Fe-Cr-Ni系不锈钢在热老化和退火过程中铁素体调幅分解的相场法研究

史佳庆, 薛飞, 彭群家, 沈耀

A Phase-Field Study on Spinodal Decomposition of Ferrite of Fe-Cr-Ni Stainless Steels during Thermal Ageing and Annealing

SHI Jiaqing, XUE Fei, PENG Qunjia, SHEN Yao

表1 相场模型使用的参数值

Table 1 Parameters used in the phase-field model

Descriptions Parameters Values Temperature/K T 683(ageing), 823(annealing)[19] Average Cr concentration in ferrite/%, atomic fraction c0 29.43[19] Average Ni concentration in ferrite /%, atomic fraction cNi 3.00[19] Gas constant/J·mol-1·K-1 R 8.314 Molar volume /m3·mol-1 Vm 7.125×10-6 Fractional linear expansion per unit Cr composition η 0.00614[44] Young's modulus/GPa E 200 Poisson's ratio μ 0.28 Interatomic distance/nm r0 0.2482[45] Adjustable parameter related to diffusion d 10.7 Diffusion coefficient of Fe/m2·s-1 DFe 1.0×10-4exp(-294?kJ?mol-1RT)[40] Diffusion coefficient of Cr/m2·s-1 DCr 0.2×10-4exp(-308?kJ?mol-1RT)[40]