About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
New Frontiers in Physical Metallurgy of Steels
|
| Presentation Title |
Influence of Isothermal Hold Times on the Microstructure and Mechanical Properties During the Quenched and Partitioning Process for Medium Carbon Steel |
| Author(s) |
Miranda Bell, Adira Balzac, Kip Findley, John G Speer |
| On-Site Speaker (Planned) |
Adira Balzac |
| Abstract Scope |
The quenching and partitioning method for processing plate steels allows for enhanced combinations of strength and ductility. However, comprehensive knowledge regarding the effects of a hold during the quench stage is lacking, particularly with regards to austenite stability as a function of time. The microstructure and mechanical properties of a 0.29C-1.52Si-1.51Mn-0.30Cr steel following isothermal treatments held from 10 s - 3 h at 280 °C were investigated. The results show that a 10 s isothermal hold led to incomplete carbon partitioning, while complete partitioning was observed when held for 100 s. Further holding to 3 h exhibited overpartitioning and decomposition of retained austenite. All isothermal holds led to the presence of retained austenite. Hardness measurements indicated a constant hardness range between 10 - 100 s, while longer holds led to a decrease in hardness. This study suggests that increasing isothermal hold times are detrimental to hardness and retained austenite stability. |