摘要
为了探索合适的外延激光金属成形(E-LMF)工艺沉积块状镍基单晶高温合金,选择了合适的激光功率、扫描速度、冷却方式组成了九组实验,得到了合适的工艺组合并研究了微观组织演变及形成机理。结果表明:在500 W,13 mm/s, 3 g/min及一般水冷的工艺下可以实现无裂纹的连续外延生长;过大的冷却速度会导致过大的热应力从而诱发裂纹的产生;主体区域为外延生长区,在表面和两端存在非外延生长区。
To explore a suitable epitaxial laser metal forming(E-LMF)process for depositing nickel-based single crystal superalloy blocks, we selected suitable laser power, scanning speed, and cooling methods to form nine sets of experiments on the basis of previous experiments.We obtained a suitable process combination and studied the evolution and formation mechanism of the microstructure.The results showed that: proper heat input and cooling methods can achieve crack-free continuous epitaxial growth;excessive cooling rate will lead to excessive thermal stress and thus induce cracks;the main regions are epitaxial growth regions, and there are non-epitaxial growth regions at the surface and both ends.
作者
李文杰
汪力
陈志国
LI Wen-jie;WANG Li;CHEN Zhi-guo(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Department of Materials Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2022年第9期1342-1347,共6页
Laser & Infrared
基金
湖南省双一流学科建设规划与湖南省应用基础研究重点规划项目(No.2016JC2007)资助。
关键词
外延激光金属成形
镍基单晶高温合金
微观组织演变
连续外延生长
裂纹
epitaxial laser metal forming
nickel-based single crystal superalloy
microstructure evolution
continuous epitaxial growth
crack
