Abstract Manganese (Mn) addition was found to remarkably relieve the weight gain of the wear-resistant high vanadium cast iron during oxidation at 950 °C. The mechanism of such oxidation behaviour in the associated cast iron was investigated through adding different Mn contents. During oxidation process, the decrease in weight gain was sensitive to Mn addition, where the smallest weight gain corresponded to an optimal content of 3.0 wt.% Mn. Meanwhile, the degree of macrocracks was closely dependent on Mn contents. Using FIB-TEM site-specific sample preparation technique, an initial Cr2O3 layer with a thickness of 50–200 nm was identified between the matrix cast iron and the post layer of other oxidation products. In addition, Mn additions promoted to refine the precipitating V4C3 particles that uniformly distributed in the matrix cast iron. The relationship between Mn and cracking was then analysed subsequently. Based on oxidation tests and microstructural characterization, the kinetic mechanism of oxidation behaviour of the high-vanadium cast iron at high temperature was then proposed.

中文翻译：

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添加锰对高钒铸铁高温氧化行为的影响

摘要 添加锰 (Mn) 可以显着减轻耐磨高钒铸铁在 950 °C 氧化过程中的增重。通过添加不同的锰含量，研究了相关铸铁中这种氧化行为的机制。在氧化过程中，增重的减少对 Mn 添加敏感，其中最小增重对应于 3.0 wt.% Mn 的最佳含量。同时，宏观裂纹的程度与Mn含量密切相关。使用 FIB-TEM 现场特定样品制备技术，在基体铸铁和其他氧化产物的后层之间确定了厚度为 50-200 nm 的初始 Cr2O3 层。此外，Mn 的添加促进了均匀分布在基体铸铁中的沉淀 V4C3 颗粒的细化。随后分析了Mn与开裂之间的关系。基于氧化试验和显微组织表征，提出了高钒铸铁高温氧化行为的动力学机制。