A type of Fe-21.3Cr-3.5Al-0.5Ti-0.4Zr steel was produced for application of spot-welding location pins in automobile industry. The oxidation behavior at temperatures of 1220–1340 °C and wear performance were investigated. The morphologies and constituent phases of the oxide layers were characterized by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The hardness and wear performance of the oxide layers were also measured. The results showed that the mass gain presented a stage characteristic with increasing temperature, i.e., a small increasing at 1220–1260 °C, a moderate increasing at 1280–1300 °C, and a great increasing at 1320–1340 °C. The oxide layer primarily consisted of Al₂O₃ phase and a small amount of ZrO₂ phase. ZrO₂ increased in amount with temperature rising from 1220 to 1340 °C. The oxidized surface exhibited an increase of hardness with increasing temperature, but the lowest wear loss occurred at the oxidation temperature of 1280 °C.

中文翻译：

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Fe-21.3Cr-3.5Al-0.5Ti-0.4Zr钢的表面氧化行为和磨损性能

生产了一种Fe-21.3Cr-3.5Al-0.5Ti-0.4Zr钢，用于汽车工业中的点焊定位销。研究了在1220–1340°C的温度下的氧化行为和磨损性能。通过扫描电子显微镜（SEM）和X射线衍射仪（XRD）表征了氧化物层的形貌和组成相。还测量了氧化物层的硬度和磨损性能。结果表明，随着温度的升高，质量增益呈现出阶段性特征，即在1220–1260°C时有小幅增加，在1280–1300°C时有适度的增长，而在1320–1340°C时有很大的增加。氧化物层主要由Al ₂ O ₃相和少量的ZrO ₂相组成。氧化锆₂随着温度从1220升高到1340°C，数量增加。氧化的表面显示硬度随温度升高而增加，但在1280°C的氧化温度下发生的磨损量最低。