L.Q. Ma
金属学报(英文版)
By using isothermal double hit compression tests and applying the 2% offset method, a new model was developed to predict the microstructural evolution of Nb-bearing steels at temperatures above and below the start temperature of strain-induced precipitation (TP). The TP was developed as a function of true strain, initial austenite grain size and the Nb content. The activation energy of static recrystallization (Qrex) was expressed as a function of the content of different alloy elements. It was found that Nb played the most important role in increasing the value of Qrex. The microstructural observations and measurements confirmed the validity of the model developed in the present investigation.
关键词:
Nb-bearing steel
,
静态再结晶
,
析出开始温度
,
激活
徐掌印
,
赵增武
,
姜银举
,
李保卫
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20140275
含铌铁水通过脱碳保铌探索作为合金化元素回收铁水中铌并直接冶炼为含铌微合金钢的方法。试验在真空碳管炉内进行，铁水温度为1500℃，氧化剂为Fe2O3，真空度为10 Pa，分别进行有SiO2-CaO-Al2O3系造渣剂、无渣真空氧化冶炼研究。结果表明：在无渣条件下，加入Fe2O3铁水中硅、铌和碳同时氧化，不能脱碳保铌；加入造渣剂时，造渣剂的碱度越低，铁水中的硅氧化量越低，碳氧化量越高，碳质量分数最低下降到0.032%，铌质量分数最低值从0.09%下降到0.082%；碱度越高，铁水中硅氧化量越高，铌的氧化量也越高；真空氧化冶炼能够促进碳氧化，减少硅的氧化，抑止铌氧化。在50 kg级真空感应电炉内成功进行了回收铁水中铌直接冶炼为含铌钢试验，为回收含铌铁水中的铌提供新方法，也为工业化直接冶炼含铌钢提供试验依据。
关键词:
含铌铁水
,
Fe2O3
,
真空氧化冶炼
,
脱碳保铌
,
含铌钢
