| 高强汽车大梁钢辊压开裂分析 |
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| 引用本文： | 刘志卫,李 杨,李中华,吕耀强,高 燕,白 敏.高强汽车大梁钢辊压开裂分析[J].物理测试,2020,38(5):27. |
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| 作者姓名： | 刘志卫 李 杨 李中华 吕耀强 高 燕 白 敏 |
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| 作者单位： | 河钢乐亭钢铁有限公司技术创新部， 河北 唐山 063606 |
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| 摘 要： | 利用光学显微镜（OM）、扫描电镜（SEM）对某公司生产的750 MPa级别高强汽车大梁钢在辊压时出现开裂现象进行分析。结果表明：分条剪切时剪切断面质量不良，刃间隙调节不合理，在剪刃间隙较大的一侧，端面存在较多毛刺和微裂纹是开裂的外部原因；热轧过程RT2温度异常过高，造成材料严重混晶，韧性下降是造成开裂的内在原因。
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| 关 键 词： | 大梁钢 辊压 开裂 混晶 |
| 收稿时间： | 2019-12-06 |
Analysis of roll cracking of high-strength automobile beam steel |
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| LIU Zhi-wei,LI Yang,LI Zhong-hua,LUYao-qiang,GAO Yan,BAI Min.Analysis of roll cracking of high-strength automobile beam steel[J].Physics Examination and Testing,2020,38(5):27. |
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| Authors: | LIU Zhi-wei LI Yang LI Zhong-hua [LU]Yao-qiang GAO Yan BAI Min |
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| Affiliation: | Technology Innovation Department， HBIS Laoting Steel Co.， Ltd.， Tangshan 063606， China |
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| Abstract: | The roll cracking phenomenon of 750 MPa high-strength automobile beam steel produced by one company was analyzed by optical microscope (OM) and scanning electron microscope (SEM). The results showed that the adjustment of edge gap of shearing area in slitting shear was not reasonable. There were many burrs and micro-cracks in end face on the side with larger edge gap， which created external conditions for the cracking. During the hot rolling process， the abnormally high temperature of RT2 caused serious mixed crystal of the material. The decrease of toughness was the internal cause for cracking. |
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| Keywords: | large beam steel roll pressing cracking mixed crystal |
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