|About this Abstract
||Materials Science & Technology 2020
||Environmentally Assisted Cracking: Theory and Practice
||Assessing the Influence of Hydrogen on The Deformation Behavior of a Precipitation-hardened Nickel-based Alloy
||Zachary D. Harris, Jishnu Bhattacharyya, Joseph Ronevich, Sean Agnew, James Burns
|On-Site Speaker (Planned)
||Zachary D. Harris
This study examines the effect of hydrogen (H) on the deformation behavior of Monel K-500 in various isothermal heat treatment conditions via uniaxial mechanical testing and transmission electron microscopy (TEM). In particular, H was found to modify work hardening metrics related to the dislocation storage and recovery rates. Specifically, the H-charged peak-aged specimen exhibited a significant increase in initial hardening (dislocation storage) rate relative to the H-charged under-aged specimen. Moreover, H was found to tangibly increase dislocation recovery rates for all heat treatment conditions, with the exception of the over-aged alloy. TEM of the non-charged and H-charged peak-aged specimens revealed the onset of widespread dislocation looping in the H-charged sample, while only planar slip bands were observed in the non-charged condition. Possible mechanisms to explain the observed effects of H are proposed and the applicability of these mechanistic insights to single-phase model alloys are then discussed.