席艳君,李宪哲,董澍,吴永乐.磨损对U71Mn材料表面高温氧化行为的影响[J].表面技术,2021,50(5):289-294.
XI Yan-jun,LI Xian-zhe,DONG Shu,WU Yong-le.Effect of Wear on Oxidation Behavior of U71Mn at High Temperature[J].Surface Technology,2021,50(5):289-294 |
| 磨损对U71Mn材料表面高温氧化行为的影响 |
| Effect of Wear on Oxidation Behavior of U71Mn at High Temperature |
| 投稿时间：2020-05-17 修订日期：2020-07-23 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.05.032 |
| 中文关键词: U71Mn 高铁钢轨 高温 氧化 磨损 氧化膜 |
| 英文关键词:U71Mn high-speed rail high temperature oxidation wear oxide film |
| 基金项目:河南省科技厅自然科学基金项目(182300410231);中国纺织工业联合会项目(2018131) |
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| 中文摘要: |
| 目的 研究U71Mn钢轨材料磨损后的高温氧化行为，探讨高温和磨损对钢轨表面损伤的影响机制。方法 用磨损试验机对材料进行磨损试验，将磨损不同程度的材料在加热炉中进行氧化实验，用带能谱的扫描电镜对材料界面进行表征，用XRD对氧化物相进行分析，研究磨损对U71Mn钢轨材料表面高温氧化性能的影响。结果 磨损量随载荷增加而变大。在800、900 ℃保温5 h后，未磨损材料比磨损材料质量增加明显。这是因为磨损材料表面产生划痕裂纹，空气中的氧在裂纹尖端快速吸附，扩散到裂纹尖端的基体中，生成氧化物，降低了裂纹前沿原子键结合能，造成材料表面大面积脱落。在900 ℃，未磨损U71Mn材料高温加热后，表面氧化膜主要为Fe2O3，500 N磨损材料高温氧化膜主要成分为FeO和Fe3O4相，1000 N磨损材料氧化膜主要成分为Fe2O3和Fe3O4相。结论 未磨损U71Mn钢轨材料的耐高温氧化性能明显优于磨损材料。磨损会加速材料高温损伤，且具有一定的方向性。轮轨摩擦划痕严重影响高温氧化膜的相结构和附着力，从而影响钢轨的使用寿命。 |
| 英文摘要: |
| The high temperature oxidation behavior of U71Mn rail material after wear was studied, and the influence mechanism of high temperature and wear on rail surface damage was discussed. The wear test of materials was carried out with a wear tester, and the oxidation tests were carried out in a heating furnace. The interface of materials was characterized by SEM with energy spectrum, and the phases of oxides were analyzed by XRD. The effect of wear on the surface oxidation properties of U71Mn rail material at high temperature was investigated. The results showed that the amount of wear increases with the increase of load. The weight of the material without wear was obviously increased compared with that of the worn material at 800 ℃ and 900 ℃ for 5 hours. This is because there were scratch cracks on the surface of the material after wear. Oxygen in the air rapidly was adsorbed at the crack tip, diffused into the matrix at the crack tip, and formed oxides, thus reducing the atomic bond energy at the crack front, causing a large area of material surface falling off seriously. This shows that the scratch caused by wheel-rail friction has a great effect on the high-temperature properties of rail materials. The oxide film on the surface of unworn U71Mn was mainly Fe2O3 at 900 ℃ for 5 hours. The oxide film on the surface of material after 500 N wear contained FeO and Fe3O4, while the oxide film on the surface of material after 1000 N wear contained Fe2O3 and Fe3O4 at 900 ℃. The macro-defects on the surface of the material caused by scratch was the oxidation active region, and stable Fe3O4 was formed in a very short time, but the oxidation film grows quickly and unsteadily on the scratch, and part of Fe3O4 falls off, then the exposed part of the substrate was oxidized again to form FeO. The high temperature oxidation resistance of unworn U71Mn rail material is obviously better than that of worn material. Wear can accelerate the material damage at high temperature, and has a certain direction. The scratch of wheel-rail friction seriously affects the phase structure and adhesion of oxide film at high temperature, and thus affects the service life of rail. |
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