| 中碳钢高温力学和冶金行为 |
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| 引用本文： | 孙彦辉,倪有金,许中波,蔡开科.中碳钢高温力学和冶金行为[J].北京科技大学学报,2009,31(6). |
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| 作者姓名： | 孙彦辉 倪有金 许中波 蔡开科 |
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| 作者单位： | 北京科技大学冶金与生态工程学院,北京,100083 |
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| 摘 要： | 采用Gleeble 1500热模拟机对CSP生产的SS400、Q235B和Q345B钢的热塑性进行了研究.结果发现,所研究的钢存在两个低塑性区,即凝固脆性温区(Tm～1 310℃)和低温脆性温区(850～725℃).试样断口金相和成分分析表明:产生凝固脆性温区的原因主要是高温下枝晶间有害元素S、P和O富集形成液膜;产生低温脆性温区的原因主要是奥氏体晶界出现铁素体薄膜以及细小AlN析出造成连铸坯的塑性降低.根据研究结果,提出了改善钢的热塑性防止铸坯裂纹的工艺建议.
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| 关 键 词： | 薄板坯 中碳钢 高温力学性能 CSP工艺 |
Mechanical and metallurgy behaviour of medium carbon steel |
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| SUN Yan-hui,NI You-jin,XU Zhong-bo,CAI Kai-ke.Mechanical and metallurgy behaviour of medium carbon steel[J].Journal of University of Science and Technology Beijing,2009,31(6). |
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| Authors: | SUN Yan-hui NI You-jin XU Zhong-bo CAI Kai-ke |
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| Abstract: | The hot ductility of SS400, Q235B, Q345B steels produced by CSP process was investigated with a Gleeble 1500 testing machine, the results show that the steels have two low ductility zones. The first zone was founded in the range from T_m to 1310℃ and the second zone in the range from 850 to 725℃ . Low ductility and strength in the first zone is due to the presence of liquid films in interdendritic regions which result from sulfur, phosphorus and oxygen segregation between dendrites. The two main reasons for low ductility in the second zone are A1N precipitation and network-shape ferrite formation at grain boundaries. Based on the results, some measures were given to improve the hot ductility of medium carbon steel for preventing slab cracks. |
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| Keywords: | thin slab medium carbon steel high temperature mechanical properties CSP process |
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