Dissimilar laser welding of a CoCrFeMnNi high entropy alloy to 316 stainless steel

Abstract

In this work, laser welding of a rolled CoCrFeMnNi high entropy alloy to 316 stainless steel was performed. Defect-free joints were obtained. The microstructure evolution across the welded joints was assessed and rationalized by coupling electron microscopy, high energy synchrotron X-ray diffraction, mechanical property evaluation, and thermodynamic calculations. The fusion zone microstructure was composed of a single FCC phase, and a hardness increase at this location was observed. Such results can be attributed to the formation of a new solid solution (arising from the mixing of the two base materials). Moreover, the incorporation of carbon in the fusion zone upon melting of the stainless steel also aids in the strengthening effect observed. The welded joints presented good mechanical properties, with fracture occurring at the fusion zone. This can be ascribed to the non-favourable, i.e., large grain size, microstructure that developed at this location.

Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary

“…Previous studies have shown that face-centered cubic (FCC) structured metals with growth nanotwins always exhibit ultrahigh strength and excellent ductility [1][2][3][4][5]. As the mechanical properties of materials are directly related to their deformation mechanisms [6][7][8][9][10][11][12][13][14], revealing the atomic-scale deformation mechanisms of materials is important for understanding their mechanical performance and realizing their desired mechanical properties [11,12,[15][16][17][18]. In recent decades, a large number of studies have been conducted on the deformation mechanisms of twin-structured metals [16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Effect of Alternating Magnetic Field on Arc Plasma Characteristics and Droplet Transfer during Narrow Gap Laser-MIG Hybrid Welding

“…Laser MIG hybrid welding couples a laser beam and an arc into one process. It gives full play to their respective advantages and makes up for the shortcomings of a single heat source, which is a more efficient form of heat source [1][2][3][4]. Compared to conventional laser welding, laser MIG hybrid welding can effectively improve the gap bridging capability, obtain greater weld penetration under the condition of lower laser power, and then realize a stable and high-efficiency welding process.…”

A Novel Alloy Development Approach: Biomedical Equiatomic Ta-Nb-Ti Alloy

“…The modern material class of equiatomic multi-component alloys, especially highentropy alloys (HEAs), has gained tremendous attention in the scientific community over recent years [1][2][3], which can be attributed to two main reasons. Firstly, the new concept of combining several elements (at least 5 principal elements with concentrations between 5 and 35 at.…”