Abstract
Earlier studies have shown that interlath austenite in martensitic steels can enhance hydrogen embrittlement (HE) resistance. However, the improvements were limited due to microcrack nucleation and growth. A novel microstructural design approach is investigated, based on enhancing austenite stability to reduce crack nucleation and growth. Our findings from mechanical tests, X-ray diffraction, and scanning electron microscopy reveal that this strategy is successful. However, the improvements are limited due to intrinsic microstructural heterogeneity effects.
Notes
Comparison is made using the mean of the three \( {\text{MA}}_{\text{H}} \) samples and the single \( {\text{MA}}_{\text{CR - H}} \) sample with an equivalent time between H charging and mechanical testing, although the other \( {\text{MA}}_{\text{CR - H}} \) samples had similar mechanical properties.
It was not possible to quantify this point due to inconsistencies of the voids introduced during different sample preparation. Nevertheless, there were no observations of the void clusters after observing several 20×20 m high resolution ECC images containing a large number of grains (on the order of ten thousand).
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The authors gratefully acknowledge the use of the shared experimental facilities supported in part by the MRSEC program of the National Science foundation under the award number DMR – 1419807.
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Cameron, B.C., Koyama, M. & Tasan, C.C. Phase Stability Effects on Hydrogen Embrittlement Resistance in Martensite–Reverted Austenite Steels. Metall Mater Trans A 50, 29–34 (2019). https://doi.org/10.1007/s11661-018-4948-x
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DOI: https://doi.org/10.1007/s11661-018-4948-x