Development of Life Prediction Models for High Strength Steel in a Hydrogen Emitting Environment

Report No. ARL-TR-6006
Authors: Scott M. Grendahl, Franklyn Kellogg, Hoang Nguyen, and Matthew Motyka
Date/Pages: May 2012; 48 pages
Abstract: Solvent substitution for maintenance and overhaul operations of military systems has been a primary environmental concern for many years. Cadmium replacement in these systems has been targeted for decades. Both of these areas have a common obstacle for implementation of any potential alternative. Hydrogen embrittlement of high strength steel is the most predominant unforeseen hurdle since high strength materials show sensitivity to the phenomena and the source of the hydrogen can be anything within the fabrication process, maintenance practice, or the natural corrosion cycle. Standardized testing on this issue has traditionally stemmed from the aerospace industry where it is a principal focus. Historically, the various aerospace defense contractors have each tested in their own manner, which has led to the national standard incorporating many approved test geometries and "grey"procedures. This work evaluated hydrogen susceptibility over a range of material strength, load level, and hydrogen emitting environment (weight-percent sodium chloride [NaCl]) which demonstrated performance with parameter ranges, not as "pass/fail"results, while developing life predictive models for each geometry.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2012