采用Thermo-Calc热力学软件与试验研究相结合的方法，模拟分析了3种不同铝质量分数的ZG1Cr10NiAl-MoVNbN耐热钢在200～1600℃之间存在的平衡相和非平衡凝固过程，研究了3种试验钢的显微组织，并对其进行了冲击试验。结果表明：在1050℃时，质量分数为0.10%的铝试验钢的平衡相为γ单相；质量分数为0.91%的铝试验钢的平衡相为γ相＋δ铁素体相；质量分数为3.67%的铝试验钢的平衡相为δ铁素体单相，模拟结果与试验结果较为吻合，同时，随着钢中铝质量分数的升高，冲击功大幅下降，冲击试样的断裂方式由韧窝断裂变为解理断裂。
With Thermo-Calc software and experiments,the equilibrium phases existing in ZG1Cr10NiAlMoVNbN heat-resistant steel from 200 to 1 600℃and equilibrium solidification process were calculated. The microstructures and impact properties of three kinds of tested steels were investigated. Results show that the equilibrium phases of the tested steel con-taining 0.10%Al was singleγat 1 050℃,after the heat-treatment,austenitic transformed into martensitic completely, which is consistent with the experimental results. The equilibrium phases of the tested steel containing 0.91%Al wereγ+δ,which agrees well with the observed microstructure that consists of martensitic and austenitic. And the equilibrium phases of the tested steel containing 3.67%Al was singleδ,which agrees well with the experimental results. Meanwhile, the impact energy reduced significantly with the increase of Aluminum content,the fracture mechanism changed from the dimple fracture to cleavage fracture.
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