大尺寸动车组车轮剖面夹杂物原位统计分布表征方法研究与应用

建立了基于扫描电子显微镜和能谱分析相结合的夹杂物原位统计分布分析方法,并对大尺寸D2动车组车轮纵剖面中轮毂、近轮毂辐板、近轮辋辐板、轮辋4个区域内的夹杂物的组成、类型、数量和尺寸进行了原位统计分布解析,探讨了不同区域内的各类夹杂物数量、尺寸和颗粒面积的分布规律,发现车轮中主要典型夹杂物为氧化物、条形硫化物、球形硫化物、...

Research and application of original position statistic distribution characterization method for inclusions in profile of large-size high speed train wheels

The original position statistic distribution analysis method of inclusions based on scanning electron microscope and energy spectrum analysis was established. The original position statistic distribution analysis on composition, type, quantity and size of inclusions in four regions (i.e., the wheel hub, spoke plate near hub, spoke plate near rim and wheel rim) in the wheel longitudinal profile of large-size D-series electric multiple unit (D2 EMU) was conducted. The distribution rules of the quantity, size and particle area of various inclusions in different regions were discussed. It was found that the main typical inclusions in the wheel were oxides, strip-shaped sulfides, spherical sulfides, and oxygen-sulfur complexes. Among them, the quantity of oxides, spherical sulfides, and oxygen-sulfur complex inclusions was most in the rim area, while the quantity of strip-shaped sulfides was most in the spokes near the hub. Total area of oxides, spherical sulfides, and oxygen-sulfur complex inclusions in the hub and rim was generally larger than the web area, but the total area of strip-shaped sulfide inclusions in the rim area was smaller than that in other areas. Meanwhile, the particle size of three types of inclusions (oxides, spherical sulfides, and oxygen-sulfur composites) was mainly concentrated in range of 2-5 μm. The strip-shaped sulfide with size greater than 10 μm accounted for the largest proportion, and the large-size inclusion particles in the rim area accounted for the smallest proportion, which was consistent with the requirements of the wheel preparation process.