摘要
采用纳米压痕划痕仪与AFM,研究PD3与U71Mn钢轨微观力学性能与摩擦磨损特性,通过拉伸实验和JD-1轮轨模拟试验机研究2种钢轨的宏观力学特性与摩擦磨损性能。结果表明:2种材料力学性能在微观和宏观表现一致,即PD3钢轨硬度较大、抗压能力强,具有良好的抗磨损能力;U71Mn钢轨塑性高、韧性大,具有良好的抵抗疲劳的能力。微观实验结果显示,2种钢轨在载荷不大时都以磨粒磨损为主,随载荷增大,交变应力作用增强,受疲劳影响PD3钢轨划痕两侧出现沟纹;U71Mn划痕损伤在犁沟摩擦力作用下,产生塑性变形。微观与宏观实验结果具有一致性,对2种钢轨磨损特性的测量误差在5%之内,因此在一定程度上可以用微观实验来代替宏观实验研究钢轨材料的摩擦磨损特性。
The micro mechanical properties and wear characteristics of PD3 and U71 Mn rail materials were studied using nanoindenter and AFM,and the macro mechanical properties and wear performance were investigated by static tension tests and simulation experiments. The results indicate that the micro and macro mechanical properties of two kinds of materials are consistent,it is that PD3 rail has bigger hardness,stronger compression capability,better resistance to wear,while U71 Mn rail has higher plasticity,better resistance to fatigue. Micro test results show that the abrasive wear is the main wear mechanism while the load is smaller,and with the increase of load,the alternating stress is increased,ditch lines appear at both sides of PD3 rail nick in the effect of fatigue,seriously plastic deformation is produced for U71 Mn under the furrow friction function. Micro and macro experimental results are consistent,the measurement error is within 5%,so in some extent,micro experiments can substitute macro experiment to analyze the friction and wear characteristics of rail materials.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第11期36-41,共6页
Lubrication Engineering
基金
国家自然科学基金项目(51174282)
教育部创新团队科学基金项目(IRT1178)
关键词
钢轨
微观性能
宏观性能
摩擦磨损
rail
micro properties
macro properties
friction and wear
