Microstructure evolution and mechanical behavior of a heat-treated Ni-based superalloy AMSC-DB fabricated by laser direct energy deposition

doi:10.1016/j.jallcom.2025.179382

IMR OpenIR

	Microstructure evolution and mechanical behavior of a heat-treated Ni-based superalloy AMSC-DB fabricated by laser direct energy deposition
	Yu, Hao 1; Hu, Yanzhen 1; Chen, Shaofeng 2; Liang, Jingjing 2; Li, Jinguo 2; San-Martin, David 3; Xu, Wei 1
通讯作者	Xu, Wei(xuwei@ral.neu.edu.cn)
	2025-04-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	1021 页码:14
摘要	The microstructure and mechanical behavior of a printable AMSC-DB superalloy fabricated by laser direct energy deposition (LDED) have been systematically investigated in this work. The microstructural evolution of alloy samples was characterized in their as-printed (AP), direct-aged (DA) and solutioned and aged (SA) states, with the tensile tests conducted at both ambient temperature and 900 degrees C. The gamma' precipitates in AP condition are small and round in shape, whereas in the DA condition they show a significant bimodal particle size distribution. In contrast, in the SA condition the gamma' particles possess the well-assembled uniform cubic shape. The carbides in the AP and the DA conditions display similar spatial skeleton structure; however, in the SA condition the carbides undergo partial dissolution turning into a structure of isolated particles. The tensile test results at ambient temperature show that the AP condition possess the highest UTS of around 1237 MPa, superior to the DA and SA conditions. Meanwhile, best ductility can be obtained in SA condition, with the total elongation reaching 22.1 %. The fracture analysis of the samples in all conditions after tensile testing confirm that ductile fracture is the dominant failure mode. The dislocation pairs shearing gamma' particles are consistently detected as the main deformation mechanism, while stacking faults are exclusively observed in small-size gamma' phases in AP and DA conditions. For the mechanical properties at 900 degrees C, samples treated under the SA condition show the highest UTS of 585 MPa with the lowest elongation of 7.7 %, while the AP condition presents the highest ductility with the lowest strength. The fracture surfaces of samples in the AP, DA and SA conditions present semi-brittle features at 900 degrees C test. Well-aligned gamma' particles in SA condition more effectively hinder the dislocation gliding and climbing, facilitating the localized dislocation accumulation. The present work provides insights into the microstructures and mechanical responses obtained via different post-printing processing strategies in Ni-based superalloys fabricated by additive manufacturing.
关键词	Additive manufacturing Ni superalloys Microstructure Deformation mechanism
资助者	National Key Research and Developement Program ; Na-tional Natural Science Foundation of China
DOI	10.1016/j.jallcom.2025.179382
收录类别	SCI
语种	英语
资助项目	National Key Research and Developement Program[2021YFB3702502] ; Na-tional Natural Science Foundation of China[52204383]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001443824800001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/191940
专题	中国科学院金属研究所
通讯作者	Xu, Wei
作者单位	1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Superalloys Div, Shenyang 110016, Peoples R China 3.Natl Ctr Met Res CENIM CSIC, Dept Phys Met, MATERALIA Res Grp, Avda Gregorio del Amo, Madrid 28040, Spain
推荐引用方式 GB/T 7714	Yu, Hao,Hu, Yanzhen,Chen, Shaofeng,et al. Microstructure evolution and mechanical behavior of a heat-treated Ni-based superalloy AMSC-DB fabricated by laser direct energy deposition[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2025,1021:14.
APA	Yu, Hao.,Hu, Yanzhen.,Chen, Shaofeng.,Liang, Jingjing.,Li, Jinguo.,...&Xu, Wei.(2025).Microstructure evolution and mechanical behavior of a heat-treated Ni-based superalloy AMSC-DB fabricated by laser direct energy deposition.JOURNAL OF ALLOYS AND COMPOUNDS,1021,14.
MLA	Yu, Hao,et al."Microstructure evolution and mechanical behavior of a heat-treated Ni-based superalloy AMSC-DB fabricated by laser direct energy deposition".JOURNAL OF ALLOYS AND COMPOUNDS 1021(2025):14.