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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。
The evolution behavior of Cr-rich carbide in Fe-based multi-component alloys under aging condition was analyzed and calculated. The changes of the type and size of the carbides in the microstructure were characterized by 3DAP, XRD and TEM. Then the thermodynamics and kinetics of carbides evolution were calculated by Thermo-Calc and PANDAT software. The results show that the initial nucleation phase of the alloy after aging at 800 ℃ is M23C6 carbide, and the radius of the precipitated phase is about 9 nm after 10 min. After 100 h, the M23 C6 carbides gradually migrate to the stable phase M7 C3 carbide transformation. Combined with the calculation results of Thermo-Calc and PANDAT software, it is possible to predict more accurately the types of carbides and the variation of particle size with the aging time.