Microstructure and mechanical properties of A-TIG welded AISI 316L SS-Alloy 800 dissimilar metal joint

In the present work, Inconel 625 and Incoloy 800 thin sheets were TIG-welded without using fillers and at three different welding currents (40 A, 50 A, and 60 A). The influence of variation in welding currents on various characteristics of the weldments was investigated using various characterization techniques. Weldments obtained at 60 A showed the highest tensile strength and plastic deformation due to the formation of cellular dendritic microstructure in the fusion zone. Observation of the fractured surfaces revealed ductile nature for all the weldments. In addition, impact tests were performed at 25°C, 150°C, and 250°C, and the results indicated that with the rise in temperature, impact toughness decreased due to coarsening of carbides at grain boundaries in all the weldments. Furthermore, impact properties and hardness of weldments were also affected owing to the differences in interdendritic spacing and grain size. Weldments obtained at 40 A depicted higher nanohardness, whereas 50 A weldment showed relatively greater pileup height as compared to other weldments. Moreover, 60 A weldments showed highest longitudinal and transverse residual stresses due to relatively higher volumetric changes.

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“…This grain coarsening can be attributed to the dissolution of precipitates in the matrix during heating and cooling of weldment. 23…”

Section: Microstructural Analysismentioning

confidence: 99%

Influence of welding current on the microstructure, mechanical properties, residual stresses, and nano-mechanical behavior of tungsten inert gas-welded dissimilar joints of Inconel 625 and Incoloy 800

Ramay

Shehbaz

Khan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In DIC, the location of dissimilar weld was divided into 5 different zones Monel 400 base, Monel 400 HAZ, Weld metal, SS 316L HAZ, SS 316L base for HT, CT, and UT specimens. The true stress-strain relationship [ 20 ] is given by using Equation (1).

…”

Section: Tensile Test Digital Image Correlation Fractography Anmentioning

confidence: 99%

“…In Equation (2), A 0 is the initial cross-sectional area and ε is the major strain in a local zone estimated by DIC analysis [ 20 ]. At each stage of CT specimen, local strain distribution was predicted from DIC and shown in Figure 9 .…”

Section: Tensile Test Digital Image Correlation Fractography Anmentioning

confidence: 99%

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Digital Image Correlation of Tensile Properties for Monel 400/SS 316L Dissimilar Metal Welding Joints

et al. 2021

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Dissimilar metal weld joints of Monel 400 and Stainless Steel 316L stainless steel were carried out using Gas Tungsten Arc Welding (GTAW). Conventional annealing and cryogenic treatment were performed on the welded joints. Weld joints of this combination of materials have enormous potential applications in power industry and the available related literature is limited. In the present study, the tensile properties of heat treated (HT), cryotreated (CT), and untreated (UT) specimens were studied. The engineering stress and strain were determined experimentally as per Standard Test Methods for Tension Testing of Metallic Materials (ASTM E8). The strain distribution was evaluated at different zones of weld joint was evaluated using Digital Image Correlation (DIC). Significant difference was noticed between the zones. Weld zone of all samples had less local stress and strain and SS 316L heat affected zone (HAZ) zone had more local stress and strain when compared to other zones. The local strain distribution along distance from weld center line and local stress-strain curves of different zones are also predicted. Scanning Electron Microscopy was used to analyze the fracture behavior of welded samples for HT, CT, and UT specimens.

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“…The macroscopic mechanical properties of materials have traditionally and generally been determined by uniaxial tensile/ compression and multiaxial tests, such as metals, concrete and polymer materials [1][2][3][4]. However, these methods requires the samples with specific geometries which may not be always feasible [5].…”

Section: Introductionmentioning

confidence: 99%

A modified Sneddon model for the contact between conical indenters and spherical samples

Han

Chen

2021

Journal of Materials Research

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Indentation techniques have proven to be effective to characterize the mechanical properties of materials. For the elastic deformation, the commonly used models are Hertz model and Sneddon model. However, neither of them works for indenting the spherical samples using the pyramid or conical indenter. Therefore, one modified Sneddon model has been developed to determine the Young’s modulus of spherical samples from indentation results. In this study, the effects of sample diameter and indenter angles on indentation tests were investigated by finite element method (FEM). The empirical correction parameters in the new mathematical model were introduced based on dimensional analysis and determined by the numerical fitting to FEM results. Experimental tests with different conical indenters have demonstrated that the new model is capable to reliably determine the Young’s modulus of the spherical samples. The new model can fill the gap of the contact mechanics and enrich the experimental solid mechanics for the interpretation of indentation results. Graphic abstract

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Microstructure and mechanical properties of A-TIG welded AISI 316L SS-Alloy 800 dissimilar metal joint

Cited by 58 publications

References 33 publications

Influence of welding current on the microstructure, mechanical properties, residual stresses, and nano-mechanical behavior of tungsten inert gas-welded dissimilar joints of Inconel 625 and Incoloy 800

Influence of welding current on the microstructure, mechanical properties, residual stresses, and nano-mechanical behavior of tungsten inert gas-welded dissimilar joints of Inconel 625 and Incoloy 800

Digital Image Correlation of Tensile Properties for Monel 400/SS 316L Dissimilar Metal Welding Joints

A modified Sneddon model for the contact between conical indenters and spherical samples

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