Hot fissuring mitigation in arc welding of Nickelvac 23 superalloy

This research paper investigates the microstructure, microsegregation and mechanical behaviour of Ni-based superalloy 59 which is an important candidate in the pollution control application. The weld joints were produced with continuous current gas tungsten arc welding (CCGTAW) and pulsed current gas tungsten arc welding (PCGTAW) by applying both autogenous mode and filler wire ERNiCrMo-13. Weld flaws and weld aspect ratio of weld joints were identified using a macro analysis. An optical microscope (OM) and scanning electron microscope (SEM) were used to examine the microstructure of the welded joints. PCGTA weldments exposed refined grain structure, reduced heat-affected zone and narrow weld bead compared to CCGTAW. Microsegregation of the alloying elements at the weld center (WC) and weld interface (WI) was examined using Energy Dispersive X-ray spectroscopy (EDS). The findings of the metallurgical characterisation proved that the PCGTA weldments offer minimal microsegregation at the interdendritic region in comparison to CCGTA weldments. X-Ray Diffraction (XRD) examination reveals that there is a 16.7% enhancement in grain refinement in the autogenous mode and a 17.4% improvement in the filler wire ERNiCrMo-13 when switching from CCGTA to PCGTA welding. Tensile, Charpy impact and microhardness tests were used to assess the strength, toughness and hardness of the weld joints. Weld joints fabricated by PCGTAW offers higher tensile strength ( ̴ 1.4 to 1.6%), higher toughness ( ̴ 4.4 to 5.4%), and higher hardness ( ̴ 4.8 to 7.7%) than CCGTAW weld joints.

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“…This causes the refinement in the grain structure in PCGTAW. Many researchers have reported a similar type of observation [18,19,21].…”

Section: Microstructure Of Ccgtaw and Pcgtaw With Autogenousmentioning

confidence: 61%

“…The presence of a greater number of equiaxed fine grains is also the reason for the higher toughness of PCGTA weldments. It is relevant to note that many authors have reported the improvement of impact toughness of Ni-Cr-Mo alloys after switching from CCGTAW to PCGTAW [21][22][23].…”

Section: Impact Resultsmentioning

confidence: 99%