| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Microstructure and Hardness Evaluation of a Quenched and Partitioned Gray Cast Iron |
| Author(s) |
Edson Luiz Luiz da Da Silva Junior, Selauco Vurobi Junior, Fabio Edson Mariani, Kahl Dick Zilnyk, Antonio Ramirez |
| On-Site Speaker (Planned) |
Edson Luiz Luiz da Da Silva Junior |
| Abstract Scope |
Quenching and partitioning is a treatment extensively studied in dual-phase steels and nodular cast irons, but scarcely explored in grey cast irons. The treatment consists of 3 stages: austenitization, quenching, and partitioning. This study aims to identify the influence of different partitioning times on the material's hardness, the amount of retained austenite, and in comparison to different heat treatments, such as tempering, austempering, and regular quenching. The partitioning time ranged from 0 to 90 minutes, and the austenitizing temperature used was 900 °C for up to 2 hours. The microstructure up to 30 minutes is martensitic with retained austenite; after that, the microstructure becomes bainitic and ferritic. EBSD analyses indicate that for austempering and tempering with a partitioning time of 30 minutes, the amount of retained austenite is similar. Microhardness increases until 45 minutes, then decreases with the change in microstructure. Q&P is a promising heat treatment for GCI. |