Effect of thermal aging on metallurgical, tensile and impact toughness performance of electron beam welded AISI 316 SS joints

Kumar, Arun; Singh, Bharat Raj; Sandhu, Sandeep Singh

doi:10.1016/j.fusengdes.2020.111949

Cited by 17 publications

(5 citation statements)

References 34 publications

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“…Typical weld morphology (associated with keyhole EB welds) with a wider upper and relatively narrower lower region was observed. [ 25 ] The width of the FZ was observed to be larger at the top and gradually decreased towards the root region of the joint. This was due to the shape of the concentrated beam of electrons operating in keyhole mode, wherein the volume of the molten metal gradually decreases towards the root region of the weld joint.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

Singh

Shahi

2021

Materials & Corrosion

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Different electrochemical techniques were used to study the corrosion behavior of UNS S32205 duplex stainless steel (DSS) welded autogenously using a single‐pass by electron beam welding process, supplemented by microstructural characterization. Furthermore, a comparative study was also performed between multipass gas tungsten arc (GTA)‐welded and EB‐welded DSS for their microstructure and corrosion behavior. The differences in weld thermal cycle and chemical composition influenced the fusion zone microstructure of both the welds and eventually their corrosion properties. The general corrosion resistance of the EB weld was lower than the base metal and higher than the GTA weld despite its weld zone being characterized by a relatively unbalanced phase ratio (α/γ) in comparison to the GTA weld. However, the EB weld showed relatively higher susceptibility to pitting corrosion than the base metal and GTA weld due to its poor repassivation characteristics and poor resistance to pit growth.

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Section: Resultsmentioning

confidence: 99%

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

Singh

Shahi

2021

Materials & Corrosion

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“…This may be due to higher holding time which led to the involvement of carbides. 45 Microhardness results along with the weld bead. Figure 7 shows the microhardness measurements along with the weld bead.…”

Section: Metallurgical Characterization Of Dissimilar Weld Of Ss 316l...mentioning

confidence: 99%

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Singh

Goyal

Rana

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work discusses the macrostructure, microstructure, and microhardness of dissimilar metal weld joints between AISI 316L SS-DSS 2205 developed by gas tungsten arc welding (GTAW) welding. Post-weld heat treatments (PWHT) were carried out at temperatures of 750°C for 24 h and 850°C for 0.5 h. The macrostructure and microstructure of the welding joints at different welding conditions were observed by scanning electron microscope. The macrostructure study results indicated that all the welded joints were fully penetrated and free from defects. However, the microstructure investigation revealed a solid-state transformation of ferrite into grain boundary austenite, widmanstatten austenite, intergranular austenite, and partially transformed austenite. The post-weld heat treatment processes enhanced the precipitation of the sigma phase in the ferrite matrix. Secondly, the microhardness across and along the weld bead has been evaluated, and the results are compared. It was observed that the microhardness of the heat-affected zone of DSS 2205 is found to be higher as compared to a heat-affected zone of AISI 316L, the weld metal zone, and base metals at all welding currents (i.e. 90 A, 109 A, and 132 A). The microhardness values decrease when transverse from the face of the weld toward the root pass. Microhardness values at the fill (top) pass of the weld zone at 90 A, 109 A, and 132 A were 268.3 HV, 257 HV, and 255 HV respectively. It was found that the microhardness has improved significantly after post-weld heat treatments and was highest for 750°C/24 h. It may be due to higher holding time which led to the involvement of carbides.

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“…All samples failed from the weld metal, which shows that weld metal was weaker than the base metal. This may have accredited because the parting line formed in the EBW is the weakest part of the weld [34,41].…”

Section: Tensile Studiesmentioning

confidence: 99%

Microstructural characterization and mechanical performance along the thickness of electron beam welded stabilized AISI 321 stainless steel

2021

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The Electron Beam welding (EBW) process was employed to fabricate 18 mm thick fully penetrated butt welds of AISI 321 stainless steel. Nail shaped weld wide at the top and narrow at the bottom was obtained. Characterization of the weld joint was carried out using optical microscopy, scan electron microscopy, X-ray diffraction, microhardness, impact toughness test and tensile strength test. The microstructure of the weld metal was found to be free from defects like cracks porosity etc. The weld metal consisted of the primarily austenitic matrix with skeletal and vermicular morphology of δ-ferrite by the side of the grain boundaries. Carbides of Cr and Ti were found in the weld metal after the thermal aging treatment of 750°C for 24 hours as reveled by the XRD analysis. The tensile strength study revealed a maximum strength of 575 MPa at the root of the weld joint in the as-welded state. The maximum impact toughness of 129.3 J was obtained in the top section of the weld in the as-welded condition. The results in terms of structure-property correlaterelationship. This study recommends the effectiveness of EBW for joining 18 mm thick AISI 321.

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Effect of thermal aging on metallurgical, tensile and impact toughness performance of electron beam welded AISI 316 SS joints

Cited by 17 publications

References 34 publications

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

Effect of post-weld heat treatment on the metallurgical studies of dissimilar weldments of SS 316L welded with DSS 2205

Microstructural characterization and mechanical performance along the thickness of electron beam welded stabilized AISI 321 stainless steel

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