About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing for Energy Industry
|
| Presentation Title |
A Study on High-Temperature Hardness, Wear, and Sulphuric-Acid Corrosion Characteristics of TiN Laser-Cladding and Nitriding Layers on Ti–Gr.12 Alloy for High-Pressure Acid-Leach Ball Valves |
| Author(s) |
Sang-Ha Park |
| On-Site Speaker (Planned) |
Sang-Ha Park |
| Abstract Scope |
In this work, the surface of Ti–Gr.12 alloy was hardened by gas nitriding and by laser cladding of a Ti+TiN composite layer, and the resulting microstructure, room- and high-temperature hardness, high-temperature sliding wear and sulphuric-acid corrosion behaviour were evaluated against Ti–Gr.2 and Ti–Gr.12 substrates. The nitrided/clad surface raised the room-temperature hardness to about 37 HRC, compared with about 17 HRC for Ti–Gr.12 and about 8 HRC for Ti–Gr.2. In static-autoclave immersion in 1 M H₂SO₂ at 200 °C/5 MPa, the Ti–Gr.12 substrate developed a dense passive film and showed the lowest corrosion rate, whereas the TiN-clad layer exhibited a higher corrosion rate associated with intergranular attack along cladding cracks. The results indicate that Ti–Gr.12 combines the best intrinsic corrosion resistance, while surface hardening must be engineered to suppress cladding cracks if the wear–corrosion balance required for HPAL ball-valve service is to be met. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Composites, Powder Materials |