摘要
在已有合金元素的再分配和不分配局部平衡(PLE/NPLE)转变温度的理论计算方法基础上,考虑热变形的影响,建立了热变形条件下Fe-C-X(X表示Mn,Si,Cr等一种或几种元素)合金钢的正平衡热力学方程,从而求解热变形体系的PLE/NPLE转变温度.并利用Gleeble-1500D热力模拟试验机进行了Fe-CO.073-Mn2.17-SiO.80-Cr0.88(质量分数,%)合金钢的热变形γ→α等温转变实验,根据金相照片估测了实验用钢的PLE/NPLE转变温度,实验估测值与理论计算值基本符合,820℃以0.5 s^(-1)的应变速率对实验用钢加载40%的名义应变,其γ→α等温转变的PLE/NPLE转变温度提高了近10℃。
The PLE （partition local equilibrium） /NPLE （negligible partition local equilibrium） model was introduced into the deformed system to describe the γ→α transformation in Fe-C-X alloy steel （X represents for one or several substitutional elements such as Mn, Si, Cr, etc.）. On the basis of the calculation method in static system reported, a thermodynamic equation which suits for the plastic deformed system was established under the orthoequilibrium model and used to calculate the PLE/NPLE critical temperature. Isothermal γ→α transformation experiments were conducted to a Fe-C0.073 Mn2.17-Si0.80-Cr0.88 （mass fraction, %） steel under different temperatures after hot deformation at 820 ℃ and the critical temperature of PLE/NPLE was roughly measured. The experimental results correspond well with the calculated ones. For the tested steel after a 40% nominal deformation at 820 ℃ and deformed rate of 0.5 s^-1, the critical temperature of PLE/NPLE in isothermal γ→α transformation was raised nearly 10 ℃.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第6期703-707,共5页
Acta Metallurgica Sinica
基金
高等学校博士学科点专项科研基金资助课题20070003006
关键词
Fe-C—X合金钢
相变模型
铁素体
热变形
局部平衡
Fe-C-X alloy steel, transformation model, ferrite, hot deformation, local equilibrium
作者简介
刘志远，男，1986年生，硕士生
Correspondent： YANG Zhigang, professor, Tel： （010）62783848, E-mail： zgyang@tsinghua.edu.cn
