| A105连铸坯表面横裂纹形成原因分析 |
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| 作者姓名： | 陶素芬 王福明 李梦龙 金桂香 曹敏 柴国强 |
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| 作者单位： | 1 北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083; |
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| 基金项目： | 国家自然科学基金;中央高校基本科研业务费专项 |
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| 摘 要： | 应用配有能谱仪的场发射扫描电镜分析了A105钢中裂纹处及基体内残余元素Cu、As和Sn以及P含量.应用Thermo-Calc热力学计算软件计算了A105钢的主要析出相以及钢液中P含量随固相质量分数变化关系.应用Gleeble 1500热模拟试验机对A105钢的高温热塑性进行了研究.发现P偏析是该钢产生横裂的主要原因，残余元素Cu、As和Sn在晶界的偏聚加剧了裂纹的形成，矫直温度偏低加速了裂纹的扩展，而裂纹的形成可能与AlN的析出无关，因为析出的AlN很少.
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| 关 键 词： | 连铸 铸坯 表面裂纹 磷 偏析 |
| 收稿时间： | 2013-01-02 |
Surface transverse crack formation study of A105 continuous casting billets |
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| Affiliation: | 1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;3 General Research Institute of Nonferrous Metals in Beijing, Beijing 100088, China |
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| Abstract: | The contents of tramp elements Cu, As and Sn as well as P in A105 continuous casting billets were analyzed by field emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometry (EDS). Main precipitates in the steel and the variation of P content in molten steel with solid fraction were calculated by Thermo-Calc thermodynamic software. The hot ductility of the steel was measured by using a Gleeble 1500 thermal simulator. It is found that P segregation is the main reason for transverse cracking of the steel. The segregation of tramp elements Cu, As and Sn at grain boundaries promotes the formation of cracks. Straightening in a lower temperature zone accelerates crack propagation. AlN precipitation may have nothing to do with the formation of cracks due to little AlN. |
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