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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Microstructure of the worn surfaces of a bainitic steel railway crossing
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Microstructure of the worn surfaces of a bainitic steel railway crossing

机译：贝氏体钢铁路道口磨损面的微观结构

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摘要

The microstructure in the worn surfaces of a failed bainitic steel railway crossing was investigated using optical microscopy, SEM, TEM, nanoindentation and Mossbauer spectroscopy. The results indicated that a nanocrystalline layer had formed in the surface of a worn crossing during service. The formation of the nanocrystalline layer was due to the severe plastic deformation (SPD) caused by the repeated heavy loading in service by high speed train wheels. The mechanism of formation of the nanocrystalline layer was strain induced dynamic recrystallization, and the nanocrystalline grains were nucleated from the original crystals of the steel directly. The alloying elements in the worn surfaces of the steel segregated slightly by diffusion during the process of recrystallization. The nanocrystalline layer does not display the white etching layer commonly observed in ordinary railway rails, the reason may be the differences of its microstructure and carbon content with the ordinary rail steel.
机译：使用光学显微镜，SEM，TEM，纳米压痕和Mossbauer光谱研究了贝氏体失效的贝氏体钢铁路道口的磨损表面的微观结构。结果表明，在使用过程中在磨损的交叉口的表面形成了纳米晶体层。纳米晶体层的形成是由于高速火车轮在使用中反复承受重负荷而导致的严重塑性变形（SPD）。纳米晶层的形成机理是应变诱导的动态再结晶，纳米晶晶粒直接从钢的原始晶体中形核。在再结晶过程中，钢的磨损表面中的合金元素由于扩散而略微偏析。纳米晶层不显示在普通铁路轨中通常观察到的白色蚀刻层，其原因可能是其微观结构和碳含量与普通铁路钢不同。

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