Abstract
In the present investigation, an attempt has been made to join Hastelloy C-276 nickel-based superalloy and AISI 321 austenitic stainless steel using ERNiCrMo-4 filler. The joints were fabricated by continuous and pulsed current gas tungsten arc welding processes. Experimental studies to ascertain the structure-property co-relationship with or without pulsed current mode were carried out using an optical microscope and scanning electron microscope. Further, the energy-dispersive spectroscope was used to evaluate the extent of microsegregation. The microstructure of fusion zone was obtained as finer cellular dendritic structure for pulsed current mode, whereas columnar structure was formed with small amount of cellular structure for continuous current mode. The scanning electron microscope examination witnessed the existence of migrated grain boundaries at the weld interfaces. Moreover, the presence of secondary phases such as P and μ was observed in continuous current weld joints, whereas they were absent in pulsed current weld joints, which needs to be further characterized. Moreover, pulsed current joints resulted in narrower weld bead, refined morphology, reduced elemental segregation and improved strength of the welded joints. The outcomes of the present investigation would help in obtaining good quality dissimilar joints for industrial applications and AISI 321 ASS being cheaper consequently led to cost-effective design also.
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Acknowledgments
The authors are thankful to the Director, Dr. N. S. Chaudhari, VNIT Nagpur for providing the essential facilities to carry out this investigation and for his continuous support to publish current work. The authors express their gratitude to Mr. G.K. Banerjee and Mr. P. Singha for the provision of the welding facilities. The authors are also thankful to Mr. Shreedhar Gadge and Mrs. Varsha Patankar to help in carrying solution annealing and mechanical testing. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Sharma, S., Taiwade, R.V. & Vashishtha, H. Effect of Continuous and Pulsed Current Gas Tungsten Arc Welding on Dissimilar Weldments Between Hastelloy C-276/AISI 321 Austenitic Stainless Steel. J. of Materi Eng and Perform 26, 1146–1157 (2017). https://doi.org/10.1007/s11665-017-2570-5
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DOI: https://doi.org/10.1007/s11665-017-2570-5