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Hot Corrosion Demeanour of Key-Hole Plasma Arc Welded Aerospace Grade Hastelloy X in Molten Salts Environment
- Mathiyazhagan Sathishkumar - Vellore Inst of Technology ,
- Pasupathi Subramani - Jain University ,
- Natarajan Arivazhagan - Vellore Inst of Technology ,
- Kesavan GokulKumar - Vellore Inst of Technology ,
- CD Naiju - Vellore Inst. of Technology ,
- Savarimuthu Jerome - National Institute of Technology Trichy ,
- Manoharan Manikandan - Vellore Inst of Technology
ISSN: 2641-9637, e-ISSN: 2641-9645
Published September 25, 2020 by SAE International in United States
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
Citation: Sathishkumar, M., Subramani, P., Arivazhagan, N., GokulKumar, K. et al., "Hot Corrosion Demeanour of Key-Hole Plasma Arc Welded Aerospace Grade Hastelloy X in Molten Salts Environment," SAE Int. J. Adv. & Curr. Prac. in Mobility 3(2):823-830, 2021, https://doi.org/10.4271/2020-28-0422.
The current work investigates the hot corrosion demeanour of Hastelloy X weldment produced with autogenous mode through key-hole plasma arc welding (K-PAW). The hot corrosion test has been performed for weldment in molten salt-1 (MS-1) (75 % Na2SO4 + 25 % V2O5) and molten salt-2 (MS-2) (75 % Na2SO4 + 20 % V2O5 + 5 % NaCl) circumstance for 25 hrs (25 cycles) at 900 °C. The MS-1 substrate of both base metal and weldment provided the lowest weight gain than the MS-2 substrate. The NaCl in the MS-2 causes severe hot corrosion on the substrate, whereas the absence of NaCl in MS-1 reduces the hot corrosion effects. The highest parabolic constant is observed for K-PAW weldment in MS-2 condition. The tendency of hot corrosion rate follows the order of, Base Metal MS-1 < K-PAW MS-1 < Base Metal MS-2 < K-PAW MS-2. The occurrence of protective phases like chromium oxides (Cr2O3), spinel oxides (NiCr2O4 and NiFe2O4) Nickel oxide (NiO) on the substrate resist the further oxidation. But, the development of MoO3 and Fe2O3 phases are increased the cracking as well as spallation rate which promotes severe corrosion of the substrates. The plasma arc welded substrate and base metal in MS-1 condition are giving better resistance than in MS-2 at 900 °C.