底吹氮气V-N微合金化研究  

Research on V-N Microalloying with Bottom Blowing Nitrogen

作　　者：李皓 王书桓 倪国龙 张存帅 佟帅 LI Hao;WANG Shuhuan;NI Guolong;ZHANG Cunshuai;TONG Shuai(School of Metallurgy and Energy,North University of Technology,Tangshan Hebei 063210,China;Tangshan Key Laboratory of Special Metallurgy and Materials Preparation,Tangshan Hebei 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]唐山市特种冶金及材料制备重点实验室,河北唐山063210

出　　处：《上海金属》2023年第3期69-74,共6页Shanghai Metals

基　　金：河北省自然科学基金重点项目(E2019209597);河北省自然科学基金(E2020209014);国家自然科学基金(51774139);河北省科技计划(20311003D)。

摘　　要：鉴于传统微合金化工艺所用钒氮合金具有成本高、能耗高、制备周期长等不足,提出了采用添加钒铁+底吹氮气的方式实现钢液快速增氮,从而达到V-N微合金化的目的。通过对不同底吹参数钢中氮含量的分析、珠光体组织表征和晶粒度评级、析出相诱导晶内铁素体形核机制分析,明确了在含钒钢液中底吹氮气可以实现快速增氮,氮含量随底吹时间的增加而提高,且氮含量越高越有利于晶粒细化、促进钢中V(C,N)的析出并使其分布更加弥散,证明添加钒铁+底吹氮气进行V-N微合金化是可行的。In view of the disadvantages such as high cost,high energy consumption and long production period for vanadium-nitrogen alloy used in the traditional microalloying process,the methods of adding ferrovanadium and bottom blowing nitrogen was proposed to realize rapid increase in nitrogen in liquid steel thereby achieve the purpose of V-N microalloying.Based on the analysis on nitrogen content in steels with different bottom blowing parameters,the characterization of pearlitic structure and grain size rating,and the analysis on nucleation mechanism of intragranular ferrite inducted by precipitates,it was confirmed that bottom blowing nitrogen could achieve the rapid increase in nitrogen in the liquid steel containing vanadium.The nitrogen content increased with the increase of bottom blowing time,and the higher the nitrogen content,the finer the grain was,and thus promoted the precipitation and more dispersed distribution of V(C,N)in steel,which proved that the V-N microalloying by adding ferrovanadium and bottom blowing nitrogen was feasible.

关 键 词：V-N 微合金化 底吹氮气 析出相 晶粒细化 

分 类 号：TF646[冶金工程—钢铁冶金]