Impact of Arc‐Based Welding on the Microstructure Evolution and Mechanical Properties in Newly Developed Cr_29.7Co_29.7Ni_35.4Al₄Ti_1.2 Multi‐Principal Element Alloy

Abstract

Multi‐principal element alloys (MPEAs) have been subjected to extensive research due to their promising potential for numerous applications. Up to now, most of the existing research has been focused on unraveling the microstructural evolution and describing the exceptional performance of these alloys when exposed to demanding environments. Nevertheless, it is especially important to understand their processability so that these advanced engineering alloys can be considered for real‐life applications where conventional manufacturing processes, such as welding, are widely used. Herein, gas tungsten arc welding (GTAW) is used for similar welding of a recently developed precipitation‐hardened Cr29.7Co29.7Ni35.4Al4Ti1.2 MPEA. The microstructural evolution and resulting mechanical properties are characterized by combining optical and electron microscopy, synchrotron X‐ray diffraction, microhardness mapping, and tensile testing. The different microstructure features across the welded joint are correlated to the weld thermal cycle and resulting local mechanical properties. Overall, the Cr29.7Co29.7Ni35.4Al4Ti1.2 MPEA exhibits excellent weldability and mechanical properties, reaching a tensile strength of ≈750 MPa and a fracture strain of ≈33% during tensile tests, making this alloy viable for structural applications. The innovative aspect of this work includes the expansion of the current understanding on the physical metallurgy of MPEAs, as well as the examination of this particular MPEA's processability.

Environmental and Economic Analyses of TIG, MIG, MAG and SMAW Welding Processes

“…Using a filler material of 308 stainless steel [5]. In addition to other related studies [6,7]. Other criteria to be highlighted are resistance both to stress and to the conditions to which welds may be subjected, aesthetic criteria depending on the applications and final uses of the products to be welded, environmental criteria in terms of consumption and inputs, and, of key importance, economic criteria.…”

Effect of Weld Design of Transition Layer on Microstructure and Properties of Welded Joints of S32304/Q390C Composites

“…However, only limited studies have focused on the effect of weld morphology of the transition layer of stainless steel/low alloy high strength steel composite on the microstructure and properties of welded joints. Plasma arc welding, submerged arc welding, and gas tungsten arc welding have the advantages of low production cost, high welding efficiency, stable weld quality, and good applicability [29,30]. At present, they are the main welding methods of stainless steel and low alloy high strength steel composite materials in industry.…”

In-situ microstructural evolution during tensile loading of CoCrFeMnNi high entropy alloy welded joint probed by high energy synchrotron X-ray diffraction

“…This, combined with the fact that the (2 0 0) peak is the crystallographic equivalent to the easy growth direction of FCC metals (corresponding to the (0 0 1) planes), provides the means for these grains to be oriented in a higher fraction towards the LD. 22 Additionally, beyond the aforementioned characteristics of the (3 1 1) peak, the (2 0 0) reflection corresponds to the softest plane in FCC material, 23 meaning that, of all the visible diffraction peaks, it showcases the higher deformation values with increasing levels of stress. On a qualitative basis, at 0 MPa for the (2 0 0) peak, the LD lattice strain distribution is lower in HAZ tending to increase towards the BM and the FZ.…”