Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels
Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels
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DOI：
10.1016/j.scriptamat.2019.08.016
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发表时间：
2020-01-01
影响因子：
6
通讯作者：
Lee, P. D.
中科院分区：
文献类型：
--
作者：
Wang, Y. Q.;Clark, S. J.;Lee, P. D.
含钛微合金钢通常与钼（Mo）合金化以减少纳米析出物粗化，尽管其机制仍有争议。利用小角中子散射，我们的特点是析出物的组成和粗化的钛合金和Ti-Mo合金钢。结果表明，与25 at.在（Ti，Mo）C沉淀物中，Ti被Mo取代，增加了沉淀物的体积百分比和平均尺寸。Mo合金化并不能阻止Ti-Mo合金钢中析出相的粗化，但能改善析出相与基体的晶格失配，提高Ti-Mo合金钢的抗时效性能。这种新的认识为设计具有贫合金元素的抗时效微合金钢提供了机会。(C)2019 Acta Materialia Inc由Elsevier Ltd.出版。保留所有权利。
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 similar to 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 ageing resistance of the Ti-Mo-alloyed steel. This new understanding opens opportunities for designing ageing-resistant micro-alloyed steels with lean alloying elements. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.