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双层辉光离子渗W Mo后由于冷却速度缓慢 ,渗层中尤其在晶界上出现大量析出物 ,造成渗层质量严重下降 ,虽后经固溶处理 ,但由于其组织遗传等原因 ,依然造成不良影响。针对这个问题 ,首先采用恒电流电解萃取析出物 ,然后用X射线衍射法对析出物进行定性分析 ,结果表明析出物主要为 μ相 ;其次应用金相法和定量金相分析仪测定了析出相的等温转变动力学图 ,该图表明析出相分别在 950℃和 1 1 50℃达到转变高峰 ,孕育期分别为 6～ 8min和 4～ 5min。
Due to the slow cooling rate, a large amount of precipitates appear in the diffusion layer, especially in the grain boundary, resulting in a serious decrease of the quality of the diffusion layer even though the solution is treated by the double-layer glow ion. However, due to its tissue genetic and other reasons, Cause adverse effects. In order to solve this problem, the precipitates were first extracted by galvanostatic electrolysis, and then the precipitates were qualitatively analyzed by X-ray diffraction. The results showed that the precipitates were mainly μ phase. Secondly, the phases of precipitates were determined by metallographic method and quantitative metallographic analyzer The kinetics diagram was transformed. The figure shows that the precipitated phases reach the peak of transformation at 950 ℃ and 1150 ℃ respectively, and the incubation periods are 6 ~ 8min and 4 ~ 5min, respectively.