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Laser dissimilar weldability of cast and rolled CoCrFeMnNi high-entropy alloys for cryogenic applications

Title
Laser dissimilar weldability of cast and rolled CoCrFeMnNi high-entropy alloys for cryogenic applications
Authors
Nam, HyunbinPark, SangwonChun, Eun-JoonKim, HyoungseopNa, YoungsangKang, Namhyun
Date Issued
Jul-2019
Publisher
TAYLOR & FRANCIS LTD
Abstract
This study investigates the effects of welding velocity on weldability of dissimilar cast/rolled high-entropy alloys and the applicability of cryogenic temperatures. Cast HEA side of dissimilar weld metal (WM) indicates a larger dendrite packet and dendrite arm spacing (DAS) than rolled WM. Size difference is associated with epitaxial growth from each base metal (BM). As the welding velocity increases (6-10 m min(-1)), shrinkage voids and DASs decreases. Dissimilar welds show tensile properties comparable to cast BM, where there are tensile fractures of dissimilar welds. Cryogenic properties of dissimilar welds are superior to those of room-temperature welds, because deformation twins and dislocation densities are significantly formed at 77 K. Therefore, dissimilar welds can be applied to the production of cryogenic products.
Keywords
Chromium alloys; Cobalt alloys; Cryogenics; Deformation; Dendrites (metallography); Density (specific gravity); Entropy; Iron alloys; Manganese alloys; Mechanical properties; Microstructure; Twinning; Weldability; Welding; Welds; Cryogenic applications; Cryogenic properties; Cryogenic temperatures; Deformation twin; Dendrite arm spacing; Dislocation densities; Dissimilar weld; Tensile fractures; High-entropy alloys
URI
http://oasis.postech.ac.kr/handle/2014.oak/100099
ISSN
1362-1718
Article Type
Article
Citation
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, vol. 25, no. 2, page. 127 - 134, 2019-07
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김형섭KIM, HYOUNG SEOP
Dept of Materials Science & Enginrg
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