On the orientation dependent microstructure and mechanical behavior of Hastelloy X superalloy fabricated by laser powder bed fusion

doi:10.1016/j.msea.2022.143208

CORC > 金属研究所 > 中国科学院金属研究所

	On the orientation dependent microstructure and mechanical behavior of Hastelloy X superalloy fabricated by laser powder bed fusion
	Huang, Ziliang 2; Zhai, Zirong 2; Lin, Wenhu 2; Chang, Hai 2; Wu, Yingna 2; Yang, Rui 1,2; Zhang, Zhenbo 2
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2022-06-02
卷号	844 页码:14
关键词	Laser powder bed fusion Hastelloy X Anisotropy Mechanical properties Orientation dependent
ISSN号	0921-5093
DOI	10.1016/j.msea.2022.143208
通讯作者	Zhang, Zhenbo(zhangzhb1@shanghaitech.edu.cn)
英文摘要	Ni-based superalloys fabricated by laser powder bed fusion (LPBF) have shown great potential in various in-dustrial sectors with demanding environments, but limited understanding of the microstructure-property rela-tionship of the LPBF fabricated alloys hinders their practical applications. In this study, Ni-based superalloy Hastelloy X (HX) was manufactured by LPBF, and the resulting microstructure was characterized using multi-scale correlative microscopy and its relationships with mechanical behaviors were investigated. A typical cellular structure formed during LPBF, and cell walls enriched with Cr and Mo and contained a high density of dislo-cations. Most of cell boundaries had very low misorientation angles, and misorientation accumulation across a bundle of cells was observed. Correlative microscopic characterizations demonstrated that epitaxial cell growth across molten pool boundaries between adjacent layers and side-branching between neighboring tracks resulted in the formation of a strong Goss texture. Mechanical testing showed that the fabricated HX alloy exhibited a lower strength and a higher tensile ductility along the building direction, compared to those along transverse directions. The governing mechanism for the strength anisotropy was the anisotropic columnar grain structure, and the better tensile ductility was caused by the higher tendency in forming mechanical twins of Goss-oriented grains and lower vulnerability in microcrack propagation during tensioning. More importantly, a very pro-nounced anisotropy in plasticity was found, where macroscopic shape change from circular to highly elliptical was observed in the sample after tensioning along the building direction. A model based on the orientation-dependent dislocation activity that resulted in a planar strain during tensioning was proposed to interpret the anisotropic plastic deformation.
资助项目	National Natural Science Foundation of China[52001212] ; ShanghaiTech University Startup fund
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000797497300001
资助机构	National Natural Science Foundation of China ; ShanghaiTech University Startup fund
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/174004]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, Zhenbo
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.ShanghaiTech Univ, Ctr Adapt Syst Engn, Sch Creat & Art, Shanghai 201210, Peoples R China
推荐引用方式 GB/T 7714	Huang, Ziliang,Zhai, Zirong,Lin, Wenhu,et al. On the orientation dependent microstructure and mechanical behavior of Hastelloy X superalloy fabricated by laser powder bed fusion[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,844:14.
APA	Huang, Ziliang.,Zhai, Zirong.,Lin, Wenhu.,Chang, Hai.,Wu, Yingna.,...&Zhang, Zhenbo.(2022).On the orientation dependent microstructure and mechanical behavior of Hastelloy X superalloy fabricated by laser powder bed fusion.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,844,14.
MLA	Huang, Ziliang,et al."On the orientation dependent microstructure and mechanical behavior of Hastelloy X superalloy fabricated by laser powder bed fusion".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 844(2022):14.