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Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels...

by Lizhen Tan, Jonathan D Poplawsky, Ying Yang
Publication Type
Journal
Journal Name
Materials Science and Engineering: A
Publication Date
Page Number
140900
Volume
807

Detailed investigations of two ferritic-martensitic steels, i.e., Nb- and Ta-steel, indicate that the higher Nb diffusivity and the lower nucleation driving force of Nb-carbide promote preferential nucleation of Nb-carbides at grain boundaries and thus a higher boundary occupancy than Ta-carbides, which favored greater creep resistance of Nb-steel than that of Ta-steel despite their similar yield strength.