Investigations on Dissimilar Weldments of Inconel 625 and AISI 304

Mithilesh, P.; Varun, D.; Reddy, Ajay Reddy Gopi; Ramkumar, K. Devendranath; Arivazhagan, N.; Narayanan, S.

doi:10.1016/j.proeng.2013.11.013

Cited by 47 publications

(18 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The bimetallic joints of Inconel 625 and austenitic stainless steel AISI 316 L are used in the chemical process at very high temperatures, especially the chromic acid calcining process, which contains a diluted acidic environment. Therefore, many researchers have studied it during last decade [7][8][9][10][11]. One of the main reasons is that it reduces cost of materials, and the other is that it improves design as a result of operating environment requirements [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Dökme

Külekçi

Eşme

2018

Metals

View full text Add to dashboard Cite

This study investigated the microstructure of the dissimilar metal welding of Inconel 625 and AISI 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) processes with ERNiCr-3, TIG 316L and twisted (ERNiCr-3 and TIG 316L) fillers. Microstructure examinations were carried out using an optical microscope and Scanning Electron Microscopy (SEM)/Energy Dispersive X-Ray (EDAX). The results of the study showed the existence of a partially melted zone (PMZ) on the AISI 316L side. Weld zone (WZ) analysis showed the existence of a multi-directional grain growth on the 316L side in all specimens, although less growth was found on the Inconel 625 side. Grain growth almost disappeared using PCGTAW with twisted fillers. SEM/EDAX investigations indicated that secondary deleterious secondary phases were tiny and white in five experiments. However, a meager amount of precipitates occurred in PCGTA welding with twisted fillers. Moreover, these were particularly innocent precipitates, represented by black dots in images, whereas other tiny white secondary phases are known to be brittle. As a result, PCGTA welding with twisted fillers exhibited the best metallurgical properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Dökme

Külekçi

Eşme

2018

Metals

View full text Add to dashboard Cite

show abstract

“…Inconel 718 base metal is a solution strengthened Ni-based superalloy with a higher microhardness (201-214 HV) than that of SUS 316 base metal (152-171 HV); the microhardness measured in the weld metal region (192-218 HV) is approximately the same as that of Inconel 718 base metal and is higher than that of SUS 316 base metal. However, the hardness values of the weld metal vary, which may be attributed to the variation in the supersaturation of Nb and Mo strengthening elements in the γ-matrix [14]. The length of the weld metal is found to be approximately 2 mm.…”

Section: Microstructuresmentioning

confidence: 96%

“…Patterson et al joined alloy 625 and 304L stainless steel using autogenous gas tungsten arc welding, and the welds produced employing this technology were prone to weld solidification cracking [13]. P. Mithilesh et al also studied gas tungsten arc joining of Inconel 625 to AISI 304 using a Mo-rich filler wire, and with a low heat input employed in the gas tungsten arc welding (GTAW), the hot cracking tendency was completely avoided [14]. Second, there are some differences between Inconel 718 and SUS 316 in terms of their physical properties, such as thermal conductivity, linear expansion coefficient, and melting point.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and mechanical properties of Ni/Fe dissimilar butt joint welded using the cold metal transfer

Tang

Ding

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

In this study, dissimilar butt joints were formed between as-rolled Inconel 718 and SUS 316 using cold metal transfer (CMT) with ERNiFeCr-2 filler metal at a welding speed of 5 mm s −1 and three different welding currents (130, 160 and 190 A). The morphology, microstructure, and mechanical properties of the joints and the mechanism by which the joint interface formed were studied. The results indicate that CMT welding parameters have an effect on the weld appearance and that the weld metal exhibits better wettability and spreadability at a welding current of 160 A. The interface between the weld metal and SUS 316 base metal was characterized by applying an optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometry (EDS). The results revealed that no obvious diffusion of Ni and Fe ions was identified across the joint interface. The fractures that initiated in the joints during the tension testing formed in the heat-affected zone (HAZ) of the SUS 316 base metal, and the high-temperature tensile strength of the joint was observed to be 424 MPa, which is approximately 87.06% of that of SUS 316 base metal (487 MPa) and 67.19% of that of Inconel 718 base metal (631 MPa). In terms of the elongation, the joint (21.9%), Inconel 718 base metal (21.2%) and SUS 316 base metal (22.3%) elongations were similar. For comparison, the joint also was tested at room temperature, resulting in a tensile strength and elongation of 511 MPa and 27.5%, respectively. A spherical elemental Ni segregation morphology was clearly observed at the high-temperature fracture. Hardness studies demonstrated that the weld metal hardness is higher than that of the SUS 316 base metal.

show abstract

“…In addition, the union of Inconel 625 to ASS is used in calcining process involving chromic acid which contains diluted acidic environment [35]. Another typical application of the bimetallic components is the sub-scale boiler employed for Advanced Stirling Conversion System project, where the sub scale boiler was built with AISI 316 for the condenser and Inconel 625 with 304L stainless steel wick for the boiler [36]. Cladding is another widely used application for the Ni-based alloy and stainless steels, e.g., hot section components in thermal power plant boilers, gas turbines and chemical industries are exposed to corrosive environments.…”

Section: Introductionmentioning

confidence: 99%

Functionally Graded SS 316L to Ni-Based Structures Produced by 3D Plasma Metal Deposition

Rodrı́guez

Hoefer

André

et al. 2019

Metals

View full text Add to dashboard Cite

In this investigation, the fabrication of functionally graded structures of SS316L to Ni-based alloys were studied, using the novel technique 3D plasma metal deposition. Two Ni-based alloys were used, a heat resistance alloy Ni80-20 and the solid-solution strengthened Ni625. Different configurations were analyzed, for the Ni80-20 a hard transition and a smooth transition with a region of 50% SS316L/50% Ni80-20. Regarding the structures with Ni625, a smooth transition configuration and variations in the heat input were applied. The effect of the process parameters on the geometry of the structures and the microstructures was studied. Microstructure examinations were carried out using optical and scanning electron microscopy. In addition, microhardness analysis were made on the interfaces. In general, the smooth transition of both systems showed a gradual change in the properties. The microstructural results for the SS316L (both systems) showed an austenite matrix with δ-phase. For the mixed zone and the Ni80-20 an austenite (γ) matrix with some M7C3 precipitates and laves phase were recognized. The as-built Ni625 microstructure was composed of an austenite (γ) matrix with secondary phases laves and δ-Ni3Nb, and precipitates M7C3. The mixed zone exhibited the same phases but with changes in the morphology.

show abstract

Investigations on Dissimilar Weldments of Inconel 625 and AISI 304

Cited by 47 publications

References 6 publications

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Microstructural and Mechanical Characterization of Dissimilar Metal Welding of Inconel 625 and AISI 316L

Microstructures and mechanical properties of Ni/Fe dissimilar butt joint welded using the cold metal transfer

Functionally Graded SS 316L to Ni-Based Structures Produced by 3D Plasma Metal Deposition

Contact Info

Product

Resources

About