中文版 | English
Title

Marangoni flow patterns of molten pools in multi-pass laser cladding with added nano-CeO2

Author
Corresponding AuthorWang,Gang; Di,Yuelan
Publication Years
2022-11-01
DOI
Source Title
ISSN
2214-8604
EISSN
2214-8604
Volume59
Abstract
Adding rare-earth elements has been proven to modify the microstructure and enhance the mechanical properties of the laser cladding layer. However, the effect of such elements on the flow pattern in molten pools has not been extensively determined, especially for multi-pass laser cladding. The surface tension of T15 high speed steel and nano-CeO mixed powders is measured using the sessile drop method. Comparing the results from the high-speed photography of the molten pool flow and the multicomponent multiphase flow model, various Marangoni flows driven by surface tension are elucidated, and the cross-section of the multi-pass cladding is further analyzed. The surface tension increases with increasing CeO content. When CeO is less than 0.6 wt%, the surface tension monotonically increases with increasing temperature, and the molten pool flows inward. When CeO is greater than 0.6 wt%, the surface tension decreases at high temperatures, and the molten pool exhibits double flows. In multi-pass laser cladding, the inclination of the molten pool increases on adding CeO. Consequently, the inclined angle of the cladding pass interface increases, and the fusion line on the substrate tends to be straightened. At 0.9 wt% CeO, the added powders remain at the center of the molten pool because of a low velocity, creating a low-temperature zone. The temperature coefficient of surface tension demonstrates a positive–negative–positive distribution from the center to the surrounding pool surface, thus forming an outflow. The solidus point of the cladding alloys is lower than that of the substrate, resulting in a small indentation at the remelted region between passes, which increases the interfacial zone.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
Funding Project
National Natural Science Foundation of China[52075282];National Natural Science Foundation of China[52175207];
WOS Research Area
Engineering ; Materials Science
WOS Subject
Engineering, Manufacturing ; Materials Science, Multidisciplinary
WOS Accession No
WOS:000874899300003
Publisher
Scopus EID
2-s2.0-85138452597
Data Source
Scopus
Citation statistics
Cited Times [WOS]:2
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/402661
DepartmentDepartment of Mechanical and Energy Engineering
Affiliation
1.State Key Laboratory of Tribology & Institute of Manufacturing Engineering,Department of Mechanical Engineering,Tsinghua University,Beijing,100084,China
2.Mechanical and Energy Engineering Department,Southern University of Science and Technology,Shenzhen,518055,China
3.Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control,Tsinghua University,Beijing,100084,China
4.National Key Laboratory for Remanufacturing,Army Academy of Armored Forces,Beijing,100072,China
First Author AffilicationDepartment of Mechanical and Energy Engineering
Recommended Citation
GB/T 7714
Liu,Lichao,Wang,Gang,Ren,Ke,et al. Marangoni flow patterns of molten pools in multi-pass laser cladding with added nano-CeO2[J]. Additive Manufacturing,2022,59.
APA
Liu,Lichao.,Wang,Gang.,Ren,Ke.,Di,Yuelan.,Wang,Liping.,...&Wang,Haidou.(2022).Marangoni flow patterns of molten pools in multi-pass laser cladding with added nano-CeO2.Additive Manufacturing,59.
MLA
Liu,Lichao,et al."Marangoni flow patterns of molten pools in multi-pass laser cladding with added nano-CeO2".Additive Manufacturing 59(2022).
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