The microstructure and precipitated phase dependence of plastic deformation and fracture mechanism in repaired IN718 alloy by directed energy deposition

doi:10.1016/j.jallcom.2024.174466

IMR OpenIR

	The microstructure and precipitated phase dependence of plastic deformation and fracture mechanism in repaired IN718 alloy by directed energy deposition
	Zhang, Yiting 1; Lan, Liangyun 1,2; Shi, Quanqiang 3
通讯作者	Lan, Liangyun(lanly@me.neu.edu.cn)
	2024-06-30
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	990 页码:12
摘要	This work studied microstructural evolution, precipitate behaviors, and micro-hardness distribution along the built direction of directed energy deposited IN718 alloy. In combination with digital image correlation and crystallographic orientation analysis, the plastic deformation and fracture mechanisms of coarse columnar grains were explored in detail. The columnar grains in the deposition zone (DZ) grow along the <001> direction in the crystallography and gradually widen with increasing built height. The misorientation angle per unit length within individual columnar grains first decreases and then slows down to similar to 0.07 degrees/mu m when the deposition height is similar to 1.8 mm. The micro-hardness in the DZ is gradually decreased along the built direction, which may be due to the increasing average columnar grain width and primary dendrite arm spacing, as well as reducing the volume fraction of the gamma" + gamma' phases. During the uniaxial tensile loading, most plastic deformation always occurs in the DZ irrespective of the lowest hardness in the heat-affected zone (HAZ). The nucleation of microvoids is ascribed to the granular Laves phase debonding from the gamma matrix. The number of microvoids gradually decreases with increasing distance from the fracture surface, which may be attributed to the strain-controlled nucleation of microvoids. EBSD results substantiated that the columnar grains near the fracture surface occur to severe lattice rotation, leading to the Kernel misorientation angle distribution in each grain interior increasing to about 1 degrees similar to 4 degrees.
关键词	Repaired IN718 alloy Microstructural evolution Precipitate behaviors Plastic deformation Fracture mechanism
资助者	National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China
DOI	10.1016/j.jallcom.2024.174466
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51605084] ; Fundamental Research Funds for the Central Universities of China[N2103021]
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:001229183300001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/186508
专题	中国科学院金属研究所
通讯作者	Lan, Liangyun
作者单位	1.Northeastern Univ, Sch Mech Engn & Automat, Shenyang 110819, Liaoning, Peoples R China 2.Northeastern Univ, Key Lab Vibrat & Control Aeroprop Syst, Minist Educ China, Shenyang 110819, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yiting,Lan, Liangyun,Shi, Quanqiang. The microstructure and precipitated phase dependence of plastic deformation and fracture mechanism in repaired IN718 alloy by directed energy deposition[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2024,990:12.
APA	Zhang, Yiting,Lan, Liangyun,&Shi, Quanqiang.(2024).The microstructure and precipitated phase dependence of plastic deformation and fracture mechanism in repaired IN718 alloy by directed energy deposition.JOURNAL OF ALLOYS AND COMPOUNDS,990,12.
MLA	Zhang, Yiting,et al."The microstructure and precipitated phase dependence of plastic deformation and fracture mechanism in repaired IN718 alloy by directed energy deposition".JOURNAL OF ALLOYS AND COMPOUNDS 990(2024):12.