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国家自然科学基金(50471036)

作品数:3 被引量:7H指数:1
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三种渗碳钢中残余奥氏体在冲击磨损中的行为被引量:6
2008年
渗碳钢中合金元素对渗碳过程中材料表面吸碳能力有很大影响,含有较多非碳化物形成元素Si、Mn的22Si2MnCrNi2Mo渗碳层的碳含量最低,只有0.65%;含有较多碳化物形成元素的35CrMoV渗碳层碳含量最高,可达1.05%。三种渗碳钢冲击磨损试验结果表明:冲击磨损速率随着渗碳表层碳含量的增加先降低后增加,在碳含量0.82%时冲击磨损速率出现低谷。冲击磨损过程中残余奥氏体由于应变诱发马氏体相变需消耗外加能量可降低磨损速率,得出磨损速率与相变能之间呈指数关系。
任向红朱金华李永胜陈茹
关键词:渗碳残余奥氏体马氏体
Quasi-nano wear mechanism under repeated impact contact loading被引量:1
2010年
A new quasi-nano wear mechanism (QNWM) has been proposed in this paper based on the facts of wear curve turning under high energy impact contact loading.Its characteristic is that the wear rate of QNWM is only 1/10-1/3 that of delamination mechanism at the same energy density.The diameters of wear debris and pits on the worn surfaces fall into the quasi-nanometer scale (about 50-120 nm).The necessary and sufficient conditions,which bring about the QNWM,are:(i) the nano-structure (nano-crystalline + amorphous phase) in impact contact surface layer has formed by the intensive impact strain;(ii) the delamination wear cracking in sub-surface layer must be restrained;(iii) the microcracks of QNWM are produced in amorphous phase of surface nano-structure layer rather than in nano-crystalline.
ZHU JinHua1,REN XiangHong1,2,ZHANG JianJun1,3,XU YunHua1,3 & LU ZhengXin1,4 1 State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China
关键词:IMPACTWEARWEARMECHANISMWEARMECHANISMNANO-STRUCTURE
Wear mechanisms and hardness thresholds under repeated impact contact loading
2018年
Experiments were performed on 20 different types of materials to analyze the impact contact wear and to establish the wear mechanism map, The wear mechanism has been categorized into three prominent regions (delamination wear, quasi-nano wear and lamination-like wear) and is governed by two hardness thresholds (Hdq and Hql). When the material hardness gcp〈Hdq, the delamination wear is the dominant wear mechanism; when Hcp〉Hql, the mechanism is lamination-like wear; however, whenHco is between Hdq and Hql, the mechanism is determined to be quasi-nano wear. Hdq is determined to be the threshold hardness between delamination wear and quasi-nano wear that reflects the cracks being produced in the subsurface layer, whereas, Hql is termed threshold hardness between quasi-nano wear and lamination-like wear with formation of nanostructure within the surface layer.
REN XiangHongZHU JinHua
关键词:HARDNESS
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