H13钢RE-N-C-V-Nb多元共渗层形成机理及生长动力学  

Mechanism and kinetics of RE-N-C-V-Nb multi-component thermo chemical treated layer of H13 steel

作　　者：庞祖高[1] 黄柏嵩 单朝军[1] 黄银燕[1] 韦曼云[1] 马宽猷[1] 

机构地区：[1]广西大学材料科学与工程学院,广西南宁530004

出　　处：《金属热处理》2013年第3期17-20,共4页Heat Treatment of Metals

基　　金：广西自然科学基金(2010GXNSFA013020);广西高校大学生创新创业计划项目

摘　　要：采用X射线衍射、扫描电镜、能谱分析等手段分析H13钢RE-N-C-V-Nb盐浴共渗层的组织及形成机理,依据Fick定律和Arrhenius公式建立了多元共渗层生长与工艺参数之间定量的动力学数学模型。结果表明,钒铌氮碳化物共渗层的形成是钒铌原子与从基体扩散到渗层的氮碳原子结合的结果,渗层主要含NbN、NbC、VN、V8C7相。在一定温度下,渗层厚度随热处理时间的增长呈抛物线规律变化,钒铌氮碳化物层厚度生长动力学公式为s=6.0×10-4(t.exp(-10159.02)T)^(1/2)。Microstructure and formation micromechanism of RE-N-C-S-V-Nb permeated layer of H13 steel were investigated by X-ray diffraction, SEM, energy spectrum analysis. The quantitative kinetic mathematical model between multi-component permeated layer and process parameters was established by Fick＇s laws and Arrhenius equation. The results show that the formation of vanadium niobium carbonitride is the result of nitrogen and carbon atoms diffusion from substrate to coating and reacting with vanadium and niobium atoms. The layer mainly consists of NbN, NbC, VN, VsC7 phases. The thickness of the layer versus time is conforming to parabolic rule at a same （ 1~1~9~~/ temperature. Thickness growth kinetics formula of vanadium and niobium earbonitride is s = 6.0 x 10-4√t·exp（-10159.02/T）

关 键 词：H13钢 多元共渗 钒铌氮碳化物 动力学 

分 类 号：TG156.8[金属学及工艺—热处理]