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A dissimilar welded joint of grade 92 steel and AISI 304L steel obtained using IN82 buttering and IN617 filler: relationship of microstructure and mechanical properties

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Abstract

Unfavourable operating conditions of equipment in the energy industry resulting from high-temperature loads determine the need to use special materials and technological solutions, including welding procedures. In this article, buttering using IN82 (ERNiCr-3) consumables was proposed as a method to improve the weldability of grade 92 steel joined by the gas tungsten arc welding (GTAW) process with AISI 304L (IN617 filler). The microstructural characterization of samples was carried out using an optical microscope, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy. The welded joint was further characterized by hardness, tensile (room temperature and at 620 °C temperature) and impact tests. Additionally, the fracture surfaces of tensile and impact tests were studied by SEM. Despite the confirmation of the diffusion of alloying elements and significant changes in their concentration, which indicates the formation of Ti and Nb-rich phases, no welding imperfections were detected and favourable joint structures and acceptable properties were obtained. In particular, this concerns the limitation of the formation of brittle structures and the elimination of the untempered martensitic layer. At the same time, there was a significant decrease in the maximum hardness of heat-affected zone (HAZ) on the grade 92 steel side to a relatively low value of 310 HV, and a minimum tensile strength criterion of 600 MPa was achieved with a simultaneous increase in ductility (35% elongation) of the joint. Comparatively, when compared to a non-buttered welded joint, the joint produced with a buttering layer exhibited an increase in the elongation and impact toughness of the welded joint without any compromise in ultimate tensile strength (Sut). The fracture surface of tensile and impact-tested specimens was also characterized using SEM/EDS. Summarizing all the results, it can be concluded that the proposed GTAW procedure of grade 92 and 304L steels can be used in extreme working conditions, in ultra-supercritical power units or the petrochemical and chemical industries.

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Authors and Affiliations

  1. Mechanical Engineering Department, Indian Institute of Technology Jodhpur, Karwar, Rajasthan, 342037, India

    Hardik Sanjay Surkar, Amit Kumar & Chandan Pandey

  2. Department of Mechanical Engineering, SRM Institute of Science and Technology, Delhi NCR Campus, Modinagar, Uttar Pradesh, 201204, India

    Sachin Sirohi

  3. Mechanical Engineering Department, National Institute of Technology Patna, Patna, 800005, Bihar, India

    Shailesh M. Pandey

  4. Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdańsk University of Technology, Gabriela Nar`Utowicza Street 11/12, 80-233, Gdańsk, Poland

    Aleksandra Świerczyńska & Dariusz Fydrych

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Contributions

Hardik Sanjay Surkar: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Roles/Writing -original draft; Writing—review & editing. Amit Kumar: Formal analysis; Investigation; Methodology; Roles/Writing -original draft; Writing—review & editing. Sachin Sirohi: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Roles/Writing -original draft; Writing—review & editing. Shailesh M Pandey: Conceptualization; Project administration; Resources; Software; Supervision; Validation; Visualisation; Funding acquisition; Investigation; Roles/Writing—original draft. Aleksandra Świerczyńska: Conceptualization; Data curation; Formal analysis; Investigation; Methodology; Roles/Writing -original draft; Writing—review & editing. Dariusz Fydrych: Conceptualization; Project administration; Resources; Software; Supervision; Validation; Visualisation; Funding acquisition; Investigation; Roles/Writing—original draft; Writing—review & editing. Chandan Pandey: Conceptualization; Project administration; Resources; Software; Supervision; Validation; Visualisation; Funding acquisition; Investigation; Roles/Writing—original draft; Writing—review & editing.

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Correspondence to Amit Kumar, Sachin Sirohi or Dariusz Fydrych.

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Surkar, H.S., Kumar, A., Sirohi, S. et al. A dissimilar welded joint of grade 92 steel and AISI 304L steel obtained using IN82 buttering and IN617 filler: relationship of microstructure and mechanical properties. Archiv.Civ.Mech.Eng 24, 109 (2024). https://doi.org/10.1007/s43452-024-00920-x

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