圆坯凝固传热-应力耦合模型的建立与优化分析  

Establishment and optimizing analysis of thermo-mechanical coupling model of continuous casting round billet solidification

作　　者：朱新华[1,2] 朱立光 孟娜 孙向东 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]华北理工大学冶金与能源学院,河北唐山063009

出　　处：《材料热处理学报》2015年第10期248-254,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51074063)

摘　　要：为了解决37Mn5连铸圆坯皮下裂纹问题,采用FCA方法和全程间接耦合法建立了连铸圆坯热力耦合模型,并结合现场数据,模拟分析了铸坯传热行为和应力分布,揭示了铸坯缺陷产生的原因,提出了相应的改进措施,为优化生产工艺提供了理论依据。结果表明,将原二冷各段水量分配比例调整为18∶28∶30∶24后,铸坯表面最大回温由原来的185℃降至8℃,铸坯表面的最大总应变较优化前降低了0.00067,消除了连铸坯皮下裂纹缺陷,铸坯质量得到明显改善。In order to eliminate subsurface cracks in continuous casting round billet of 37Mn5 steel,a thermo-mechanical coupling model for the continuous casting round billet was established by FCA method and indirect coupling method. Based on the field data,the heat transfer process and the stress distribution of the billet were analyzed with the model. The causes of defects in the bullets were revealed,and corresponding improvement measures were also proposed,so it can provide a theoretical basis for optimizing the production process.The results show that the maximum surface reheat of the billet is reduced from 185 ℃ to 85 ℃,and the surface maximum total strain is decreased by 0. 00067 after the cooling segment water proportion changing into 18 ∶ 28 ∶ 30 ∶ 24. The subsurface cracks in the continuous casting round billet are eliminated,and the quality of the billet is significantly improved.

关 键 词：37Mn5钢 凝固 热-力耦合模型 铸坯质量 

分 类 号：TG142.14[一般工业技术—材料科学与工程]