Journal Article

PUBDB-2024-07675

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gas tungsten arc welding of CoCrFeMnNi high entropy alloy to 316 stainless steel

Shen, J. (Corresponding author)Extern* ; Kim, R. E. ; He, J. ; Lopes, J.Extern* ; Yang, J. ; Zeng, Z. ; Schell, N.HZG*Hereon* ; Kim, H. S. ; Oliveira, J. P. (Corresponding author)Extern*

2025
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.msea.2024.147664  doi:10.3204/PUBDB-2024-07675

Abstract: In this study, an as-annealed CoCrFeMnNi high entropy alloy (HEA) was successfully gas tungsten arc-welded(GTA-welded) to 316 stainless steel, resulting in a fully penetrated joint and free of visible macroscopic de-fects. In the heat-affected zone (HAZ) on the 316 stainless steel side, a phase transformation from δ-BCC to σphase was detected. On the CoCrFeMnNi side, the base material (BM) primarily exhibited an FCC matrix phase,with a slight increase in Cr-Mn oxide content upon entering the HAZ. The formation of the BCC phase in thefusion zone (FZ) was mainly attributed to the mixing of Fe from the 316 stainless steel. This region exhibited thehighest hardness, resulting from a combination of factors, including the BCC precipitates and minor incorpo-ration of carbon introduced within the FZ, further aided by solid solution strengthening due to BMs mixing, butsolid solution strengthening is the key factor. The BMs and the adjacent HAZs displayed highly similar equiaxedgrain structure and size, and the hardness distributions, making it difficult to distinguish each region. However,the evolution of interplanar spacing obtained through synchrotron X-ray radiation effectively differentiated thevarious regions of the joint. Tensile testing revealed that the strength and hardness of this dissimilar joint werelower than those of both BMs, yet it still shows potential for structural applications. The fracture site of the jointoccurred in the HAZ on the 316 stainless steel side, primarily due to the combined effects of localized largeplastic deformation in the soft region and stress concentration caused by the presence of σ phase

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20210899 EC (I-20210899-EC) (I-20210899-EC)
3. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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