|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||The Effect of Microstructural Variation on Hydrogen Environment-Assisted Cracking Susceptibility of Monel K-500
||Zachary Harris, Brendy Rincon Troconis, John Scully, James Burns
|On-Site Speaker (Planned)
Monel K-500 is prone to hydrogen environment-assisted cracking (HEAC) when stressed in chloride-containing environments under applied potentials more negative than -800 mVSCE (vs. saturated calomel). Intermittent field failures of Monel K-500 components suggest this susceptibility is influenced by differences in environment, applied loading, and/or microstructure. Prior research has established the influence of the former two variables on HEAC, but the effect of lot-to-lot metallurgical variation on HEAC susceptibility is not understood. In this study, slow-rising stress intensity (K) testing and detailed microstructure and H-metal interaction characterization were coupled to establish the microstructural features that govern HEAC susceptibility in Monel K-500. Results suggest that yield strength, impurity segregation to grain boundaries, and hydrogen uptake are the dominant metallurgy-dependent features in determining HEAC susceptibility. Modifications to current micromechanical, decohesion-based models that incorporate the effect of impurity segregation to grain boundaries are proposed and additional experiments to validate such changes are discussed.
||Planned: Supplemental Proceedings volume