Abstract In this present work, the dry sliding wear behavior of novel continuously cooled ultrafine carbide free bainitic (CFB) steel has been studied against EN31 steel using a pin-on-disc tribometer. The effects of changing the load on wear rate, the topography of the worn surface and microstructure near the worn surface have been studied. It was found that this novel CFB steel has excellent wear resistance properties, as could be seen from the calculated specific wear rates (mm3 × m-1 × N-1). Such a property might have been due to very good work hardening behaviour originating because of the evolution and accumulation of lattice defects like the generation of high dislocation density as well as due to the transformation of meta-stable retained austenite into martensite under deformation. Wear samples were characterized by many techniques which include scanning electron and atomic force microscopy, profilometer, X-ray diffraction (XRD) and micro-hardness measurements. Calculations of the XRD profiles showed an increase in dislocation density up to 127%. Around 33% increase in hardness on the worn surface of samples for 50 N normal load were measured. It could also be observed that the wear mechanism has been changed as well from lower to higher load conditions.

中文翻译：

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滑动磨损过程中新型连续冷却无碳化物贝氏体钢的显微组织演变

摘要 在目前的工作中，使用销盘式摩擦计研究了新型连续冷却超细碳化物游离贝氏体 (CFB) 钢与 EN31 钢的干滑动磨损行为。研究了改变载荷对磨损率、磨损表面形貌和磨损表面附近微观结构的影响。从计算的比磨损率 (mm3 × m-1 × N-1) 可以看出，这种新型 CFB 钢具有优异的耐磨性能。这种特性可能是由于晶格缺陷的演化和积累（如高位错密度的产生）以及亚稳残余奥氏体在变形下转变为马氏体而产生的非常好的加工硬化行为。磨损样品通过多种技术进行表征，包括扫描电子和原子力显微镜、轮廓仪、X 射线衍射 (XRD) 和显微硬度测量。XRD 谱的计算表明位错密度增加了 127%。测得样品在 50 N 法向载荷下磨损表面的硬度增加了约 33%。还可以观察到磨损机制也已从较低负载条件更改为较高负载条件。