小角中子散射揭示Mo对Ti-Mo微合金钢相间纳米析出的影响

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

摘要

含钛微合金钢常与钼(Mo)合金化以减少纳米析出的粗化,但其机制仍有争议。用小角中子散射法对钛合金和钛钼合金钢的析出相组成和粗化过程进行了表征。结果表明~25 at。(Ti, Mo)C析出相中%的Ti被Mo取代,增加了析出相的体积百分比和平均尺寸。Mo合金化没有延缓析出物粗化,但改善了析出物与基体之间的晶格失配,提高了ti -Mo合金钢的耐时效性能。这种新的认识为设计具有低合金元素的耐老化微合金钢提供了机会。
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Small-Angle Neutron Scattering Reveals the Effect of Mo on Interphase Nano-Precipitation in Ti-Mo Micro-Alloyed Steels
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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