抽拉速度对单晶叶片定向凝固过程的影响  

Effect of Withdrawal Rate on Solidification Process of Single Crystal Blades

作　　者：张海华 张鸿 张玲 刘永娜 ZHANG Hai-hua;ZHANG Hong;ZHANG Ling;LIU Yong-na(Military Representative Bureau of Naval in Shenyang,Shenyang 110043,Liaoning,China;Shenyang Liming Aereo-Engine Co.,Ltd.,Shenyang 110043,Liaoning,China;Shenyang Research Institute of Foundry Co.,Ltd.CAM,Shenyang 110022,Liaoning,China)

机构地区：[1]海装沈阳局,辽宁沈阳110043 [2]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [3]中国机械总院集团沈阳铸造研究所有限公司,辽宁沈阳110022

出　　处：《铸造》2023年第2期130-134,共5页Foundry

摘　　要：以DD6高温合金作为单晶叶片试件合金材料,对固定抽拉速度、简单阶梯抽拉速度和多级阶梯抽拉速度下单晶叶片试件温度场、糊状区和凝固组织生长情况进行了数值模拟,并进行了定向凝固验证试验。结果表明:采用低速固定抽拉和多级阶梯抽拉速度能获得单晶完整性好的叶片试件;高速固定抽拉和简单阶梯拉速下单晶叶片试件在缘板产生杂晶;凝固组织数值模拟结果与定向凝固试验结果基本吻合。Taking the DD6 superalloy as the alloy material of single crystal blade specimen,the numerical simulation of the temperature fields,the mushy zones and the solidification microstructure growth of the single crystal blade specimens under the conditions of fixed,simple-step and multi-step withdrawal rates,and the directional solidification experiments were carried out.The results showed that the blades with good single crystal integrity were obtained by using of fixed low-rate withdrawal and multi-step withdrawal rates.The stray grains on the platforms of the blades were produced under the conditions of high-rate withdrawal and simplestep withdrawal rates.The results of numerical simulation of the solidification microstructure were basically in agreement with those of the directional solidification tests.

关 键 词：单晶叶片 定向凝固 抽拉速度 数值模拟 杂晶 

分 类 号：TG111.5[金属学及工艺—物理冶金]