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参照标准HB5258—2000中的增重法对不同铈含量的Cr12铁素体不锈钢的抗高温氧化性能进行测试,利用扫描电镜(SEM)、X射线衍射(XRD)技术等实验手段进行氧化形貌观察和氧化物物相分析,并对氧化物的生成热力学进行了计算.实验结果表明:氧化物的分析结果与热力学计算结果相吻合.在600℃、700℃及800℃较低温度时生成的氧化产物为具有尖晶石结构的M3O4型氧化物,具有良好的保护性,铈的添加可促进这种氧化膜的形成,降低氧化速率;在900℃时生成的氧化产物类型主要为M2O3型,保护性差,晶粒细的含铈钢初期氧化速率快,但是铈可改善氧化膜与基体的黏附性,在氧化后期阻止实验钢进一步的剧烈氧化.利用反应元素效应和晶粒尺寸效应可以较好地解释该氧化动力学机制.
The oxidation resistance of Cr12 ferritic stainless steels with different cerium contents was tested by using the weight gain method according to the standard HB5258-2000. The oxidation morphologies were observed by means of SEM and XRD. And oxide phase analysis, and calculated the thermodynamic formation of the oxide.The experimental results show that: the results of the oxide analysis and thermodynamic calculations are consistent with the results obtained at 600 ℃, 700 ℃ and 800 ℃ lower temperature oxidation The product is spinel M3O4-type oxide, with good protection, the addition of cerium can promote the formation of this oxide film, reducing the oxidation rate; the type of oxidation products generated at 900 ℃ mainly M2O3 type, the protection However, cerium can improve the adhesion of the oxide film to the matrix and prevent the further severe oxidation of the experimental steel during the later stage of oxidation. By using the reaction element effect and the grain size effect, the oxidation rate of the cerium- Explain this oxidation kinetics.