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Hot Corrosion Demeanour of Key-Hole Plasma Arc Welded Aerospace Grade Hastelloy X in Molten Salts Environment
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 25, 2020 by SAE International in United States
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
The current work investigates the hot corrosion demeanour of Hastelloy X weldment produced with autogenous mode through key-hole plasma arc welding. 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 the severe hot corrosion on the substrate whereas absence of NaCl in MS-1 reduces the hot corrosion effects. All the tested substrate follows the parabolic rate law and the highest parabolic constant is observed for plasma weldment in MS-2 condition. The tendency of hot corrosion resistance follows the order of, Base Metal <Plasma MS-1 <Base Metal MS-2 <Plasma 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 in MS-1 condition is giving the better resistance than MS-2 at 900 °C.
- 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