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对两种耐火钢在室温和600℃进行拉伸力学实验,一种不含钒元素,一种钒元素含量为0.11at%,并用透射电镜(TEM)和原子探针层析技术(APT)观察这两种耐火钢的显微组织和分析合金元素的三维空间分布。结果表明,含钒元素实验钢中为(Nb,V)C碳化物,不含钒元素实验钢中为NbC碳化物,且含钒元素实验钢中碳化物数量远远高于不含钒元素实验钢,碳化物尺寸也稍大于不含钒元素实验钢。这表明耐火钢中适当含量的钒元素可以促进碳化物的弥散析出,增强析出强化作用,提高耐火钢室温和在600℃的力学性能。
Tensile tests on two kinds of refractory steels were carried out at room temperature and 600 ℃. One vanadium-free element and one vanadium element were 0.11at%, and were observed by transmission electron microscopy (TEM) and atomic probe spectroscopy (APT) The microstructure of these two refractory steels and the analysis of the three-dimensional spatial distribution of alloying elements. The results show that (Nb, V) C carbides in vanadium-bearing experimental steels and NbC carbides in vanadium-free experimental steels, and the amount of carbides in vanadium-bearing experimental steels is much higher than that of vanadium- Steel, carbide size is also slightly larger than the experimental vanadium-free steel. This shows that the appropriate content of refractory steel vanadium elements can promote the dispersion of carbide precipitation, enhanced precipitation strengthening effect, and improve the mechanical properties of fire-resistant steel room temperature at 600 ℃.