(1. 上海交通大學 材料科學與工程學院, 上海 200030;
2. 太原理工大學 表面工程研究所, 太原 030024)
摘 要: 雙層輝光離子滲WMo后由于冷卻速度緩慢，滲層中尤其在晶界上出現大量析出物，造成滲層質量嚴重下降，雖后經固溶處理，但由于其組織遺傳等原因，依然造成不良影響。針對這個問題，首先采用恒電流電解萃取析出物，然后用X射線衍射法對析出物進行定性分析， 結果表明析出物主要為 μ 相； 其次應用金相法和定量金相分析儀測定了析出相的等溫轉變動力學圖，該圖表明析出相分別在950 ℃和1 150 ℃達到轉變高峰， 孕育期分別為6～8 min和4～5 min。
關鍵字: 雙層輝光離子； 滲WMo； μ相； TTT圖
（1. School of Materials Science and Technology, Shanghai Jiaotong University, Shanghai 200030, P.R.China;
2. Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R.China）
Abstract: Because of the slow cooling speed after 20 steel alloyed by WMo plasma, a lot ofprecipitation is produced in the WMo alloying layers, especially at the grain boundaries. In spite of the solution heat treatment, the layer quality is negatively influenced due to microstructure inheritance. In order to get rid of or restrain the formation of the precipitated phases, the following work has been done: qualitative phase analysis of the precipitates by Xray diffraction, examination of their isotherms by means of quantitative metallographic analyzerand analysis of SEM images of the precipitation.
Key words: TTT diagram； double glow plasma surface alloying； tungstenmolybdenum alloying; μ phase
