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本文研究不同含量的钇和铈对马氏体时效不锈钢00Cr11NilOMo2Ti在700～900℃下氧化性能的影响。钇和铈使该钢的抗氧化性大幅度提高,超过绝大部分文献所报导的改善程度。微量的钇(0.018～O.39％Y)或铈(0.019～0.044％Ce)可使该钢800℃的氧化增重减少大约20倍,并使氧化动力学曲线从近似直线型变为抛物线型。 通过扫描电镜、X射线衍射及能谱分析、俄歇电子谱分析等手段研究了钇和铈的作用机构,认为它们主要有三种有益的作用:1)抑制须状Fe_2O_3的生成,促进保护性的Cr_2O_3形成。2)提高Cr_3O_3氧化皮的化学稳定性,防止或推迟Cr_2O_3的变质崩溃。3)产生伸入基体的氧化皮“钉子”,提高氧化皮的附着能力。
In this paper, the effects of different contents of yttrium and cerium on the oxidation properties of martensite-aged stainless steel 00Cr11NilOMo2Ti at 700-900 ℃ were studied. Yttrium and cerium greatly improve the oxidation resistance of the steel, exceeding the improvement reported by most of the literature. Trace amounts of yttrium (0.018-0.39% Y) or cerium (0.019-0.044% Ce) reduced the oxidation weight gain of this steel by about 20 times at 800 ° C and changed the oxidation kinetics curve from an approximately linear to a parabolic . The mechanism of action of yttrium and cerium was studied by means of scanning electron microscopy, X-ray diffraction and energy spectrum analysis, Auger electron spectroscopy and so on. They are believed to have three beneficial effects: 1) inhibition of the formation of whisker Fe_2O_3 and promotion of protective Cr 2 O 3 formation. 2) improve the chemical stability of Cr_3O_3 scale to prevent or postpone the deterioration of Cr_2O_3 collapse. 3) produce the oxide scale into the substrate “nails” to improve the adhesion of the scale.