Crystallographic texture variation in laser beam-welded CoCrFeNiMn

This study examines the crystallographic texture and residual stress variation of a laser-welded CoCrFeNiMnhigh-entropy alloy (HEA) plate. The HEA plate was welded using a disc laser with a maximum power output of 4kW, which was also equipped with a bright line weld module and a dual-core fiber with a diameter of 100 and400 μm, respectively. The welding direction was aligned with the rolling direction. The texture was investigatedvia high-energy X-ray beam and EBSD. To investigate the crystallographic variation in the welded CoCrFeNiMnHEA plate, the textures were examined in the fusion zone (FZ), the heat affected zone (HAZ), and the basematerial (BM). The texture observed in the FZ was a combination of the textures present on ±0.1 mm positionsfrom the weld centerline. The texture identified on each side of the centerline of the FZ comprises fibers oriented〈100〉// to the transverse direction, exhibiting a ± 10◦ rotation around the rolling direction. The textureobserved in the BM exhibits a rolling-type texture, represented by {110}<112> brass, {112}<111> Cu, and{123}<643> S components, with a dominant {110}<112> brass component and a sharpness of 4.8 mrd. Themicrohardness profiles indicate a slight decline in hardness, from 260 HV0.1 for the BM to 240 HV0.1 in the FZ.The mechanical properties of the welded samples exhibited a slight reduction in ultimate tensile strength (from900 ± 15 MPa to 830 ± 10 MPa) and elongation (from 18 ± 3 % to 13 ± 3 %). This decrease in mechanicalproperties could be attributed to the presence of large grains in the FZ, the dissolution of precipitation, andalterations in texture. This alloy displays excellent weldability, making it a promising candidate for engineeringapplications.