ZHANG Hong-liang,FENG Guang-hong,JIA Zhi-li(Metallurgy Department,Central Iron and Steel Research Institute,Beijing 100081,China) |
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| Abstract: | In view of the 38Si7 spring steel of industrial production with fatigue failure,using optical microscopy and scanning electron microscopy,combined with mathematical theoretical models,the reason of 38Si7 spring steel with fatigue failure was analyzed from the perspective of inclusion.The results show that the inclusions in 38Si7 spring steel of industrial production is mainly composed of CaO(MgO)-Al2O3-SiO2 ternary complex inclusions,and the Al2O3 composite contents of complex inclusion in the central regio... |
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| Keywords: | spring steel fatigue failure critical inclusion size |
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