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Mesoscopic evolution of molten pool during selective laser melting of superalloy Inconel 738 at elevating preheating temperature
Wang, Weihao1; Lin, Wenhun1; Yang, Rui1,2; Wu, Yingna1; Li, Jiapeng1; Zhang, Zhenbo1; Zhai, Zirong1
Corresponding AuthorZhang, Zhenbo(zhangzb1@shanghaitech.edu.cn) ; Zhai, Zirong(zhaizr@shanghaitech.edu.cn)
2022
Source PublicationMATERIALS & DESIGN
ISSN0264-1275
Volume213Pages:18
AbstractDue 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/).
KeywordNumerical investigation Preheating Selective laser melting Inconel 738 Molten pool evolution
Funding OrganizationNSFC ; ShanghaiTech University start-up funding ; CAS Interdisciplinary Innovation Team Project
DOI10.1016/j.matdes.2021.110355
Indexed BySCI
Language英语
Funding ProjectNSFC[52001212] ; ShanghaiTech University start-up funding ; CAS Interdisciplinary Innovation Team Project[JCTD-2020-10]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000740356900007
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/173868
Collection中国科学院金属研究所
Corresponding AuthorZhang, Zhenbo; Zhai, Zirong
Affiliation1.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
Recommended Citation
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.
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