| 摘要: |
| 为解决变轨距高速列车转向架轮轴花键配合面承受动载时的冲击磨损问题,对 DZ2 车轴钢进行离子渗氮强化处理。 采用一系列宏/ 微观方法表征离子渗氮表层相结构、表面形貌、显微组织及硬度梯度,并对渗氮层及调质态基体的冲击磨损动力学响应及损伤行为进行研究。 结果表明:两类状态的试样抗冲击磨损性能差异显著,在相同冲击动能下,离子渗氮层的能量吸收率低于调质态材料,DZ2 车轴钢离子渗氮后比原始调质态具有更好的耐冲击磨损性能。 DZ2 调质态材料以剥层磨损为主,接触区域摩擦氧化显著;离子渗氮表面损伤轻微,仅局部材料磨损剥落,摩擦氧化现象不明显。 随冲击周次的提高,调质态材料磨损损伤加剧,损伤区域出现大量表面微裂纹和氧化磨屑堆积,而经离子渗氮处理材料损伤较轻微,冲击磨损表面未观察到裂纹萌生。 离子渗氮工艺能有效增强变轨距车轴的抗冲击磨损性能。 |
| 关键词: DZ2 车轴钢 离子渗氮 冲击磨损 动力学响应 能量吸收率 |
| DOI：10.11933/j.issn.1007-9289.20210405001 |
| 分类号:TH117.1 |
| 基金项目:国家自然科学基金资助项目(51627806) |
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| Impact Wear Evolution Behavior of Plasma Nitriding Layer of DZ2 Axle Steel |
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REN Yanping1, HE Jifan1, CAI Zhenbing1, PENG Jinfang2, LI Zhongwen3, LU Jinsheng4, ZHU Minhao1
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1.Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031 , China;2.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031 , China;3.CRRC Qingdao Sifang Locomotive and Rolling Stock Co.Ltd, Qingdao 266111 , China;4.Zhengzhou Research Institute of Mechanical Engineering Co.Ltd, Zhengzhou 450052 , China
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| Abstract: |
| Aiming at studying the impact wear issue of spline axles of gauge-changeable railway vehicles when subjected to dynamic loading, plasma nitriding was employed on DZ2 axle steel. The phase, surface morphology, microstructure, and microhardness of the nitrided specimens were characterized by a series of macro and micro methods, and the impact dynamic response and impact wear behavior were investigated. Results show that there were significant differences in impact wear resistance for DZ2 substrate and nitrided specimens: under the same impact energy, the energy absorption ratio of nitrided specimens was lower than that of the substrate, and nitrided specimens exhibited better impact wear resistance. DZ2 substrate was given priority to peeling wear and oxidation behavior in the wear scars, while little material delamination and oxidation was limited for nitrided specimens. With increasing impact cycles, the wear of the substrate was aggravated, and a large number of micro-cracks and oxidation debris accumulation occurred, while damage of the plasma-nitrided specimens was still slight and no cracks occurred in the wear scars. Plasma nitriding was suitable for the surface modification of a DZ2 gauge-changeable axle. |
| Key words: DZ2 axle steel plasma nitriding impact wear dynamic response energy absorption ratio |
