【摘要】：在MMS-2A滾動摩擦磨損試驗機(jī)上進(jìn)行不同材料車輪與U75V熱軋鋼軌的匹配試驗,研究材料特性對輪軌試樣磨損與疲勞性能的影響.結(jié)果表明:隨著車輪碳含量增加,組織中珠光體比例增加,珠光體中滲碳體片層間距減小,硬度增大;隨著輪/軌硬度比增大,車輪表層的塑性變形層厚度逐漸減小,對摩副鋼軌塑性變形層厚度呈現(xiàn)先增大后減小的趨勢;車輪試樣磨損形式由小剝離掉塊向大剝離掉塊轉(zhuǎn)變,鋼軌磨損機(jī)制由材料表層的輕微剝落向深層剝落磨損轉(zhuǎn)變;提升車輪的硬度,輪軌表面的疲勞裂紋長度減小;且隨著車輪硬度的增大,鋼軌表面萌生的疲勞裂紋的末端擴(kuò)展角度有增大的趨勢,使鋼軌的疲勞裂紋更容易向材料心部擴(kuò)展.
[Abstract]:The matching test of wheel of different materials and U75V hot rolled rail was carried out on MMS-2A rolling friction and wear tester, and the influence of material characteristics on wear and fatigue properties of wheel / rail specimen was studied. The results show that with the increase of carbon content in the wheel, the ratio of pearlite in the microstructure increases, the cementite lamellar spacing decreases and the hardness increases. With the increase of wheel / rail hardness ratio, the thickness of plastic deformation layer decreases gradually, and the thickness of plastic deformation layer increases first and then decreases. The wear form of wheel specimen changed from small peeling off block to large peeling off block, the wear mechanism of rail changed from the slight spalling of material surface to deep exfoliation, and the fatigue crack length of wheel / rail surface decreased when the wheel hardness was raised. With the increase of wheel hardness, the end propagation angle of fatigue crack on rail surface is increasing, which makes the fatigue crack of rail propagate to the material center more easily.
【作者單位】： 西南交通大學(xué)牽引動力國家重點實驗室摩擦學(xué)研究所;
【基金】：國家自然科學(xué)基金項目(51475393) 國家重點實驗室自主研究課題(TPL 1301)資助~~
【分類號】：TG115.58

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本文編號：2341475