Herein, a novel method of V–N micro-alloying was developed by adding ferrovanadium and nitrogen bottom blowing. For comparison, melting experiments were carried out by directly adding ferrovanadium nitride. Results indicate that nitrogen content increases rapidly and can reach the actual production level via nitrogen bottom blowing. TEM observations show that carbonitrides precipitate along the dislocation line, on the boundary of cementite and ferrite–cementite, and the ferrite grain boundary. Meanwhile, higher the nitrogen content in the steel, more the precipitates and higher dispersion will form, which indicates that addition of ferrovanadium first is better than blowing nitrogen first. Furthermore, the size, distribution and dispersion of carbonitrides obtained via the method of firstly adding ferrovanadium are comparable with that of directly adding ferrovanadium nitride. The results reveal that it is feasible to realize V–N micro-alloying by adding ferrovanadium and nitrogen bottom blowing.

在这里，通过添加钒铁和氮气底吹，开发了一种V–N微合金化的新方法。为了比较，通过直接添加氮化铁钒进行熔融实验。结果表明，氮含量迅速增加，通过吹氮吹底可以达到实际生产水平。透射电镜观察表明，碳氮化物沿位错线在渗碳体与铁素体－渗碳体的边界以及铁素体晶粒边界上沉淀。同时，钢中的氮含量越高，就会形成更多的沉淀物和更高的分散度，这表明先加入钒铁比先吹氮更好。此外，尺寸 通过首先添加钒铁的方法获得的碳氮化物的分布和分散性与直接添加氮化铁钒的方法相当。结果表明，通过添加钒铁和氮气底吹来实现钒氮微合金化是可行的。