High-Temperature Tensile Behaviour of GTAW Joints of P92 Steel and Alloy 617 for Two Different Fillers

Amit Kumar; Sachin Sirohi; Shailesh Mani Pandey; Pradeep Kumar; Dariusz Fydrych; Chandan Pandey

doi:10.3390/ma16175880

High-Temperature Tensile Behaviour of GTAW Joints of P92 Steel and Alloy 617 for Two Different Fillers

Materials (Basel). 2023 Aug 28;16(17):5880. doi: 10.3390/ma16175880.

Authors

Amit Kumar¹, Sachin Sirohi², Shailesh Mani Pandey³, Pradeep Kumar⁴, Dariusz Fydrych⁵, Chandan Pandey¹

Affiliations

¹ Mechanical Department, Indian Institute of Technology Jodhpur, N.H. 62 Nagaur Road, Karwar 342037, India.
² Mechanical Department, SRM Institute of Science and Technology, Delhi NCR Campus, Modinagar 201204, India.
³ Department of Mechanical Engineering, National Institute of Technology, Patna 800005, India.
⁴ Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India.
⁵ 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.

Abstract

This study explores the high-temperature (HT) tensile rupture characteristics of a dissimilar gas-tungsten-arc-welded (GTAW) joint between P92 steel and Alloy 617, fabricated using ER62S-B9 and ERNiCrCoMo-1 fillers. The high-temperature tensile tests were performed at elevated temperatures of 550 °C and 650 °C. An optical microscope (OM) and a field emission scanning electron microscope (FESEM) were utilized to characterize the joint. The high-temperature test results indicated that the specimen failed at the P92 base metal/intercritical heat-affected zone (ICHAZ) rather than the weld metal for the ERNiCrCoMo-1(IN617) filler. This finding confirmed the suitability of the joint for use in the Indian advanced ultra-supercritical (A-USC) program. The fracture surface morphology and presence of precipitates were analysed using an SEM equipped with energy dispersive spectroscopy (EDS). The appearance of the dimples and voids confirmed that both welded fillers underwent ductile-dominant fracture. EDS analysis revealed the presence of Cr-rich M₂₃C₆ phases, which was confirmed on the fracture surface of the ER62S-B9 weld (P92-weld). The hardness plot was analysed both in the as-welded condition and after the fracture.

Keywords: ER62S-B9; ERNiCrCoMo-1; P92 steel; alloy 617; dissimilar weld; fracture surface; high-temperature.

Grants and funding

The authors would like to thank Indian Institute of Technology Jodhpur, India, for providing funding to the research project entitled “Study on weldability issues, diffusible hydrogen, and residual stresses in dissimilar welds joint of Ni-based super alloy (IN617) and ferritic/martensitic grade P92 steel” under the Grant No. SEED/CHP/20210130.