According to the test results, the microhardness showed a decreasing trend along the thickness direction (hydrogen diffusion direction) when the hydrogen charging time was only 6 h.
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Hydrogen Concentration Distribution in 2.25Cr-1Mo-0.25V Steel under the Electrochemical Hydrogen Charging and Its Influence on the Mechanical Properties.
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The sentences
In contrast to the hydrogen-free case, the microhardness of the samples after hydrogen charging presents an increasing trend, but the increased value was not uniform, which is related to the hydrogen concentration at different locations.