The research about effects of Nb on martensite size and mechanics in B-bearing steel was completed. The results show that both steels have similar martensite due to high hardenability of B element which is responsible for high mechanical properties. However, there are differences in the microstructures between A steel (Nb-containing steel) and the B steel (Ti-containing steel). Microstructural observation of the quenched specimen shows that the formation of fine martensite is dominant in the A Steel than B steel due to Nb element. Martensite size in B-bearing steel was refined by Nb element for high fatigue property and toughness.
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