Precipitation sequence in niobium-alloyed ferritic stainless steel

Precipitation sequence in niobium-alloyed ferritic stainless steel
复制标题

铌合金铁素体不锈钢中的沉淀顺序

DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Kikuchi
M. Kikuchi
中科院分区：
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文献类型：
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作者：
N. Fujita;H. Bhadeshia;M. Kikuchi

文献摘要

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铌是汽车排气系统耐热铁素体不锈钢设计中的重要合金元素。当处于固溶体中时，它可以提高高温强度和抗热疲劳性。然而，它在使用过程中也会形成多种沉淀物。对这些反应进行了建模，考虑到扩散过程的多组分性质并考虑到毛细管效应。不仅可以估计 19Cr-0.8Nb 钢中 Fe2Nb（Laves 相）和 Fe3Nb3C (M6C) 碳化物的体积分数，还可以估计其粒径，与实验数据吻合良好。
Niobium is an important alloying element in the design of heat-resistant ferritic stainless steels for automotive exhaust systems. When in solid solution, it improves both the high temperature strength and the resistance to thermal fatigue. However, it also forms several kinds of precipitates during service. These reactions have been modelled, taking into account the multicomponent nature of the diffusion process and allowing for capillarity effects. It has been possible to estimate not only the volume fractions but also the particle sizes for Fe2Nb (Laves phase) and Fe3Nb3C (M6C) carbide in a 19Cr–0.8Nb steel, with good agreement against experimental data.