不同热处理时间下TaC_p/Fe复合材料的组织演变

Microstructure Evolution of TaC_p/Fe Composites under Different Heat-treatment Time

研究了不同热处理时间下碳化钽增强铁基复合材料的组织演变规律。应用XRD、SEM以及EDS等手段分析了反应层的显微结构,同时研究了反应层的动力学。实验结果表明,钽丝与灰铸铁之间的反应层为碳化钽。随着热处理时间增加,碳化钽层厚增加。当保温时间为5、7、10和15 min时,反应层厚度分别为3.81、5.59、9.32和11.44μm。经过计算,1100℃时的扩散系数为1.089×10^(-8 )cm^2/s。最后,给出了不同热处理时间下组织演变示意图,对其演变规律做了进一步解释。

The microstructure evolution of tantalum carbide reinforced iron matrix composites under the different heat-treatment time was studied.The kinetics and microstructure of the reaction layer were researched by means of XRD,SEM and EDS.The experimental results show that the reaction layer between tantalum wire and grey cast iron is a tantalum carbide layer.The thickness of the layer increases with the heat-treatment time increasing.The thicknesses of tantalum carbide layer are about 3.81,5.59,9.32 and 11.44μm at the holding time of 5,7,10 and 15 min,respectively.At 1100℃,the diffusion coefficient is 1.089×10-8cm2/s.In the end,the schematic diagram of the microstructure evolution was given under the different heat-treatment time,which further revealed the nature of the microstructure evolution.