摘要
采用滚滑接触疲劳磨损试验机以及光学显微镜、扫描电镜、显微硬度仪等研究了不同轴重下贝氏体车轮钢的滚滑磨损性能及疲劳损伤行为。结果表明:车轮样品的磨损率随着轴重的增加呈增长趋势,30 t时样品的磨损率是20 t的1.36倍。所有样品表面的损伤机制均为疲劳裂纹和黏着磨损。不同轴重下样品表面存在呈梯度分布的塑性变形层。增加轴重,车轮表层材料的变形层厚度和硬化率呈减小趋势,30 t样品的变形层厚度是20 t的0.86倍,而20 t的表面硬化率是30 t的1.04倍。平均裂纹扩展速率、疲劳裂纹扩展角度和深度随着轴重的提高而增大,20 t时样品表面产生A型裂纹,而A型和B型裂纹主要在25和30 t时形成。此外,随着轴重的增加,磨损的增加趋势弱于疲劳,疲劳损伤占据主导地位。
Rolling-sliding wear property and fatigue damage behavior of bainite wheel steel under different axle loads were studied by means of rolling-sliding contact fatigue wear tester,optical microscope,scanning electron microscopy and microhardness tester.The results show that the wear rate of the wheel sample increases with the increase of axle load,and the wear rate of the sample under 30 t axle load is 1.36 times that under 20 t axle load.The damage mechanism of all sample surfaces is fatigue crack and adhesive wear.There are gradient plastic deformation layers on the surface of the samples under different axle loads.With the increase of axle load,the thickness of the deformation layer and the hardening rate of the wheel surface material show a decreasing trend.The thickness of the deformation layer of the 30 t sample is 0.86 times that of the 20 t sample,while the surface hardening rate of the 20 t sample is 1.04 times that of the 30 t sample.The average crack propagation rate,fatigue crack propagation angle and depth increase with the increase of axle load.At the axle load of 20 t,A-type cracks are generated on the sample surface,while A-type and B-type cracks are mainly formed at 25 t and 30 t.In addition,with the increase of axle load,the increasing trend of wear is weaker than fatigue,and fatigue damage is dominant.
作者
马新元
徐海峰
周霆伟
赵海
何宜柱
苏世怀
MA Xin-yuan;XU Hai-feng;ZHOU Ting-wei;ZHAO Hai;HE Yi-zhu;SU Shi-huai(School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243032,China;Ma’anshan Iron&Steel Co Ltd,Ma’anshan 243003,China;The An Hui Society for Metals,Ma’anshan 243000,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2023年第5期135-144,共10页
Transactions of Materials and Heat Treatment
基金
安徽省科技重大专项资助项目(202003a05020038)
国家重点研发计划(2017YFB0305104)。
关键词
重载铁路
轴重
贝氏体车轮
磨损行为
接触疲劳
heavy haul railway
axle load
bainite wheel
wear behavior
contact fatigue
