Abstract
In the present study, the effect of the post weld heat treatment (PWHT) on mechanic and electrochemical behavior of weld overlay Inconel 182/AISI 4130 substrate using shielded metal arc welding (SMAW) process is investigated. The PWHT was carried out at 640°C for 3 hours under oxidant atmosphere. No apparent change was observed in the substrate microstructure after PWHT. Besides, the microstructure of the Inconel 182/AISI 4130 substrate interface was mainly composed of column Ni-γ grains that became coarser after PWHT. The energy dispersive X-ray (EDS) analysis showed that the diffusion gradient of Fe, Cr and Ni elements, from the melting limits toward the type II boundary near the interface, was more prominent after PWHT. Correspondingly, it was found that the adoption of PWHT was favorable to decrease the hardness mismatch between the Inconel 182 overlay and the AISI 4130 substrate. The effect of the PWHT on the tribological behavior of the Inconel 182 overlay was evaluated through a pin-on-disk test. The results showed an adhesive wear mechanism in both samples (as-welded and post-heat-treated) with severe plastic deformation, resulting in relatively higher volume loss in in both conditions. The electrochemical behavior of Inconel 182 overlay and the AISI 4130 substrate in H2SO4 solution revealed that the corrosion potential. (Ecorr), the current density (Icorr) and the corrosion rate were significantly enhanced after PWHT which considerably reduced the galvanic corrosion.
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The authors gratefully acknowledge the Research Center in Industrial Technologies (CRTI) for its financial support.
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Allou, D., Ould Brahim, I., Cheniti, B. et al. Effect of Post Weld Heat Treatment on Microstructure and Mechanical Behaviors of Weld Overlay Inconel 182 on 4130 Steel Substrate Using SMAW Process. Metallogr. Microstruct. Anal. 10, 567–578 (2021). https://doi.org/10.1007/s13632-021-00773-3
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DOI: https://doi.org/10.1007/s13632-021-00773-3