|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Multiscale Approaches to Hydrogen-assisted Degradation of Metals
||Hydrogen Embrittlement of High Strength Advanced Oilfield Alloys
||Indranil Roy, Manuel Marya, Xinghang Zhang
|On-Site Speaker (Planned)
Recently our industry has been affected by hydrogen embrittlement (H2E) of high strength corrosion resistant alloys resulting in cracking and failure of critical components in service. H2E susceptibility can be adversely affected by alloying (composition), stacking fault energy, strength / hardness, trapping characteristics, precipitate hardening, segregation at grain boundaries, cold working, etc. Grain refinement to process high-strength nanocrystalline materials can be favorable in reducing susceptibility to H2E due to higher volume fraction of low sigma coincident site lattice boundaries (low ∑CSLs’), depending on the processing route. Here we present, the beneficial effects of special low energy coherent grain boundaries in reducing susceptibility to H2E of a thermo-mechanically processed ultra-fine grained nickel alloy (devoid of precipitates) in contrast to its lower strength precipitate hardened commercial counterpart. In our talk, results from slow strain rate tests in H2S-brine with cathodic polarization (1100mV below OCP) complimented by advance analytical techniques will be presented.
||Planned: Paper Selections