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通过TGA(热重分析)测定了在模拟热轧过程的1000℃～1200℃空气中304奥氏体不锈钢短期氧化过程的质量变化,并采用SEM、EDS、GDE-OES、XPS和XRD等手段观察和分析了氧化膜的形貌、组成与结构.结果表明:在1000℃和1100℃氧化60 min的时间内,304不锈钢的氧化过程基本遵从抛物线规律;在1200℃氧化16 min后,则出现了快速失稳氧化.在所有三个实验温度下氧化258 s,钢表面均能形成完整的氧化膜.在1000℃,氧化膜由(Cr_(1.3)Fe_(0.7))O_3组成,而在1100℃和1200℃的氧化膜,则有少量Mn_(1.5)Cr_(1.5)O_4生成.此外,随着氧化温度的提高,氧化膜表面的O含量明显升高,Fe和Ni含量下降,这与氧化膜的厚度有关.
The mass change of short-term oxidation of 304 austenitic stainless steel in 1000 ℃ ~ 1200 ℃ air was simulated by TGA (thermogravimetric analysis), and SEM, EDS, GDE-OES, XPS and XRD were used to observe the short- And the morphology, composition and structure of the oxide film were analyzed.The results showed that the oxidation process of 304 stainless steel obeyed the parabolic law at 1000 ℃ and 1100 ℃ for 60 min, and the oxidation appeared at 1200 ℃ for 16 min Rapid oxidation of unstabilized oxide.After oxidation for 258 s at all three experimental temperatures, a complete oxide film can be formed on the surface of the steel.At 1000 ℃, the oxide film consists of (Cr 1.3 Fe 0.7 O 3) (1.5) Cr_ (1.5) O_4, with the increase of the oxidation temperature, the content of O on the surface of the oxide film obviously increases and the content of Fe and Ni decreases, which is in agreement with that of the oxide film The thickness of the relevant.