scholarly journals Dissimilar welding of high-entropy alloy to Inconel 718 superalloy for structural applications

2021 ◽  
Author(s):  
R. Sokkalingam ◽  
B. Pravallika ◽  
K. Sivaprasad ◽  
V. Muthupandi ◽  
K. G. Prashanth
Keyword(s):  
Weld Metal ◽  
Inconel 718 ◽  
Dissimilar Materials ◽  
Dissimilar Welding ◽  
High Entropy Alloy ◽  
Laves Phases ◽  
High Entropy ◽  
Dissimilar Weld ◽  
Gas Tungsten Arc ◽  
Structural Applications

AbstractHigh-entropy alloy, a new generation material, exhibits superior structural properties. For high-temperature applications, where dissimilar materials are in demand, HEAs may be joined with commercially available structural materials to improve their performance-life ratio. In this connection, a dissimilar joint was fabricated by gas tungsten arc welding between Al0.1CoCrFeNi-HEA and Inconel 718. The columnar dendritic grains are growing epitaxially at the Al0.1CoCrFeNi-HEA/weld metal interface, where their compositions are matching. While the composition misfit at the weld metal/Inconel 718 interface, reveals the non-epitaxial mode of solidification. In addition, the fusion zone exhibits the porosity and micro-segregation of NbC and Laves phases. The joint shows a joint efficiency of ~ 88%, where the strength is observed to be 644 MPa with 21% ductility. The results demonstrate the applicability of GTAW in fabricating the dissimilar weld joints between HEA and Inconel 718 for structural applications. Graphic abstract

scholarly journals Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 431
Author(s):  
Bharat Gwalani ◽  
Tianhao Wang ◽  
Abhinav Jagetia ◽  
Sindhura Gangireddy ◽  
Saideep Muskeri ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Deformation ◽  
Shear Bands ◽  
Shear Loading ◽  
High Entropy Alloy ◽  
Local Dynamic ◽  
Dynamic Shear ◽  
High Entropy ◽  
Structural Applications

Lamellar eutectic structure in Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc + B2 microstructure with high flow stresses > 1300 MPa under quasi-static tensile deformation and >10% ductility. The response to shear loading was not investigated so far. This is the first report on the shear deformation of a eutectic structured HEA and effect of precipitation on shear deformation. A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local dynamic shear response of the alloy. The change in the width of shear bands with respect to precipitation and deformation rates was studied. The precipitation of L12 phase did not delay the formation of adiabatic shear bands (ASB) or affect the ASB width significantly, however, the deformed region around ASB, consisting of high density of twins in fcc phase, was reduced from 80 µm to 20 µm in the stronger precipitation strengthened condition. We observe dynamic recrystallization of grains within ASBs and local mechanical response of individual eutectic lamellae before and after shear deformation and within the shear bands was examined using nano-indentation.

Microstructures and Wear Resistance of Al1.5CrFeNiTi0.5 and Al1.5CrFeNiTi0.5W0.5 High Entropy Alloy Coatings Manufactured by Laser Cladding

2019 ◽  
Vol 956 ◽  
pp. 154-159 ◽  
Author(s):  
Hui Liang ◽  
Bing Yang Gao ◽  
Ya Ning Li ◽  
Qiu Xin Nie ◽  
Zhi Qiang Cao
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Dendritic Structure ◽  
Laves Phase ◽  
High Entropy Alloy ◽  
Second Phase ◽  
Laves Phases ◽  
High Entropy ◽  
Two Phases ◽  
Bcc Phase

For the purpose of expanding the application scope of HEA coating manufactured on the surface modification of materials, in this work, the Al1.5CrFeNiTi0.5 and Al1.5CrFeNiTi0.5W0.5 HEA coatings were successfully manufactured using laser cladding method on SUS304. The microstructures and wear resistance of coatings are researched systematically. It is found that the W0 and W0.5 HEA coatings all exhibit the dendritic structure, which are constituted by BCC phases and Laves phases. With W element addition, the phase structures of W0.5 coating remain unchanged. W is dissolved in both two phases, but the solid solubility in Laves phase is higher compared to that in BCC phase. W0.5 coating with the highest microhardness of 848.34 HV, and the W0 coating with the microhardness of 811.45 HV, both of whose microhardness are four times more than that of SUS304 substrate. Among all samples, the W0.5 coating shows the optimal wear performance because of its larger content of hard second phase ( Laves phase).

scholarly journals Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

2020 ◽  
Author(s):  
Bharat Gwalani ◽  
Tianhao Wang ◽  
Abhinav Jagetia ◽  
Sindhura Gangireddy ◽  
Saideep Muskeri ◽  
...  
Keyword(s):  
Shear Deformation ◽  
High Strength ◽  
Shear Loading ◽  
Adiabatic Shear ◽  
Dynamic Strain ◽  
High Entropy Alloy ◽  
Dynamic Shear ◽  
High Entropy ◽  
Structural Applications ◽  
Static Conditions

Lamellar eutectic structure of Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc+B2 microstructure with high flow stresses >1500 MPa under quasi-static conditions. The response to shear loading was not investigated so far. This is the first report on the shear deformation of an eutectic structured HEA and effect of precipitation on shear deformation. The dynamic shear response (DSR) of the eutectic HEA was examined in two microstructural conditions, with and without the presence of L12 precipitates. A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local DSR of the alloy. The adiabatic shear bands (ASBs) in two different microstructural conditions were characterized after deformation at dynamic strain rates. The adiabatic shear localization occurs at low strains for the high strength material, and the eutectic microstructure does not delay cracking. The width of ASBs and the extent of plastic deformation around them has been correlated with the rate of straining. Dynamic recrystallization within ASBs and profuse twinning around it was observed. Local mechanical response of individual lamellae before and after shear deformation was examined using nano-indentation.

