中锰钢高温热塑性研究  

Study on high temperature thermoplasticity of medium manganese steel

作　　者：陈明昕[1] 杨晓江 孟庆勇 CHEN Ming-xin;YANG Xiao-jiang;MENG Qing-yong(Science and Technology Information Department,Central Iron and Steel Research Institute,Beijing 100081,China;Technology Innovation Department of HBIS Laoting Steel Co.,Ltd.,Tangshan 063606,Hebei,China)

机构地区：[1]钢铁研究总院科技信息与战略研究所,北京100081 [2]河钢乐亭钢铁有限公司技术创新部,河北唐山063606

出　　处：《钢铁研究学报》2020年第6期519-524,共6页Journal of Iron and Steel Research

摘　　要：采用真空感应炉熔炼中锰钢,经铸铁模冷却至室温铸锭内部存在大量的微观裂纹,实验表明中锰钢高温热塑性极差。而采用铸铁模冷却至700℃后,置于700℃马弗炉随炉冷却至室温铸锭内部微观裂纹消失。将试样经过热轧锻造后,中锰钢的热塑性较为良好。研究表明铸锭中柱状晶发达以及凝固过程产生的微观裂纹是造成热塑性极差的主要原因,铸铁模快冷引起的热应力和铸锭完全凝固700℃以后相变应力是造成铸坯内部裂纹的主要因素。生产过程推荐采用结晶器、二冷段相对弱冷工艺措施降低铸坯产生裂纹风险性。After smelting medium manganese steel in vacuum induction furnace,there were a lot of micro cracks in the ingot directly cooled to room temperature in the casting iron mold.The results show that the hot temperature thermoplasticity of medium manganese steel is very poor.However,when the ingot reaches 700℃and is placed in a Muffle furnace at 700℃,the internal micro cracks disappear when the ingot is cooled to room temperature.But the high thermoplasticity of medium manganese steel was also very poor.The results show that the main reasons for the poor thermoplasticity are the development of columnar crystals in ingots and the micro cracks in the solidification process.The thermal stress caused by the rapid cooling of the cast iron die and the transformation stress after the ingot has completely solidified 700℃are the main reasons for the internal cracks.In the production process,it is recommended to adopt the relative weak cooling process of mould and secondary cooling section to reduce the risk of slab crack.

关 键 词：中锰钢 柱状晶 高温热塑性 裂纹 

分 类 号：TF642[冶金工程—钢铁冶金]