| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Effect of Lamellarizing Heat Treatments on Low Temperature Impact Toughness in 9% Ni Steel Alloy |
| Author(s) |
Younghoon Kim, Eunji Song, So-Hyeon Lee, Minho Park, Hyunbo Shim, Ju-Young Kim |
| On-Site Speaker (Planned) |
Younghoon Kim |
| Abstract Scope |
Since liquified natural gas (LNG) has an extremely low temperature of -165 °C, LNG storage tanks face cryogenic environment. However, material become brittle at low temperatures, so, it is crucial to consider impact toughness at low temperatures. 9% nickel steel is widely used for LNG storage tanks due to excellent impact toughness at low temperatures. However, since nickel is expensive, research is being conducted to increase impact toughness while reducing nickel through heat treatment. In addition to the conventional heat treatment for manufacturing 9% nickel steel, lamellarizing heat treatment has been investigated. In this study, the impact toughness of lamellarized 9% Ni steel was measured using Charpy V-notch tests at -196°C and we achieved more than twice the impact toughness compared to conventional 9% Ni steel. Microstructure analysis and hardness measurements were conducted using SEM, EBSD, and nanoindentation to evaluate the factors influencing the impact toughness after lamellarizing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Iron and Steel, |