Fabrication of in-situ TiN ceramic particle reinforced high entropy alloy composite coatings by laser cladding processing

2021 ◽  
pp. 1-22
Author(s):  
Xinhong Wang ◽  
S. S. Liu ◽  
G. L. Zhao ◽  
M. Zhang
Keyword(s):  
Laser Cladding ◽  
Phase Structure ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Ceramic Particle ◽  
304 Stainless Steel ◽  
High Entropy Alloy ◽  
Laves Phases ◽  
High Entropy

Abstract In-situ TiN ceramic particle reinforced FeCoNiCrMnTi high entropy alloy coating was fabricated by laser cladding processing at high purity nitrogen gas atmosphere on the AISI 304 stainless steel substrate. The effect of Ti addition on the microstructure, phase structure and wear properties of the coatings were investigated. The results showed that phase structure of the coatings were mainly FCC-type γ phase. A few of cubic or flower-like TiN ceramic were formed after adding titanium into the FeCoNiCrMn powder. When atomic ratio of Ti exceeds 0.5, Laves phases appeared in the coatings. With increasing of Ti, the micro-hardness and wear resistance of the coatings increased, but friction coefficient and crack resistance of the coatings reduced. Suitable Ti content in the FeCoNiCrMnTix, laser composite coating had higher resistance to adhesive wear, oxidation wear and cracking resistance.

scholarly journals Gas tungsten arc welding of as-rolled CrMnFeCoNi high entropy alloy

2020 ◽  
Vol 189 ◽  
pp. 108505 ◽  
Author(s):  
J.P. Oliveira ◽  
T.M. Curado ◽  
Z. Zeng ◽  
J.G. Lopes ◽  
Emma Rossinyol ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Post-weld Heat Treatment and Groove Angles Affect the Mechanical Properties of T92/Super 304H Dissimilar Steel Weld Joints

2018 ◽  
Vol 37 (7) ◽  
pp. 649-654 ◽  
Author(s):  
Wang Shuo ◽  
Wei Limin ◽  
Cheng Yi ◽  
Tan Shuping
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Weld Metal ◽  
Arc Welding ◽  
Post Weld Heat Treatment ◽  
Steel Weld ◽  
Dissimilar Weld ◽  
Weld Joints ◽  
Gas Tungsten Arc ◽  
Weld Heat

AbstractThe microstructures and mechanical properties of dissimilar weld joints between T92 and Super 304H steels were investigated. Dissimilar weld joints with four groove angles were constructed using gas tungsten arc welding. The results showed that post-weld heat treatment improved the mechanical properties of the dissimilar weld joints. The optimal groove angle for T92/Super 304H dissimilar weld joints was found to be 20°, considering mechanical properties. Furthermore, the transformation from equiaxed dendrites to columnar dendrites was observed in the weld metal. Epitaxial growth and delta ferrites were found around the fusion line between the Super 304H and the weld metal.

Laser dissimilar welding of CoCrFeMnNi-high entropy alloy and duplex stainless steel

2021 ◽  
Vol 85 ◽  
pp. 95-105
Author(s):  
Nana Kwabena Adomako ◽  
Giseung Shin ◽  
Nokeun Park ◽  
Kyoungtae Park ◽  
Jeoung Han Kim
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Dissimilar Welding ◽  
High Entropy Alloy ◽  
High Entropy

Residual Stress Distribution in a Dissimilar Weld Joint by Experimental and Simulation Study

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Wenchun Jiang ◽  
Yun Luo ◽  
J. H. Li ◽  
Wanchuck Woo
Keyword(s):  
Residual Stress ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Weld Metal ◽  
Weld Joint ◽  
Heat Input ◽  
Dissimilar Welding ◽  
Asymmetric Distribution ◽  
Dissimilar Weld ◽  
Weld Root

Dissimilar welding between carbon steel and stainless steel is widely used in power plant. A lot of stress corrosion cracking (SCC) have occurred in the weld joint, which are affected greatly by residual stresses. This paper presents a study of residual stress in a dissimilar weld between 0Cr18Ni9 steel and 20 low carbon steel with Inconel 182 weld metal, by using neutron diffraction, X-ray diffraction measurement and finite-element method (FEM). The residual stresses show asymmetric distribution due to the dissimilar materials. The maximum longitudinal (1.92ReL304) and transverse stresses (1.07ReL304) are presented in the weld metal and heat effected zone of 20 carbon steel, respectively. Through the thickness of weld metal, the average longitudinal stress is around 370 MPa. The weld root has a stress concentration, and the stresses near the weld root in the 20 steel are larger than those in 0Cr18Ni9 steel, making the weld root become the most risk zone for SCC. With the increase of heat input, the residual stress and plastic deformation around the weld root increase. Hence, low heat input is recommended for the welding between 0Cr18Ni9 steel and 20 carbon steel.

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