SUS430不锈钢纳米表层的高温氧化行为
发布时间：2019-05-29 20:47
【摘要】：通过高能喷丸方法在SUS430不锈钢表面制备纳米表层,利用X射线衍射(XRD)、热分析(TGA)、扫描电镜(SEM)及能谱(EDS)进行测试,研究了纳米表层在不同气氛中的高温氧化行为,并分析了表面自身纳米化对SUS430不锈钢耐氧化性能的影响。结果表明:纳米表层在氧化初期氧化强烈,呈线性规律迅速增重,但达到钝化的时间短,氧化膜薄且致密,厚度仅为原始表面氧化膜的1/4,使钝化以后的氧化速率比原始表面低,总的氧化增重仅为原始表面的1/3,耐氧化性大大提高。其原因是表面自身纳米化处理增加了表层的晶界面积,提高了氧化物的形核几率,也为元素的扩散提供了更多通道,因而促进了Cr元素的选择性氧化。在最表层形成的是疏松的富Fe氧化物,该层氧化物对耐氧化性的提高贡献不大,在靠近基体的底层形成致密的富Cr氧化物,能很好地抵抗基体的进一步氧化;纳米表层比原始表面更容易形成连续的氧化膜,该氧化膜的内应力小,韧性好,与基体的结合力强。
[Abstract]:Nano-surface layer was prepared on the surface of SUS430 stainless steel by high energy shot peening. X-ray diffraction (XRD), thermal analysis (TGA), scanning electron microscope (SEM) and energy spectrum (EDS) were used to test. The oxidation behavior of nano-surface layer at high temperature in different atmosphere was studied, and the effect of surface self-nanomerization on the oxidation resistance of SUS430 stainless steel was analyzed. The results show that the oxidation of nano-surface layer is strong in the initial stage of oxidation, and the weight gain is linear, but the passivation time is short, the oxidation film is thin and dense, and the thickness is only 1 鈮，
本文编号：2488215
[Abstract]:Nano-surface layer was prepared on the surface of SUS430 stainless steel by high energy shot peening. X-ray diffraction (XRD), thermal analysis (TGA), scanning electron microscope (SEM) and energy spectrum (EDS) were used to test. The oxidation behavior of nano-surface layer at high temperature in different atmosphere was studied, and the effect of surface self-nanomerization on the oxidation resistance of SUS430 stainless steel was analyzed. The results show that the oxidation of nano-surface layer is strong in the initial stage of oxidation, and the weight gain is linear, but the passivation time is short, the oxidation film is thin and dense, and the thickness is only 1 鈮，
本文编号：2488215
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