|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Reverted Austenite in Precipitation Hardened Stainless Steels: Design Considerations and Mechanical Effects
||Hyunseok Oh, Jiyun Kang, Menglei Jiang, Cemal Cem Tasan
|On-Site Speaker (Planned)
Engineering the reverted nanoscale austenite dispersed in a martensitic matrix has been known as a promising way to increase ductility and toughness without sacrificing strength in various advanced high strength steels (AHSS). The reverted austenite has also been introduced in precipitation-hardened martensitic stainless steels to increase the toughness. However, the precise role of reverted austenite on the mechanical properties of the stainless steels is not fully understood and requires a systematic investigation. Here, we study the mechanical effects of the reverted austenite with different stacking fault energies in a PH 17-4 stainless steel via integrated in-situ scanning electron microscope and in-situ synchrotron deformation experiments. In particular, we will discuss the effects of austenite on 1) strength and 2) strain localization with their fundamental mechanisms. This study will pave the way toward a well-targeted design of stainless steels for simultaneously increasing ductility and toughness without sacrificing strength.