HRB500E微合金化钢筋中钒的化合物析出行为  

Precipitation behavior of vanadium compounds in HRB500E microalloyed steel bars

作　　者：尤景田 黎志英[1,2] 王劼 黄胜[1,2] 曾泽芸 黎世旺 杨光凯 李长荣 YOU Jing-tian;LI Zhi-ying;WANG Jie;HUANG Sheng;ZENG Ze-yun;LI Shi-wang;YANG Guang-kai;LI Chang-rong(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;Guizhou Province Key Laboratory of Metallurgical and Process Energy Saving,Guiyang 550025,China;Shougang Shuicheng Iron and Steel(Group)Co Ltd,Liupanshui 553000,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵州贵阳550025 [3]首钢水城钢铁(集团)有限责任公司,贵州六盘水553000

出　　处：《材料热处理学报》2023年第2期100-108,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52074095);贵州省科技厅科技支撑项目[2022]053。

摘　　要：分析了HRB500E微合金化高强度钢筋中钒的氮化物、碳化物和碳氮化物分别在液相、凝固过程、奥氏体以及铁素体相中的析出热力学条件,并研究了它们在实验钢连铸或热处理过程中的析出规律。结果表明:实验钢中,钒的碳化物和氮化物在钢液中不析出。碳氮化钒(VC_(x)N_(1-x))中的x值随温度降低而增大,即在高温平衡条件下析出富氮的碳氮化物,在全固溶温度1450 K下析出物为VC_(0.03)N_(0.97)。VN在1176~1448 K温度区间内在奥氏体相中析出,温度低于1176 K时,主要析出物为碳化钒或碳氮化钒。实验钢铁素体相中也观察到有钒的化合物析出,呈椭圆形,析出规律与热力学分析结果基本吻合。The precipitation thermodynamic conditions of vanadium nitride,vanadium carbide and vanadium carbonitride in the liquid phase,solidification process,austenite and ferrite phase in HRB500E microalloyed high-strength steel bars were analyzed,and their precipitation laws in the continuous casting or heat treatment process of the experimental steel were studied.The results show that in the experimental steel,the carbides and nitrides of vanadium do not precipitate in the molten steel.In vanadium carbonitride(VC_(x)N_(1-x)),the value of x increases with the decrease of temperature,that is,nitrogen rich carbonitride is precipitated under the high temperature equilibrium condition,and the precipitate is VC_(0.03)N_(0.97)at the complete solution temperature of 1450 K.VN precipitates in austenite phase in the temperature range of 1176-1448 K.When the temperature is lower than 1176 K,the main precipitates are vanadium carbide or vanadium carbonitride.Vanadium compounds are also observed in the ferrite phase of the experimental steel,which is elliptical,and the precipitation law is basically consistent with the thermodynamic analysis results.

关 键 词：高强度钢筋 热力学 碳化钒 氮化钒 碳氮化钒 

分 类 号：TG142.3[一般工业技术—材料科学与工程]