Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature

doi:10.1016/j.matdes.2021.110355

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	Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature
	Wang, Weihao 1; Lin, Wenhun 1; Yang, Rui 1,2; Wu, Yingna 1; Li, Jiapeng 1; Zhang, Zhenbo 1; Zhai, Zirong 1
刊名	MATERIALS & DESIGN
	2022
卷号	213 页码:18
关键词	Numerical investigation Preheating Selective laser melting Inconel 738 Molten pool evolution
ISSN号	0264-1275
DOI	10.1016/j.matdes.2021.110355
通讯作者	Zhang, Zhenbo(zhangzb1@shanghaitech.edu.cn) ; Zhai, Zirong(zhaizr@shanghaitech.edu.cn)
英文摘要	Due to the poor weldability of Inconel 738 alloy, defects (cracks, pores) always exist in the selective laser melting(SLM) process. In this paper, the molten pool evolution of the single track, including the morphology, porosity and crack formation, was systematically investigated by numerical simulation, and the effects of different preheating temperature and process parameters were verified by experimental analysis. The detailed temperature-dependent thermal physical properties were applied into the Volume of Fluid (VOF) method to simulate a powder bed computational domain which was established by Discrete Element Model (DEM). The simulation results show that the change of molten pool width by different laser power and preheating was not as significant as that of depth. The results also demonstrate that higher energy density and preheating temperature induced the generation of pores at the bottom of molten pool, which can be explained by the variation in cooling rates . Moreover, the change of temperature gradients in threedimensional directions with the increase of preheating temperature was also investigated, which explained the reason for crack forming and extending through the center line. Finally, the evolution of molten pool at a higher preheating temperature 1000celcius was simulated to further underpin the positive effect of preheating on preventing cracks formation. (c) 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
资助项目	NSFC[52001212] ; ShanghaiTech University start-up funding ; CAS Interdisciplinary Innovation Team Project[JCTD-2020-10]
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000740356900007
资助机构	NSFC ; ShanghaiTech University start-up funding ; CAS Interdisciplinary Innovation Team Project
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/173867]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, Zhenbo; Zhai, Zirong
作者单位	1.Shanghaitech Univ, Ctr Adapt Syst Engn, Sch Creat & Arts, 393 Middle Huaxia Rd, Pudong 201210, Shanghai, Peoples R China 2.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Wang, Weihao,Lin, Wenhun,Yang, Rui,et al. Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature[J]. MATERIALS & DESIGN,2022,213:18.
APA	Wang, Weihao.,Lin, Wenhun.,Yang, Rui.,Wu, Yingna.,Li, Jiapeng.,...&Zhai, Zirong.(2022).Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature.MATERIALS & DESIGN,213,18.
MLA	Wang, Weihao,et al."Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature".MATERIALS & DESIGN 213(2022):18.