双辊铸轧热-流-组织耦合模拟及铸轧区组织精细分析  

Simulation of thermal-flow-solidification structure coupled in twin-roll casting and elaborate analysis of cast-rolling area solidification structure

作　　者：刘文文 黄华贵[2] LIU Wen-wen;HUANG Hua-gui(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;Advanced Forming and Intelligent Equipment Research Institute,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [3]太原理工大学先进成形与智能装备研究院,山西太原030024

出　　处：《材料热处理学报》2021年第7期126-133,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52005361,51474189)。

摘　　要：以二辊?160 mm×150 mm铸轧机为研究对象,以1060纯铝为材料,利用ProCAST的CA-FE模块,建立了铸轧过程的热-流-组织间接耦合模型,研究了铸轧工艺参数对凝固组织与热变形的影响。基于微小变形率下凝固组织形貌未发生变化的假设,建立了铸轧区凝固组织精细化标准。通过铸轧实验验证了仿真模型的准确性,确定了Kiss点以下高度为1 mm区域作为精细化分析参数统计区的合理性。依据该精细分析标准,给出了铸轧速度、浇铸温度、熔池高度、带坯厚度及液态金属凝固形核率等参数对凝固组织和热变形量的影响规律。发现柱状晶尺寸变化与热变形量的变化具有一致性,仅提升液态金属的形核率,可以有效改变凝固组织尺寸和类型。因此,在铸轧设备能力允许的范围内,同时增大热变形量和凝固形核率是一种提升铸轧铝带质量和性能的方法。Taking a twin-roll experimental caster with dimension of ?160 mm×150 mm as the research object and 1060 pure aluminum as the material, the thermal-flow-solidification structure indirect coupling model of casting process was established using the CA-FE module of ProCAST to research the influence of casting-rolling process parameters on the solidification structure and thermal deformation. Based on the assumption that the morphology of solidification structure will not change under small deformation rate, an elaborate analysis standard for the solidification structure in cast-rolling area was established. Through twin-roll casting experiments, the accuracy of the simulation model was verified, and the rationality of the area below the Kiss point with a height of 1 mm as the statistical area of elaborate analysis parameters was determined. Based on the elaborate analysis standard, the influence of casting-rolling speed, casting temperature, molten pool height, strip thickness, liquid metal solidification nucleation rate on the solidification structure and thermal deformation were presented. It is found that the change of columnar crystal size is consistent with the change of thermal deformation. Only increasing the nucleation rate of liquid metal can effectively change the size and type of solidification structure. Therefore, it is a method to improve the quality and properties of cast rolling aluminum strip by increasing the thermal deformation and solidification nucleation rate at the same time within the allowable range of twin-roll casting rolling equipment.

关 键 词：双辊铸轧 凝固组织 数值模拟 精细分析 CA-FE分析 

分 类 号：TG146.2[一般工业技术—材料科学与工程]