【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℃。更多还原

【Abstract】 The PLE（partition local equilibrium）/NPLE（negligible partition local equilibrium） model was introduced into the deformed system to describe theγ→αtransformation 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.Isothermalγ→αtransformation experiments were conducted to a Fe-C0.073-Mn2.17-Si0.80-Cr0.88（mass fraction,%）steel under different temperatures after hot defor- mation 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 isothermalγ→αtransformation was raised nearly 10℃.更多还原