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--C0.073--Mn2.17--Si0.80--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 ℃.
In this research the PLE(Partition Local Equilibrium)/NPLE(Negligible Partition Local Equilibrium) model has been introduced into the deformed system to describe the γ→α transformation of Fe-C-Xi alloy(Xi represents for one or several substitutional elements such as Mn, Si, Cr, etc). Based on a calculate method in static system which has been reported, a thermodynamic equation which suits the plastic deformed system is established under the orthoequilibrium model, to calculate the PLE-NPLE critical temperature. Isothermal γ→α transformation experiments have been conducted to a Fe-C0.073-Mn2.17-Si0.80-Cr0.88(wt%) steel under different temperatures after a process of hot deformation at 820℃and the critical temperature of PLE-NPLE is roughly mensurated. The experimental results correspond well with the calculated results and both of them reveal that deformation does heighten the critical temperature of PLE-NPLE, as for the tested steel in this paper, after a 40% nominal deformation at 820℃ by deformed rate of 0.5s-1, the critical temperature of PLE-NPLE in isothermal γ→α transformation has been heighten by nearly 10℃.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] |
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