Journal Article

PUBDB-2025-00756

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unveiling the macrosegregation formation mechanism and its impact on properties in dissimilar welding between CoCrFeMnNi high-entropy alloy and 316 stainless steel

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

2025
Springer Science + Business Media B.V Dordrecht [u.a.]

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Please use a persistent id in citations: doi:10.1007/s10853-025-10708-w  doi:10.3204/PUBDB-2025-00756

Abstract: High-entropy alloys (HEAs) are increasingly preferred as structural materials innuclear engineering and aerospace applications. These fields often require thedesign of dissimilar joints. Here, gas tungsten arc welding (GTAW) was used forthe first time to join CoCrFeMnNi HEAs with 316 stainless steel. Microstructuralcharacterization, including electron microscopy, high-energy synchrotron X-raydiffraction, and thermodynamic calculations, along with micro- and macroscalemechanical assessments, was utilized. These methods were instrumental in evaluatingand clarifying the effects of the non-equilibrium solidification and weldthermal cycle on the microstructure evolution of the joint. In the fusion zone(FZ), distinctive peninsula-shaped macroscopic segregation area is observed,with its formation being related to the liquidus temperature differences betweenthe base materials (BMs) and the welded metal, compounded by the Marangonieffect. The weld thermal cycle was found to promote multiple solid-state phasetransformations in the heat-affected zone (HAZ) adjacent to the CoCrFeMnNiBM, leading to varying degrees of softening. The HAZ near the 316 stainless steelBM maintained its original microstructural and mechanical properties. Fracturepredominantly occurred in the FZ, mainly due to the interplay of large columnargrains, macrosegregation effects, and emergence of BCC and σ brittle phases dueto the complex chemistry within this region. Thermodynamic modeling validatedthe formation of these phases. The ultimate tensile strength and elongation atroom temperature were approximately ≈493 MPa and ≈10.70%, respectively.

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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. 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 - Electronics and Telecommunications Collection ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Springer ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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