Yiqiang Wang, S. Clark, B. Cai, D. Venero, Md. Mohidul Hasan, M. Gorley, E. Surrey, G. McCartney, S. Seetharaman, P. Lee
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引用次数: 11
Abstract
Ti-containing micro-alloyed steels are often alloyed with molybdenum (Mo) to reduce nano-precipitate coarsening, although the mechanism is still disputed. Using small angle neutron scattering we characterised the precipitate composition and coarsening of Ti-alloyed and Ti-Mo-alloyed steels. The results demonstrate ~25 at.% of Ti is substituted by Mo in the (Ti, Mo)C precipitates, increasing both the precipitate volume percent and average size. Mo alloying did not retard precipitation coarsening, but improved lattice misfit between precipitate and matrix, contributing to better aging resistance of the Ti-Mo-alloyed steel. This new understanding opens opportunities for designing aging-resistant micro-alloyed steels with lean alloying elements.
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