冷却条件对TC6合金温度场和Cr偏析的影响  

Effect of Cooling Conditions on the Temperature Field and Macrosegregation of Cr Element of TC6 Alloy Ingot

作　　者：王阳阳 刘向宏[1,2,3] 夏勇 赵小花 吴伟[1] 何永胜 Wang Yangyang;Liu Xianghong;Xia Yong;Zhao Xiaohua;Wu Wei;He Yongsheng(Western Superconducting Technologies Co.,Ltd,Xi’an 710018,China;National&Local Joint Engineering Laboratory for Special Titanium Alloy Processing Technologies,Xi’an 710018,China;Xi’an Key Laboratory of Special Titanium Alloy Processing and Simulation Technologies,Xi’an 710018,China)

机构地区：[1]西部超导材料科技股份有限公司,陕西西安710018 [2]特种钛合金材料制备技术国家地方联合工程实验室,陕西西安710018 [3]西安市特种钛合金制备及仿真技术重点实验室,陕西西安710018

出　　处：《稀有金属材料与工程》2023年第12期4245-4250,共6页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2018YFB1106000)。

摘　　要：采用多场耦合重熔工艺仿真软件MeltFlow-VAR建立数值模型,研究了工业化大规格TC6合金在不同冷却条件下的温度场和Cr元素偏析行为,并通过制备Ф640 mm规格TC6合金铸锭进行验证。模拟结果表明:增大铸锭和坩埚间的换热后,铸锭熔池和糊状区深度变浅,整体呈现自下而上的顺序凝固,Cr元素偏析范围及整锭极差减小。结合实验验证表明:采用壁厚减薄的异形坩埚加强冷却后,凝固组织转变为全柱状晶,有利于减轻偏析,得到成分均匀性较高的铸锭。The influence of cooling conditions on the temperature field and macrosegregation of Cr element of TC6 alloy ingot was investigated by the multi-field coupling remelting technique software MeltFlow-VAR.In order to validate the agreement between the model and experiment results,a full-scale TC6 ingot(Φ640 mm)was prepared.The simulation results show that with increasing of the heat transfer between ingot and crucible,the depth of molten pool and mushy zone of ingot becomes shallower,and the whole ingot is solidified in a bottom-up sequence,which leads to the reduction in segregation area and range of Cr element.The experimental results show that the solidified macrostructure is composed of full-columnar grains by the irregular crucible with reduced wall thickness,which is beneficial to reduce segregation and obtain high quality ingot.

关 键 词：TC6合金 冷却条件 温度场 凝固组织 Cr偏析 

分 类 号：TG146.23[一般工业技术—材料科学与工程]