Journal Article

PUBDB-2024-01639

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synergistic effects of Monel 400 filler wire in gas metal arc welding of CoCrFeMnNi high entropy alloy

Shen, J. (Corresponding author)Extern* ; Taek Choi, Y. ; Gonçalves, R. ; Schell, N.HZG*Hereon* ; Yang, J.Extern* ; Zeng, Z. ; Catarina Baptista, A. ; Seop Kim, H. ; Oliveira, J. P. (Corresponding author)Extern*

2024
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.matdes.2024.112996  doi:10.3204/PUBDB-2024-01639

Abstract: this study, gas metal arc welding was performed to join an as-rolled CoCrFeMnNi high entropy alloy using Monel400 as the filler wire. The present research findings demonstrate a favorable metallurgical chemical reactionbetween the Monel 400 filler and the CoCrFeMnNi high entropy alloy, resulting in compositional mixing withinthe fusion zone that promotes a solid-solution strengthening effect, counteracting the typical low hardnessassociated to the fusion zone of these alloys. The weld thermal cycle induced multiple microstructure changesacross the joint, including variations in the grain size, existing phases and local texture. The grain size was seento increase from the base material toward the fusion zone. An FCC matrix and finely sparse Cr-Mn-based oxidesexisted in both base material and heat affected zone, while in the fusion zone new FCC phases and carbides wereformed upon the mixing of the Monel 400 filler. The role of the filler material on the fusion zone microstructureevolution was rationalized using thermodynamic calculations. Texture shifted from a γ-fiber (in the base material)to a strong cubic texture in the fusion zone. Digital image correlation during tensile testing to fracturecoupled with microhardness mapping revealed that, stemming from the process-induced microstructure changes,the micro and macromechanical response differed significantly from the original base material. This studysuccessfully established a correlation between the impact of the process on the developed microstructural featuresand the resultant mechanical behavior, effectively assessing the processing-microstructure-properties relationshipstowards an improved understanding of the physical metallurgy associated to these advancedengineering alloys. In conclusion, this work provides an important theoretical framework and practical guidancefor optimizing the engineering applications of high entropy alloys.

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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 2024

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Database coverage:
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