冷却速率对ZG40CrNi2Mo大型铸件凝固组织及元素偏析的影响  

Effect of Cooling Rate on Solidification Microstructure and Element Segregation of ZG40CrNi2Mo Large Castings

作　　者：邹富康 仲红刚[1] 李莉娟[1] 龚永勇[1] 陈湘茹[1] 翟启杰[1] ZOU Fukang;ZHONG Honggang;LI Lijuan;GONG Yongyong;CHEN Xiangru;ZHAI Qijie(Center for Advanced Solidification Technology,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学先进凝固技术中心,上海200444

出　　处：《热加工工艺》2024年第15期135-140,共6页Hot Working Technology

基　　金：国家重点研发计划资助项目(No.2020YFB2008401)。

摘　　要：为了研究铸件凝固过程中不同冷却速率对其凝固组织与元素偏析的影响,利用铸件凝固过程数值模拟方法和自研的高通量凝固过程热模拟实验装置,开展了ZG40CrNi2Mo优质调质钢在不同冷却速率下的凝固模拟实验。结果表明:ZG40CrNi2Mo调质钢的二次枝晶臂间距λ_(2)与局部凝固时间t的关系符合λ_(2)=36.03 t0.26;随着冷却速率的降低,Cr元素偏析呈现上升趋势,Ni元素偏析先上升后降低;Mo元素偏析最为严重,但是对于冷却速率的变化不敏感。In order to study the effect of different cooling rates on solidification structure and element segregation during casting solidification,the solidification simulation experiments of ZG40CrNi2Mo high-quality quenched and tempered steel under different cooling rates were carried out by using the numerical simulation method of casting solidification process and the self-developed high flux solidification process thermal simulation test device.The results show that the relationship between secondary dendrite arm spacing and local solidification time of ZG40CrNi2Mo quenched and tempered steel is consistent withλ_(2)=36.03 t0.26.With the decrease of cooling rate,Cr segregation shows an upward trend,and Ni segregation first increases and then decreases;Mo element segregation is the most serious,but it is insensitive to the change of cooling rate.

关 键 词：热模拟 数值模拟 冷却速率 凝固组织 二次枝晶臂间距 元素偏析 

分 类 号：TG244[金属学及工艺—铸造]