(1. 華北理工大學(xué) 冶金與能源學(xué)院，唐山 063210；
2. 昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093；
3. 鋼鐵研究總院工程用鋼研究所，北京 100081)
摘 要: 為了實(shí)現(xiàn)在工業(yè)化生產(chǎn)中對(duì)α鈦富氧層厚度預(yù)測(cè)和控制，通過(guò)實(shí)驗(yàn)研究α鈦富氧層在高溫空氣環(huán)境中的形成及增厚過(guò)程，討論熱處理溫度和時(shí)間的影響作用，建立高溫（750~850 ℃）空氣環(huán)境下關(guān)于溫度、時(shí)間的富氧層增厚動(dòng)力學(xué)模型。結(jié)果表明：當(dāng)恒溫?zé)崽幚頊囟葹?50~850 ℃時(shí)，α鈦富氧層厚度x與保溫時(shí)間t0.5呈正比例關(guān)系，且升高熱處理溫度可顯著提高富氧層增厚速度。在此溫度范圍內(nèi)，氧原子的擴(kuò)散激活能約為203473 J/mol，計(jì)算曲線與實(shí)驗(yàn)數(shù)據(jù)吻合性較好。結(jié)合文獻(xiàn)中已有的擴(kuò)散系數(shù)方程和實(shí)驗(yàn)測(cè)得的富氧層厚度數(shù)據(jù)，推導(dǎo)得到5個(gè)富氧層增厚動(dòng)力學(xué)方程，其中3個(gè)方程的計(jì)算曲線與實(shí)驗(yàn)數(shù)據(jù)吻合性較好，可為實(shí)際生產(chǎn)中預(yù)估富氧層厚度提供理論支持。
關(guān)鍵字: α鈦；富氧層；氧原子；擴(kuò)散；動(dòng)力學(xué)計(jì)算
（1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China;
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3 Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China）
Abstract:In order to predict and control the thickness of oxygen rich layer of α-titanium in industrial production, the formation and thickening processes of oxygen rich layer of α-titanium in high temperature air environment were studied by experiments. The effects of heat treatment temperature and time on the thickness of oxygen rich layer were discussed, and a kinetic model for the thickening of α-titanium rich oxygen layer at high temperature (750-850 ℃) was established. The results show that when the constant temperature is 750-850 ℃, the thickness of oxygen rich layer x and holding time t0.5 of α-titanium plate increase linearly, and the increase of heat treatment temperature can significantly increase the thickening rate of oxygen rich layer. In this temperature range, the diffusion activation energy of oxygen atom is about 203473 J/mol, and the calculated curves are in good agreement with the experimental data. Based on the existing diffusion coefficient equation in the literature and the thicknesses of the oxygen rich layer measured by the experiments, five dynamic equations of oxygen rich layer thickening are derived, three of which are in good agreement with the experimental data and can be used to predict the thickness of oxygen rich layer.
Key words: α-Ti; oxygen rich layer; oxygen atom; diffusion; dynamic calculation
