Assessing Heat-to-Heat Variations Affecting Mechanism Based Modeling of Hydrogen Environment Cracking (HEAC) in High Strength Alloys for Marine Applications: Monel K-500
Final rept. 15 Mar 2012-31 Dec 2015
VIRGINIA UNIV CHARLOTTESVILLE OFFICE OF SPONSORED PROGRAMS
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The objective of the proposed work was to inform, refine, and validate a recently developed mechanism based predictive model of Hydrogen Environment Cracking HEAC in high strength Alloys with a focus on Monel K-500. In this proposal, laboratory based material hydrogen environment assisted cracking HEAC data hydrogen interaction data will be developed based on testing of material obtained from field returned heats ofaged Monel K-500 bolts or studs documented to have HEAC issues compared to such data on unfailed or commercially procured material all satisfying the QQ-N-286 specification. This comparison will serve to determine whether a recently developed emerging predictive model of embrittlement for aged Monel K-500 fasteners subjected to cathodic polarization in marine environments must be modified to consider strong dependencies ofthe heat-to-heat or lot-to-iot variations in material when attempting to assess SCC lifetimes or whether the model is robust in this regard instead should focus on general material, environmental and geometric factors such as applied electrochemical potential, remote stress, geometry and surface roughness.
- Inorganic Chemistry
- Metallurgy and Metallography