Influence of modes of metal transfer on grain structure and direction of grain growth in low nickel austenitic stainless steel weld metals

Mukherjee, Manidipto; Saha, Sandip; Pal, Tapan Kumar; Kanjilal, Prasanta

doi:10.1016/j.matchar.2015.02.006

Cited by 20 publications

(5 citation statements)

References 18 publications

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“…The amount of decrease in the crystalline grain size and development of γ prime precipitates in the PCGTAW weldment is believed to be the reason for the increase in the impact energy compared to GTAW and base metal. 25…”

Section: Resultsmentioning

confidence: 99%

“…The amount of decrease in the crystalline grain size and development of c prime precipitates in the PCGTAW weldment is believed to be the reason for the increase in the impact energy compared to GTAW and base metal. 25 Supplementary Figure S5(a) and (b) shows the SEM fractography photographs of fractured specimens. The impact ruptured samples are also revealed similar kinds of ductile tear ridges, ductile dimples, and cleavage facet over the ruptured surfaces of GTAW and PCGTAW, which observed in fractured tensile samples.…”

Section: Impact Testingmentioning

confidence: 99%

“…It clearly shows the fluid flow in molten pool is due to Lorenz force, Marangoni convection, buoyancy force, and shear stress produced by plasma jet acting on the weldment. 19,24,25 In GTAW, the temperature (H cs of 3.636 kJ/mm) at the weld centre is higher than the PCGTAW method (H cs of 3.113 kJ/mm) which reduced the Marangoni convection and shear stress due plasma jet effect in PCGTAW, minimizes the width of weld bead. 26 Hence, the surface tension, buoyancy, electromagnetism improved the weld pool circulation.…”

Section: Bead Profile Of Weldmentmentioning

confidence: 99%

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Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Munusamy

Manikandan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The conventional constant current arc welding of Hastelloy X (Ni-Cr-Fe-Mo) leads to the solidification and liquation cracks in the weldment. The higher heat supplied in constant current weldment develops the secondary carbide precipitates. It promotes the development of hot cracks in the weldment. In this study, joining of Hastelloy X plates was carried out by constant current gas tungsten arc welding (GTAW) and pulsed current gas tungsten arc welding (PCGTAW) with C263 filler wire. The result discovered that no hot cracks were formed in the weldment. In constant current mode, Cr-rich and Mo-rich Cr23C6 (M23C6), Fe2MoC, Fe3Mo3C (M6C), and Cr2Ti precipitates were observed. Whereas, in pulsed current mode, Ni3(Al, Ti), Ni3Ti, Co3Ti, Cr2Ti precipitates are found due to the segregation of Co, Al, and Ti. No Cr-rich and Mo-rich carbide phases identified in pulsed current weldment due to rapid cooling rate and higher thermal gradient observed during solidification. The tensile results revealed that 8.23% increase in the ultimate tensile strength and a 29.62% increase in elongation of pulsed current mode welding compared to constant current welding. Further, the microhardness and impact toughness of PCGTAW is 3.32% and 5.45% higher than GTAW, respectively. In pulsed current welding, better mechanical properties were identified compared to constant current welding. The nonappearance of Cr and Mo-rich phases and refined microstructure in the weldment are the main reason for better strength.

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Section: Resultsmentioning

confidence: 99%

Section: Impact Testingmentioning

confidence: 99%

Section: Bead Profile Of Weldmentmentioning

confidence: 99%

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Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Munusamy

Manikandan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…26 Due to lower outward shear stress developed by the arc plasma in the molten pool, the lesser outward flow of molten fluid towards the FB region is obtained, which reduces the weld bead width. 27 It is seen from the macro image of the PCGTA weldment, the width of the FZ is lesser, compared to the corresponding GTA welding technique. It is due to the lower heat supplied in the PCGTA welding comparing to GTA welding.…”

Section: Quality Of Weldmentsmentioning

confidence: 92%

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Munusamy

Manikandan

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

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“…In addition, there are works devoted to studies of the influence of pulsed energy and mechanical effects on the improvement of the mechanical characteristics of welded joints and deposited beads using wire and strip electrodes [7][8][9][10][11][12]. So, the study of the structure and microhardness of samples of welded joints of pipes showed a significant refinement of the structure of the weld metal and the heat-affected zone during welding in the pulsed mode [12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Heat-Affected Zone Properties During Cladding of Power Equipment with Austenitic Materials Using Control Mechanical Impacts on the Strip Electrode

Ivanov

Lavrova

Morgay

et al. 2021

MSF

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During cladding an austenitic layer on low-carbon and medium-alloyed steels, the properties of the heat-affected zone, along with the resistance of the surface layer to resist corrosion, largely determine the performance and durability of the surfaced product. The work is devoted to the study of the dependence of the properties of the heat-affected zone during cladding of power equipment with austenitic materials on the parameters of the control mechanical impacts on the strip electrode and determination of their optimal range, which ensures high values of the mechanical properties of the deposited layer.

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Influence of modes of metal transfer on grain structure and direction of grain growth in low nickel austenitic stainless steel weld metals

Cited by 20 publications

References 18 publications

Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

Investigation of the Heat-Affected Zone Properties During Cladding of Power Equipment with Austenitic Materials Using Control Mechanical Impacts on the Strip Electrode

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