Effect of grain orientation and interface coherency on the hydrogen trapping ability of TiC precipitates in a ferritic steel

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The way of capturing hydrogen has always been the focus of research in steels. Through the in-situ SKPFM study, a great Volta potential difference has been found between the TiC precipitates (∼0.82 μm) and the matrix after hydrogen charging, especially at the phase interface, which is demonstrated as an effective hydrogen trapping site. Moreover, the TiC carbides precipitated in the ferrite (111) plane show a higher average potential increase than that in the (110) plane. The difference of hydrogen trapping ability can be attributed to the deviation of Baker-Nutting orientation relationship of the precipitate/matrix interface, since the interface coherency on the (111) plane is destroyed more severely due to a lower Schmid factor of (111) orientation during the coiling process.