|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Improving hydrogen embrittlement resistance of martensitic stainless steels
||Michela Geri, Hyunseok Oh, Cemal Cem Tasan
|On-Site Speaker (Planned)
Hydrogen Embrittlement (HE) refers to the loss of ductility that metals and alloys undergo in the presence of hydrogen. The consequences for structural materials, and in particular for high strength steels, can be catastrophic even when hydrogen is present within the microstructure in small amounts (ppm). In this talk we will explore a new approach to improving HE resistance based on hydrogen dispersion, such that diffusible hydrogen is primarily located in a phase less prone to embrittlement. We will focus on a class of martensitic stainless steels recently developed in our lab, characterized by nanofilms of stable austenite domains. Combining testing across scales, from nanoindentation to bending and tensile tests, with damage analysis and hydrogen mapping, we will show how the nano-crystalline phases of stable austenite affect hydrogen diffusion and permeation through the bulk microstructure and hence the overall mechanical behavior.
||Iron and Steel, Mechanical Properties, Other