镍基单晶高温合金一次枝晶间距的统计研究  

Statistics on the Primary Dendrite Spacing of Ni-based Single Crystal Super Alloys

作　　者：刘贵群 冯丽[2] 王贺明 马飞亚 张小丽[1] 杨彦红[3] Liu Guiqun;Feng Li;Wang Heming;Ma Feiya;Zhang Xiaoli;Yang Yanhong(College of Material Science and Engineering,North Minzu University;Electrical Engineering,Shengyang Polytechnic College;Institute of Metal Research,Chinese Academy of Sciences)

机构地区：[1]北方民族大学材料科学与工程学院,银川750021 [2]沈阳职业技术学院电气工程学院 [3]中国科学院金属研究所

出　　处：《特种铸造及有色合金》2021年第2期153-157,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51701210);宁夏回族自治区重点研发计划资助项目(2019BDE03016);第四批“宁夏青年科技人才托举工程资助项目”(TJGC2019048);大学生创新训练计划资助项目(S2020-11407-007)。

摘　　要：采用籽晶法制备了3种[001]取向的镍基单晶高温合金。通过正方形估算法和直接测量法统计了合金不同凝固高度的一次枝晶间距。该方案消除了晶界和晶体学取向对一次枝晶间距的影响。随着凝固高度升高,3种合金的一次枝晶平均间距逐渐增大。两种统计方法的一次枝晶平均间距相近,说明两种方法的精度均较高。此外,3种合金的一次枝晶间距在较大的范围内变化,且呈正态分布。3种合金的一次枝晶间距上限是下限的5.4~8.5倍。Three generation single crystal superalloys(SRR99,DD32 and DD90)were designed by the combination of directional solidification technology and seeding method.The primary dendrite spacings were calculated by the direct measurement method and the square calculation method.The effects of grain boundary and crystallographic orientation on the primary dendrite spacing were eliminated.The average primary dendrite spacings of three superalloys are increased gradually with the increase of solidification heights,and the ones counted by two methods are similar,confirming the accuracy of the two methods.Moreover,the primary dendrite spacings of the superalloys is varied in a large range and present a normal distribution.The upper limit of the primary dendrite spacing is 5.4~8.5 times higher than the lower limit.

关 键 词：定向凝固 籽晶法 单晶高温合金 一次枝晶间距 

分 类 号：TG244[金属学及工艺—铸造]