利用透射扫描电镜和能谱仪对Nb-V微合金化钢中Nb和V析出相进行了研究,发现Nb和V在高温形变和连续冷却中,与C,N形成一种复杂的有序碳氮化物,其中Nb与V的含量是可变的,其浓度比值(C_(Nb)/C_V)随着析出颗粒尺寸的减小而递减,化学式可写成(Nb,V)(C_(1-x),N_(1-y))。电镜观察表明,它们的形貌特征以及与基体的位向关系,同铌钢和钒钢中的析出相一致。
The precipitation of Nb and V in Nb-V steel has been investigated by means of STEM and EDAX. It Was found that a complex ordered carbonitride is formed on hot-rolling and continuous cooling by the precipitation of Nb and V together with C and N in which the contents of Nb and V are changeable. Its concentration ratio, C_(Nb)/C_v, decreases with the decrease of the grain size precipitated. The stoichiometric formula of the precipitate may be (Nb, V) (C_(1-x), N_(1-y)). Electronic microscopic observation revealed that both the morphology characteristics and the crystallographic orientation of the precipitate seem to be identical with ones either in the Nb- or V-steel.
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