富Cr碳化物析出行为的热力学与动力学计算  

Thermodynamic and kinetic calculation on precipitation behavior of chromium carbide

作　　者：何燕霖[1] 朱娜琼[1] 吴晓瑜[1] 李麟[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《材料热处理学报》2011年第1期134-137,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(50971137);国家自然科学基金重点项目(50934011)

摘　　要：对时效处理条件下富Cr碳化物在Fe基多元合金中的演变行为进行了分析与计算。采用3DAP、XRD以及TEM技术表征了组织中碳化物的类型及尺寸随时间的变化,而后采用Thermo-Calc和PANDAT软件对碳化物的演变过程进行了热力学与动力学计算。结果表明:经800℃时效处理后合金组织中初始形核的相为M23C6型碳化物,10 min后该析出相的半径约为9 nm,而100 h后M23 C6型碳化物逐渐向稳定相M7 C3型碳化物转变;结合Thermo-Calc和PANDAT软件的计算结果可以较为准确地预测碳化物类型以及颗粒尺寸随时效时间的变化行为。Precipitation behavior of chromium carbide in a solution-treated multi-component Fe-based alloy aged for different time was analyzed and calculated.The evolution of carbide type and particle size with aging time is characterized by 3DAP,XRD and TEM.With Thermo-Calc and PANDAT software,thermodynamic and kinetic calculation on precipitation process of carbide is performed.It is shown that the initial phase precipitated in matrix is M23 C6 carbide with radius of about 9 nm in the alloy aged at 800 ℃ for 10 min.M23 C6 carbide changes into M7 C3 carbide after aging treatment for 100 h.The calculated results by Thermo-Calc and PANDAT software is in good agreement with the experimental observation.

关 键 词：铁基合金 富Cr碳化物 时效处理 热力学与动力学计算 3DAP 

分 类 号：TG156.92[金属学及工艺—热处理]