About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances and Challenges in Decarbonization of the Steel Industry
|
| Presentation Title |
Microstructure Evolution in Rapid Nitriding of SACM645 Using Induction Heating |
| Author(s) |
Kazuhiro Abe, Hisamitsu Hato, Takeshi Obana, Kazuya Shinagawa, Itaru Fujita |
| On-Site Speaker (Planned) |
Kazuhiro Abe |
| Abstract Scope |
Conventional surface heat treatment processes require high temperatures and long processing times, resulting in high energy consumption and substantial CO₂ emissions. High‑frequency induction heating enables rapid and localized heating and is therefore a promising approach for energy‑efficient surface modification. In this study, microstructural evolution during a rapid nitriding process combining induction heating with gas nitriting were investigated. Nitriding was conducted at 570 °C for periods ranging from several minutes to 180 min under an NH₃ atmosphere. Even for the shortest treatment time, a nitrogen compound layer was formed, providing surface hardness of approximately 1000 HV. Electron backscatter diffraction analysis revealed thatthe compound layer was primarily composed of ε‑Fe₂–₃N with a minor fraction of γ′‑Fe₄N. Nitrogen concentration profiles indicated rapid surface saturation, while extended processing primarily promoted compound layer growth and nitrogen diffusion into the substrate. These results demonstrate the feasibility of ultrafast, low‑energy nitriding enabled by induction heating. |