Al对铁素体耐热钢析出相影响的模拟计算

Simulation Calculation of the Effect of Al on Precipitate Phase of Ferritic Heat Resistant Steel

在T92耐热钢成分基础上对其进行优化,利用Thermo-Calc热力学软件计算了试验钢的平衡析出相,重点研究了Al元素对耐热钢析出物的影响规律。结果表明,当Al含量小于4%时,Al对Laves相、M23C6相的析出量影响较小,但会提高Laves相和M23C6相的开始析出温度;Al对Z相的影响较大,当Al含量小于4%时,Z相析出量与开始析出温度都有所下降,而Al含量为4%时几乎不析出Z相;Al对σ相的影响也较为明显,Al对σ相的析出量及开始析出温度影响比较复杂,但当Al含量为4%时几乎无σ相析出。

Optimized on the composition of T92 heat resistant steel,the equilibrium precipitation phase of test steel was calculated by Thermo-Calc thermodynamics software,and the influence rule of Al on the precipitates of the heat-resistant steel was emphatically studied.The results show that when Al content is less than 4%,Al has little effect on the precipitation of Laves phase and M23C6 phase,but increases the initial precipitation temperature of Laves phase and M23 C6 phase;Al has a great influence on Z phase,when Al content is less than 4%,both the precipitation amount and the initial precipitation temperature of Z phase decrease,and when Al content is more than 4%,almost no Z phase is precipitated;The influence of Al on the formation of aσphase is also obvious.The influence of Al on the number ofσphases and the initial precipitation temperature is complex,but when the content of Al is 4%,there is almost noσphase precipitation.