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为观察Fe-Mn-Al-C系高Al低密度钢在高温下的抗氧化性能,采用氧化增重法测定了4种合金在950~1 100℃下的氧化动力学曲线。通过SEM观察氧化层形貌特征,利用线扫描能谱分析氧化后合金元素的变化,分析了28Mn-10Al合金氧化膜发生膨胀破裂的原因。结果表明,Al元素提高钢的抗氧化性,而Mn元素则降低Al的抗氧化性。抗氧化性较好的28Mn-12Al、20Mn-10Al合金表层未发现Fe的氧化,而氧化严重的28Mn-8Al合金氧化层Fe元素含量较高。28Mn-12Al合金抗氧化性最好,氧化膜的连续性及致密性优于其他3种合金,氧化物连续且晶粒细小,在氧化过程中具有一定的防护作用。
In order to observe the oxidation resistance of Fe-Mn-Al-C high Al low density steel at high temperature, the oxidation kinetics curves of four alloys at 950 ~ 1 100 ℃ were measured by oxidation-weighting method. The morphologies of the oxide layer were observed by SEM. The changes of alloying elements after oxidation were analyzed by scanning electron microscope (SEM), and the reasons for the rupture of 28Mn-10Al alloy oxide film were analyzed. The results show that Al improves the oxidation resistance of steel, while Mn decreases the oxidation resistance of Al. The better oxidation resistance of 28Mn-12Al, 20Mn-10Al alloy surface layer found no oxidation of Fe, while the oxidation of 28Mn-8Al alloy oxide layer Fe content is higher. The oxidation resistance of 28Mn-12Al alloy is the best. The continuity and compactness of the oxide film is better than the other three alloys. The oxide is continuous and the grain is fine. It has a certain protective effect in the oxidation process.