|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|High Performance Steels
|Advancing AF96: Next Generation Strong/Tough Steels
|Michael Rupinen, Amy Clarke, John Speer
|On-Site Speaker (Planned)
AF9628 is a highly hardenable steel with a favorable balance of yield strength and impact toughness. While the high hardenability allows for use in large components, the effects of section size, alloying, and austenitization temperature on the microstructure and properties throughout a component are not fully characterized and understood. Large sections may experience significant differences in cooling rate during quenching leading to significant autotempering and autopartitioning in some regions. Understanding how to optimally process these steels is critical in continuing to develop strong/tough steels. Tensile and Charpy specimens were quenched in various media to simulate fast and slow cooling, representing the surface and center of large parts, for AF96 and a low Si AF96 variant. Additionally, two austenitization temperatures were studied to determine if a lower austenitization temperature might be feasible. Significant differences in the microstructural evolution and mechanical properties (especially Charpy impact energy) following quenching and tempering were observed.
|Iron and Steel, Mechanical Properties, Characterization