Abstract
In this paper, as-annealed FeCoNiCrMn plates were laser-welded with preplaced FeCoNiCrMn and FeCoNiCrAl powders, respectively. The grains in the fusion zone of the weld with FeCoNiCrMn powder have a reduced aspect ratio compared to those without preplaced powders and the weld with FeCoNiCrAl powder presents relative equiaxed grains. The yield strength of each weld has been remarkably enhanced when referring to the base alloy, and the ultimate tensile strength of each weld with preplaced powder exceeds 80% of that of the base and the maximum reaches 88.5% when referring to the weld with preplaced FeCoNiCrMn powder. Cleavage fractography was observed in the welds. The finding of this work will service the engineering practices of high-entropy alloys.
Highlights
The design concept of high-entropy alloys (HEAs) is out of the limitations in traditional alloys which put the compositions in the corner of phase diagrams, and this kind of novel alloy design approach has been paid much attention in the past two decades [1]
For the strengthening of welds, laser beam welding overcomes the softening of the weld joint of FeCoNiCrMn HEA via the precipitation of the B2 phases during the solidification of the fusion zone and takes advantage of the “intrinsic” hardening of HEAs [12]; Chen et al fabricated a crack- and void-free weld joint of an FeCoNiCrMn HEA by laser welding and disclosed that the Mn-C-rich precipitates facilitate the strengthening of the base by means of the pinning effect on dislocations and boundaries [13]
The yield strength of each weldment has been remarkably enhanced and the maximum value can be reached for W2 (330.5 MPa)
Summary
The design concept of high-entropy alloys (HEAs) is out of the limitations in traditional alloys which put the compositions in the corner of phase diagrams, and this kind of novel alloy design approach has been paid much attention in the past two decades [1]. Laser welding offers a focused heat source and facilitates the formation of a deeply narrow weld zone [6,9,10]. HEAfor has shown applications suitability for laser welding of FeCoNiCrMn. HEA of hasFeCoNiCrMn shown suitability cryogenic cryogenic applications due to the formation deformation twins and dislocations [14]. Changing powders, preplaced powders during welding provide different. Byby changing thethe powders, thethe preplaced powders during thethe welding provide different solutions for enhancing the strength of weld joints. The base, FeCoNiCrMn HEA, laser-welded with powders, and andthe themicrostructures microstructures and was laser-welded withpreplaced preplacedFeCoNiCrMn. FeCoNiCrMn or or FeCoNiCrAl powders, and tensile properties welds were investigated.
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