Microstructure and Mechanical Properties of Combined GTAW and SMAW Dissimilar Welded Joints between Inconel 718 and 304L Austenitic Stainless Steel

Sachin Sirohi; Shailesh M. Pandey; Aleksandra Świerczyńska; Grzegorz Rogalski; Naveen Kumar; Michał Landowski; Dariusz Fydrych; Chandan Pandey

doi:10.3390/met13010014

Metals (Dec 2022)

Microstructure and Mechanical Properties of Combined GTAW and SMAW Dissimilar Welded Joints between Inconel 718 and 304L Austenitic Stainless Steel

Sachin Sirohi,
Shailesh M. Pandey,
Aleksandra Świerczyńska,
Grzegorz Rogalski,
Naveen Kumar,
Michał Landowski,
Dariusz Fydrych,
Chandan Pandey

Affiliations

Sachin Sirohi: Department of Mechanical Engineering, SRM Institute of Science and Technology, Delhi NCR Campus, Modinagar 201204, India
Shailesh M. Pandey: Department of Mechanical Engineering, National Institute of Technology, Patna 800005, India
Aleksandra Świerczyńska: Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, Gabriela Narutowicza Street 11/12, 80-233 Gdańsk, Poland
Grzegorz Rogalski: Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, Gabriela Narutowicza Street 11/12, 80-233 Gdańsk, Poland
Naveen Kumar: Department of Mechanical Engineering, Indian Institute of Technology Delhi, Delhi 110016, India
Michał Landowski: Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, Gabriela Narutowicza Street 11/12, 80-233 Gdańsk, Poland
Dariusz Fydrych: Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, Gabriela Narutowicza Street 11/12, 80-233 Gdańsk, Poland
Chandan Pandey: Department of Mechanical Engineering, Indian Institute of Technology, Jodhpur N.H. 62, Nagaur Road, Karwar, Jodhpur 342037, India

DOI: https://doi.org/10.3390/met13010014
Journal volume & issue: Vol. 13, no. 1
p. 14

Abstract

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A dissimilar welded joint of Inconel 718 and 304L austenitic stainless steel was prepared using a combined procedure with the gas tungsten arc welding and shielded metal arc welding processes by employing the Ni-based fillers: ERNiCr-3 and ENiCrFe-3. The welded joints were investigated for metallographic testing and mechanical properties, and a relationship was established between the microstructure and the resultant mechanical properties. Microstructural observation revealed the formation of the unmixed zone on the 304L SS side. The weld metal showed that the fully austenitic microstructure consisted of the Nb- and Ti-rich carbide phases along the inter-dendritic spaces. The tensile test results at room temperature showed the failure from the weld metal which might be due to alloying element segregation along the inter-dendritic spaces. However, a tensile test at 600 °C showed the failure from the 304L SS base metal with a tensile strength and % elongation value of 377 MPa and 24%, respectively. The hardness plot showed the average hardness value of the weld metal of 236 ± 5 HV, which was higher than the 304L SS BM (204 ± 4 HV) but lower than the IN718 BM (243 ± 5 HV). The impact toughness of the weld metal was 109 J, which was significantly lower than the base metals. The poor impact strength of the weld metal might be due to the evolution of the NbC phase along inter-dendritic spaces.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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