等温淬火球墨铸铁滚动磨损与损伤性能

发布时间：2018-01-16 11:34

本文关键词：等温淬火球墨铸铁滚动磨损与损伤性能　出处：《材料工程》2015年05期 　论文类型：期刊论文

【摘要】：利用不同热处理方式和球化工艺,获得两种显微组织和不同硬度的等温淬火球墨铸铁(Austempered Ductile Iron,ADI)材料,利用MMS-2A微机控制摩擦磨损试验机对比研究了两种等温淬火球墨铸铁材料、车轮材料与U71Mn钢轨匹配时的滚动磨损与损伤性能。结果表明:ADI材料与U71Mn钢轨匹配时的摩擦因数明显小于车轮材料;由于ADI材料具有自润滑效果导致其磨损率明显小于车轮材料,ADI材料的自润滑性能也降低了对摩副U71Mn钢轨的磨损率,其中含有较大球状石墨和较少残余奥氏体的ADI2材料和对摩副U71Mn钢轨的磨损率最小;ADI材料的磨损机制主要表现为轻微疲劳磨损,对摩副U71Mn钢轨的磨损机制主要表现为黏着和轻微疲劳磨损,而轮轨材料匹配时的塑性流动层显著,损伤以表面疲劳裂纹和剥层损伤为主。
[Abstract]:Two kinds of austempered Ductile Ironi materials with different microstructures and different hardness were obtained by using different heat treatment methods and spheroidizing techniques. Two isothermal quenched ductile iron materials were studied by MMS-2A microcomputer controlled friction and wear tester. The rolling wear and damage properties of the wheel material and U71Mn rail are compared. The results show that the friction coefficient of the Wheel material matching with the U71Mn rail is obviously smaller than that of the wheel material. The wear rate of ADI material is obviously lower than that of wheel material and the wear rate of U71Mn rail is decreased because of its self-lubricating effect. The wear rate of U71Mn rail and ADI2 material containing larger spherical graphite and less retained austenite is the least. The wear mechanism of ADI material is mainly slight fatigue wear, the wear mechanism of U71Mn rail is adhesive and slight fatigue wear, and the plastic flow layer of wheel / rail material matching is obvious. The main damage is surface fatigue crack and delamination damage.
【作者单位】：西南交通大学牵引动力国家重点实验室摩擦学研究所;
【基金】：国家自然科学基金资助项目(51174282,U1134202) 国家重点实验室自主研究课题(TPL1301)
【分类号】：TG143.5;TG164.2
【正文快照】： FU Zhi-kai,WANG Wen-jian,DING Hao-hao,GU Kai-kai,LIU Qi-yue(Institute of Tribology,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China)等温淬火球墨铸铁(Austempered Ductile Iron,ADI)是一种新兴的具有广阔应用前景的材料

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