Evolution of residual stress and microstructure in single crystal superalloys via directed energy deposition

doi:10.1016/j.optlastec.2025.112775

IMR OpenIR

	Evolution of residual stress and microstructure in single crystal superalloys via directed energy deposition
	Guo, Yimo 1,2,3; Lu, Nannan1 ; Yang, Yanhong 1; Liang, Jingjing 1; Zhang, Guangrui 1; Li, Jinguo 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
通讯作者	Lu, Nannan(nnlu@imr.ac.cn) ; Liang, Jingjing(jjliang@imr.ac.cn)
	2025-08-01
发表期刊	OPTICS AND LASER TECHNOLOGY
ISSN	0030-3992
卷号	186 页码:12
摘要	Residual stress (RS) was the main driving force for recrystallization during subsequent heat treatment in single crystal (SX) superalloys repaired by directed energy deposition (DED). Understanding RS distribution was the key to avoid recrystallization after heat treatment. In this work, a second-generation SX superalloy DD432 was investigated. Both the primary dendrite arm spacing (PDAS) increased and gamma ' coarsened gradually as the deposition proceeded, due to cooling rate diminution. Stray grains (SGs) and (gamma + gamma ') eutectic were detected in the middle and top regions. Along the build direction, the RS exhibited an increasing trend along with the deposition height, thanks to the layer-by-layer accumulation of RS during DED. Along the horizontal direction, RS distribution was symmetrical. Considering the uneven distribution of the temperature field at the fusion interface, there was compression RS near the edge of both ends, and tensile RS at the remaining positions, which presented an approximately M-shaped symmetrical distribution. The recrystallization distribution after high temperature annealing further verified the relationship between RS and deposition height. This work served as potential guidance for the additive repair of SX turbine blades and their post-treatment.
关键词	Residual stress Recrystallization Directed energy deposition Single crystal superalloy
资助者	National Key Research and Development Program ; Defense Industrial Tech-nology Development Program ; Na-tional Key R & D Program of China ; China Postdoctoral Science Foundation
DOI	10.1016/j.optlastec.2025.112775
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program[2023YFB4604000] ; Defense Industrial Tech-nology Development Program[JCKY2020130C024] ; Na-tional Key R & D Program of China[2017YFA0700704] ; China Postdoctoral Science Foundation[2022M723211]
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Applied
WOS记录号	WOS:001445261900001
出版者	ELSEVIER SCI LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/191966
专题	中国科学院金属研究所
通讯作者	Lu, Nannan; Liang, Jingjing
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China 2.Northeastern Univ, Sch Mat & Engn, Shenyang 110819, Liaoning, Peoples R China 3.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110178, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Guo, Yimo,Lu, Nannan,Yang, Yanhong,et al. Evolution of residual stress and microstructure in single crystal superalloys via directed energy deposition[J]. OPTICS AND LASER TECHNOLOGY,2025,186:12.
APA	Guo, Yimo.,Lu, Nannan.,Yang, Yanhong.,Liang, Jingjing.,Zhang, Guangrui.,...&Sun, Xiaofeng.(2025).Evolution of residual stress and microstructure in single crystal superalloys via directed energy deposition.OPTICS AND LASER TECHNOLOGY,186,12.
MLA	Guo, Yimo,et al."Evolution of residual stress and microstructure in single crystal superalloys via directed energy deposition".OPTICS AND LASER TECHNOLOGY 186(2025):12.