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采用Thermo-Calc热力学计算软件对Nb-Ti-IF钢在0~1600℃存在的平衡析出相进行了热力学计算,讨论了合金元素Nb和Ti含量对含Nb、Ti平衡析出相的影响。此外,对Fe Ti P相的平衡析出进行了热力学计算,并将计算与显微分析结果进行对比。结果表明,Nb-Ti-IF钢中平衡析出相主要有:FCC_A1#1、FCC_A1#2、LAVES_PHASE_C14、Ti4C2S2、Mn S及M3P。Ti含量对各含Ti析出相的影响规律如下:≥0.045%Ti,Ti含量变化对FCC_A1#1相的析出几乎没有影响;<0.045%Ti,Ti含量变化对FCC_A1#1相的析出开始产生较明显的影响。≥0.05%Ti,Ti含量变化对Ti4C2S2相的析出影响较小,而当<0.05%Ti时,Ti含量对Ti4C2S2相的析出影响十分明显。合金元素Nb、Ti的最佳添加量分别为0.02%和0.05%。
The thermodynamic calculation of equilibrium precipitates existing in Nb-Ti-IF steel at 0-1600 ℃ was carried out by Thermo-Calc thermodynamic calculation software. The effects of alloying elements Nb and Ti content on the equilibrium precipitates including Nb and Ti were discussed. In addition, the thermodynamic calculation of equilibrium precipitation of Fe Ti P phase was carried out, and the calculation and the results of microscopic analysis were compared. The results show that the equilibrium precipitates in Nb-Ti-IF steel are FCC_A1 # 1, FCC_A1 # 2, LAVES_PHASE_C14, Ti4C2S2, MnS and M3P. The influence of Ti content on Ti-containing precipitates is as follows: ≥0.045% Ti, Ti content has almost no effect on the precipitation of FCC_A1 # 1 phase; <0.045% Ti, Ti content changes on the precipitation of FCC_A1 # 1 phase Obvious impact. ≥0.05% Ti, Ti content changes on the precipitation of Ti4C2S2 phase less, and when <0.05% Ti, Ti content on the precipitation of Ti4C2S2 phase is very obvious. The optimum additions of alloying elements Nb and Ti are 0.02% and 0.05%, respectively.