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This is a Experimental Study study.

October 10, 2025

A Study of High Temperature Hydrogen Attack in SA516 Grade 70 Carbon Steel and Weldment

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HTHA damages increase with higher temperatures, impacting carbon steel's mechanical properties and microstructure.
Creep tests reveal that weld metal exhibits minimal creep strength reduction under hydrogen exposure compared to base metal.
DIC measurements indicate localized creep deformation in different steel regions, affecting overall material performance.
Microstructural analysis shows progressive dissolution of cementite without significant void formation in low-pressure hydrogen.

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Experiments uncover high temperature hydrogen attack effects on carbon steel and weldments, indicating significant material degradation.

Wang et al. (2025) studied this question.

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