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Study on the surface microstructure evolution and wear property of bainitic rail steel under dry sliding wear
Wear ( IF 5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.wear.2020.203217
Yuda Chen , Ruiming Ren , Xiujuan Zhao , Chunhuan Chen , Rui Pan

Abstract As the industry of railway transportation is thriving, much more attention has been paid to the properties of wheel/rail steel materials. Although conventional wheel/rail steel materials have proved their competence so far, it is necessary to think ahead and develop new wheel/rail steel materials in order to meet new challenges raised by railway transportation in the future. Since bainitic steel is the first choice for the new wheel/rail steel material, it is especially important to fundamentally investigate its wear property. Through the sliding wear experiment on AB1 bainitic rail steel, the microstructural evolution of bainitic steel during the wear process and the factors that affected its wear property were probed into in this paper. Under sliding wear, it was discovered that ploughing wear, adhesion wear and flake-like peeling were the primary morphological characteristics of AB1 bainitic rail on the worn surface, and the flakes generated by peeling were relatively thin; WELs appeared on the worn surface of AB1 bainitic rail steel, with the thickness of less than 20μm. The main microstructure inside the WELs contained nanoscale bainitic ferrite grains and martensite grains. Under the impact of stress, the surface microstructure of AB1 bainitic rail steel underwent the following changes: the direction of bainitic ferrite laths gradually became perpendicular to that of the stress, and with the increase of the deformation strain and strain rate, bainitic ferrite laths were segmented into numerous short bar-shaped subgrains and even into nanoscale equiaxed grains with random orientations; residual austenite, no longer stable, underwent martensite transformation, and after the formation of martensite, under the influence of pressure stress, martensite lath grains were multidirectionally segmented into pieces that formed nanoscale martensite grains. Residual austenite inside the microstructure of AB1 bainitic rail steel, the thickness of bainitic ferrite laths and the WELs formed during the wear process would all affect the wear property of bainitic steel.

中文翻译:

干滑动磨损下贝氏体钢轨表面组织演变及磨损性能研究

摘要 随着铁路运输业的蓬勃发展,轮轨钢材的性能越来越受到重视。虽然目前传统轮轨钢材已经证明了其能力,但未来仍需提前思考,开发新型轮轨钢材,以应对铁路运输带来的新挑战。由于贝氏体钢是新型轮轨钢材料的首选,从根本上研究其耐磨性能就显得尤为重要。本文通过AB1贝氏体钢轨滑动磨损试验,探讨了贝氏体钢在磨损过程中的显微组织演变及影响其磨损性能的因素。在滑动磨损下,发现耕作磨损,AB1贝氏体钢轨在磨损表面的主要形态特征是粘附磨损和片状剥落,剥落产生的剥落相对较薄;WELs出现在AB1贝氏体轨道钢的磨损表面,厚度小于20μm。WEL 内部的主要微观结构包含纳米级贝氏体铁素体晶粒和马氏体晶粒。在应力作用下,AB1贝氏体轨道钢的表面组织发生了如下变化:贝氏体铁素体板条方向逐渐与应力方向垂直,随着变形应变和应变速率的增加,贝氏体铁素体板条方向逐渐变为垂直方向。被分割成无数条短棒状亚晶,甚至成具有随机取向的纳米级等轴晶;残余奥氏体,不再稳定,发生马氏体转变,马氏体形成后,在压力应力的作用下,马氏体板条晶粒多向分割成纳米级马氏体晶粒。AB1贝氏体导轨钢微观组织内部的残余奥氏体、贝氏体铁素体板条的厚度和磨损过程中形成的WEL都会影响贝氏体钢的磨损性能。
更新日期:2020-05-01
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