中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2012年
5期
1176-1181
,共6页
非等温转变%解析模型%转变初始温度%近似方法
非等溫轉變%解析模型%轉變初始溫度%近似方法
비등온전변%해석모형%전변초시온도%근사방법
non-isothermal transformation%analytical model%initial transformation temperature%approximation
基于固态相变解析模型,提出推导非等温固态相变的转变分数的新解析方法.该方法将转变起始温度和精确的温度积分引入到解析模型,从而得到扩展的解析模型.计算表明,扩展的解析模型能够准确地预测计算得到的转变分数与转变速率.扩展的解析模型与原有解析模型相比,它能够更加准确地描述相变过程的动力学行为.在转变初始温度较高的情况下,扩展的解析模型具有优越性.同时,从扩展的解析模型得到的动力学参数比原有解析模型的更合理、准确.
基于固態相變解析模型,提齣推導非等溫固態相變的轉變分數的新解析方法.該方法將轉變起始溫度和精確的溫度積分引入到解析模型,從而得到擴展的解析模型.計算錶明,擴展的解析模型能夠準確地預測計算得到的轉變分數與轉變速率.擴展的解析模型與原有解析模型相比,它能夠更加準確地描述相變過程的動力學行為.在轉變初始溫度較高的情況下,擴展的解析模型具有優越性.同時,從擴展的解析模型得到的動力學參數比原有解析模型的更閤理、準確.
기우고태상변해석모형,제출추도비등온고태상변적전변분수적신해석방법.해방법장전변기시온도화정학적온도적분인입도해석모형,종이득도확전적해석모형.계산표명,확전적해석모형능구준학지예측계산득도적전변분수여전변속솔.확전적해석모형여원유해석모형상비,타능구경가준학지묘술상변과정적동역학행위.재전변초시온도교고적정황하,확전적해석모형구유우월성.동시,종확전적해석모형득도적동역학삼수비원유해석모형적경합리、준학.
Departing from an analytical phase transformation model,a new analytical approach to deduce transformed fraction for non-isothermal phase transformation was developed.In the new approach,the effect of the initial transformation temperature and the accurate "temperature integral" approximations are incorporated to obtain an extended analytical model.Numerical approach demonstrated that the extended analytical model prediction for transformed fraction and transformation rate is in good agreement with the exact numerical calculation.The new model can describe more precisely the kinetic behavior than the original analytical model,especially for transformation with relatively high initial transformation temperature.The kinetic parameters obtained from the new model are more accurate and reasonable than those from the original analytical model.
