TY  - JOUR
AU  - Shen, Jiajia
AU  - Kim, Rae Eon
AU  - Mestre, Martim
AU  - Lopes, Joao
AU  - He, Jingjing
AU  - Yang, Jin
AU  - Zeng, Zhi
AU  - Schell, N.
AU  - Kim, Hyoung Seop
AU  - Oliveira, J. P.
TI  - Unveiling the macrosegregation formation mechanism and its impact on properties in dissimilar welding between CoCrFeMnNi high-entropy alloy and 316 stainless steel
JO  - Journal of materials science
VL  - 60
IS  - 9
SN  - 0022-2461
CY  - Dordrecht [u.a.]
PB  - Springer Science + Business Media B.V
M1  - PUBDB-2025-00756
SP  - 4432 - 4457
PY  - 2025
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001428313100001
DO  - DOI:10.1007/s10853-025-10708-w
UR  - https://bib-pubdb1.desy.de/record/623735
ER  -