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火车车轮轮辋组织与显微硬度的统计分布表征 被引量:4

Statistical distribution characterization of train wheel rim structure and microhardness
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摘要 采用高通量场发射扫描电镜结合图像批处理技术以及全自动显微维氏硬度分析技术对2种不同成分(W1和W2)的火车车轮轮辋踏面附近较大范围内的显微组织和硬度进行了原位统计分布表征,探究了轮辋靠近踏面的关键区域铁素体面积分数和珠光体片层间距的分布规律。通过大尺度原位统计分布表征结果可以发现,2种车轮铁素体面积分数自踏面往里均呈现逐渐增加的趋势,但固溶强化元素Si和沉淀强化元素V的含量差异以及W2车轮所采用更为精细的阶梯式淬火工艺对车轮的微观组织和硬度的定量分布有较大影响。固溶强化和沉淀强化元素含量较少的W1车轮的铁素体面积分数较小且分布梯度较大,同时由于其较快的冷却速率,其显微维氏硬度分布也存在较大波动。珠光体片层间距的分布趋势与铁素体面积分数的趋势相似,而W2车轮的增长趋势相对较缓,相应的硬度变化梯度较小。 High-throughput field emission scanning electron microscopy combined with image batch processing technology and fully automatic micro Vickers hardness analysis technology were used to analyze the microstructure and hardness of two different components(W1 and W2) near the rim tread of the train wheel.The original position statistical distribution characterization was carried out,and the distribution law of the ferrite area fraction and the pearlite interlamella spacing in the key area of the rim near the tread was explored.Through the large-scale original position statistical distribution characterization results,it can be found that the ferrite area fraction of the two types of wheels gradually increases from the tread inward,but the difference in the content of the solid solution strengthening element Si and the precipitation strengthening element V and the more refined stepped quenching process used in W2 wheels have a greater impact on the quantitative distribution of the microstructure and hardness of the wheel.The W1 wheel with less solid solution strengthening and precipitation strengthening elements has a smaller ferrite area fraction and a larger distribution gradient.At the same time,due to its faster cooling rate,its micro-Vickers hardness distribution also has larger fluctuations.The distribution trend of pearlite lamellar spacing is similar to that of ferrite area fraction,while the growth trend of W2 wheels is relatively slow,and the corresponding hardness change gradient is small.
作者 冯浩洲 王蓬 李冬玲 王海舟 FENG Haozhou;WANG Peng;LI Dongling;WANG Haizhou(China Iron and Steel Research Institute Group,Beijing 100081,China;NCS Testing Technology Co.,Ltd.,Beijing 100081,China;Beijing Key Laboratory of Metallic Material Characterization,Beijing 100081,China)
出处 《钢铁研究学报》 CAS CSCD 北大核心 2022年第3期280-287,共8页 Journal of Iron and Steel Research
基金 国家重点研发计划资助项目(2017YFB0702102)。
关键词 火车车轮 显微组织 片层间距 硬度 分布 train wheel microstructure interlamellar spacing hardness distribution
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