|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Macro- and Micro-scale Study of Hydrogen Susceptibility of Advanced High Strength Sheet Steels
||Yiran Lu, Shrikant Bhat, Clyde Briant, Sharvan Kumar
|On-Site Speaker (Planned)
Hydrogen susceptibility of advanced high strength steels (AHSS) with tensile strengths greater than 1 GPa is a potential concern for automotive applications. Understanding the hydrogen susceptibility of constituent phases of AHSS can provide valuable insights into alloy design to mitigate the problem. Recent advances in microscale experimental techniques have made this multiscale approach possible. In this work, we performed tensile tests on M900, M1300, and M1700 martensitic sheet steels under different hydrogen charging conditions. M1700 with high hydrogen content showed a reduced total elongation of 1% compared to 7% without charging. M900 and M1300 showed less severe susceptibility. Quantitative fracture surface analysis revealed a 15% smaller dimple size in the hydrogen-charged conditions. Results from microfluid cell coupled with nanoindentation performed within grains isolated by EBSD, together with TEM provide insight into plastic deformation and possible cracking under the indent. These results will be presented and their implications discussed.
||Planned: Supplemental Proceedings volume