Improving the ductility in laser welded joints of CoCrFeMnNi high entropy alloy to 316 stainless steel

Oliveira, J.P.; Shamsolhodaei, A.; Shen, Jiajia; Lopes, José Gabriel Pereira; Gonçalves, R. M.; Ferraz, Mariana de Brito; Piçarra, Lourenço; Zeng, Zhi; Schell, Norbert; Zhou, Norman Y.; Kim, Hyoung Seop

doi:10.1016/j.matdes.2022.110717

Cited by 98 publications

(24 citation statements)

References 32 publications

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“…[ 51,52 ] On the contrary, Ni has shown very little tendency to segregation from the liquid in similar HEAs, as its partition coefficient is close to unity. [ 53 ] No preferential texturing of the welded bead appears to have been induced by the directional solidification, as the relative intensities of different reflections in XRD diffractograms are the same as in the BM.…”

Section: Resultsmentioning

confidence: 99%

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

et al. 2022

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The present work explores the feasibility of joining the CoCuFeMnNi high entropy alloy by laser beam welding. An appropriate feasibility window is identified, and the optimal process parameters (300 W power, scanning speed 20 mm s−1, spot size 0.45 mm) are related to the properties of the studied material. Cu's tendency to segregate from other alloying elements is found to dominate the microstructural evolution: the welding process induced the formation of Cu‐rich second phases within the melted zone (MZ), as interdendritic phase, as well as in the heat‐affected zone (HAZ) as grain boundary phase. Mechanical resistance of the welded beads and the HAZs was improved (187 HV on average) over one of the base materials (BMs) (160 HV on average) owing to the formation of Cu‐rich phases and solidification stresses. Consequently, tensile strength (576.4 MPa) and elongation to failure (28.3%) are almost the same as in the BM. Indeed, failure during tensile tests always took place outside the welded bead, therefore confirming the extreme soundness of the performed laser beam welding. Such results confirm that laser welding may be safely applied to relatively complex high entropy alloys (HEA), thus easing their practical application.

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Section: Resultsmentioning

confidence: 99%

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

et al. 2022

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“…Laser welding technology has been widely used because of its high efficiency, high welding quality, high precision, good performance, small heat input and small deformation [1][2][3]. However, the defects of joints, such as porosity and spatter, have been extensively studied by experts.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Effect of Keyhole Instability on Porosity during the Deep Penetration Laser Welding Process

Kang¹,

Zhao²,

Li³

et al. 2022

Metals

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The quality of a laser deep penetration welding joint is closely related to porosity. However, the keyhole stability seriously affects the formation of porosity during the laser welding process. In this paper, a three-dimensional laser welding model with gas/liquid interface evolution characteristics is constructed based on the hydrodynamic interaction between the keyhole and molten pool during the laser welding process. The established model is used to simulate the flow and heat transfer process of molten. The Volume of Fluid (VOF) method is used to study the formation and collapse of the keyhole and the formation of bubbles. It is found that bubbles are easy to form when the keyhole depth abruptly changes. There are three main forms of bubbles formed by keyhole instability. The front wall of the keyhole collapses backward to form a bubble. The back wall of the keyhole inclines forward to form a bubble. The lower part of the keyhole produces a necking-down effect, and the lower part of the keyhole is isolated separately to form a bubble. In addition, when the keyhole does not penetrate the base metal, the stability of the keyhole is high and the percentage of porosity is low.

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“…In recent years, there has been an increased interest in manufacturing 316L stainless steel (SS) parts by BJ3DP, [5,7,[10][11][12][13][14][15] as 316L SS displays appealing properties, that is, outstanding corrosion resistance, [16,17] excellent oxidation resistance, [18,19] and good weldability. [20][21][22] Most of the previous studies are focused almost exclusively on densifying the 316L SS to achieve the desired performance. [23] Undoubtedly, the quality of the green parts printed by BJ3DP will have a crucial influence on the quality of the final parts.…”

Section: Introductionmentioning

confidence: 99%

Binder Jet 3D Printing of 316L Stainless Steel: Orthogonal Printing and Sintering Process Optimization

Chen

et al. 2022

Adv Eng Mater

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Binder jet 3D printing (BJ3DP) is an additive manufacturing technique that uses a liquid binder to selectively deposit powder layer by layer to fabricate 3D parts followed by sintering. Herein, the printing parameters, sintering temperature, and holding time of 316L stainless steel (SS) materials produced by BJ3DP technique are systematically investigated. Based on the L9 orthogonal experimental design, the green parts can achieve the highest relative density of ≈55.9%, when the layer thickness, binder saturation, and roller traverse speed are 150 μm, 35%, and 100 mm s−1, respectively. Five green parts printed using the optimal parameters are subsequently sintered under different temperatures and holding time. All the as‐sintered samples consist of a primary γ‐Fe phase and a small amount of δ‐ferrite phase. After sintering at 1435 °C for 7.5 h, the as‐sintered samples obtain the highest relative density of ≈92.1% along with the most excellent mechanical properties, displaying ultimate tensile strength of ≈558 MPa and an elongation of ≈41%. The mechanical properties of these samples sintered at 1435 °C for 7.5 h are also superior to those of the annealed 316L SS in ASTM A276/A276M‐17.

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Improving the ductility in laser welded joints of CoCrFeMnNi high entropy alloy to 316 stainless steel

Cited by 98 publications

References 32 publications

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

Simulation of the Effect of Keyhole Instability on Porosity during the Deep Penetration Laser Welding Process

Binder Jet 3D Printing of 316L Stainless Steel: Orthogonal Printing and Sintering Process Optimization

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