Possibility of block boundary design for further strengthening in martensitic steels

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<p>In ferritic steels, the grain boundary segregation of carbon at ferrite grain boundaries increases the Hall–Petch coefficient and enhances grain refinement strengthening. It is also possible to further enhance the grain refinement strengthening by promoting carbon segregation through low-temperature aging or other methods. On the other hand, carbon content has a significant effect on the contribution of grain refinement strengthening in martensitic steels. By considering martensitic steels in the same manner as ferritic steels, it was speculated that a "hard block boundary" could be designed if carbon could be used more effectively. In this report, we discuss the effect of carbon on grain refinement strengthening and its ability to control the mechanical properties of martensitic steels based on a review of previous studies and newly conducted experiments.</p>

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