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热变形条件下Fe-C-X合金钢γ →α相变的PLE/NPLE转变温度

刘志远 , 杨志刚 , 李昭东 , 张驰 , 盛广

金属学报

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 ℃.

关键词: PLE/NPLE转变 , ferrite transformation , hot deformation , local equilibrium

Analysis of Hydrogen Diffusion in Metals with Trapping under Local Equilibrium Assumption

YANG Ke CAO Mingzhou WAN Xiaojing SHI Changxu Institute of Metal Research.Academia Sinica , Shenyang , 110015 , China.Shanghai University of Technology.Shanghai , 200070 , China.

材料科学技术（英文）

The assumption of the local equilibrium of hydrogen distribution in metals[1]was used in the model formerly developed[2]to describe the diffu- sion of hydrogen in metals.From the assumption a direct relationship between the hydrogen diffusivity and the hydrogen concentration in metals is estab- lished as D=D_o/{1+N_x(k/p)/[1+C(k/p)]} The comparison between the two results drawn from the assumption of equilibrium and the dynam- ics of hydrogen trapping[3]was also presented.The computation results well explained the scattering phenomenon existed in hydrogen diffusion data and suggested that the experimental conditions should be identical for the study of hydrogen permeation in metals.

关键词: diffusion , null , null

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