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ZG1Cr10NiAlMoVNbN耐热钢在200～1 600 ℃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1 050 ℃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。
Abstract
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 containing 0.10%Al was single γ at 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 were γ＋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 single δ， 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.
关键词
关键词：耐热钢 /
Thermo-Calc /
δ 铁素体 /
冲击性能
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Key words
Key words: heat resistant steel /
Thermo-Calc /
δ-ferrite /
impact properties
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脚注
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基金
哈尔滨市成果转化项(2013DB4AG009）
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