含夹杂物和疏松缺陷的车轮材料疲劳性能对比研究  

COMPARATIVE STUDY ON FATIGUE PROPERTIES OF WHEEL MATERIALS CONTAINING INCLUSIONS AND SHRINKAGE DEFECTS

作　　者：王朝瀚 徐田[1] 曾东方[1] 鲁连涛[1] WANG ZhaoHan;XU Tian;ZENG DongFang;LU LianTao(State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学轨道交通运载系统全国重点实验室,成都610031

出　　处：《机械强度》2023年第4期820-825,共6页Journal of Mechanical Strength

摘　　要：通过超声波探伤确定缺陷在CL65车轮轮辋中的位置,取出了含有缺陷的毛坯试样,并加工成疲劳试样。在岛津电液伺服疲劳试验机上进行疲劳试验,获得含缺陷试样的疲劳寿命,并分析了缺陷的形状、尺寸与化学成分。结果表明,疏松缺陷的主要成分为MnS,夹杂物缺陷的主要成分为硬质氧化物,含疏松缺陷试样的疲劳寿命高于含夹杂物缺陷试样。结合镶嵌应力理论建立有限元模型,分析了两种缺陷对车轮材料疲劳性能影响的差异。与夹杂物缺陷相比,疏松缺陷和基体界面上的镶嵌应力显著降低,缺陷周围应力集中程度小。因此,含MnS疏松对车轮材料疲劳性能的危害程度明显小于氧化物夹杂。The location of the defect in the CL65 wheel rims was determined by ultrasonic detection,and workblank samples containing the defect were taken out and processed into fatigue samples.Through the fatigue test carried out on Shimadzu electro-hydraulic servo fatigue testing machine,the fatigue life of samples with defects was obtained.After the test,the shape,size and chemical composition of defects were analyzed.The results show that the main component of shrinkage defects is MnS and the main component of inclusion defects is hard oxides.The fatigue life of samples with shrinkage defects is longer than that of samples with inclusion defects.To analyze the difference between the influence of the two defects on the fatigue properties of wheel materials,the finite element models were established based on the tessellated stress theory.Compared with inclusion defects,the tessellated stress at the interface between shrinkage defects and the matrix is significantly reduced and the extent of stress concentration around defects is small.Therefore,the damage of shrinkage defects containing MnS on the fatigue properties of wheel materials is significantly less than that of oxide inclusions.

关 键 词：夹杂物缺陷 疏松缺陷 硫化锰 硬质氧化物 镶嵌应力 

分 类 号：TG142[一般工业技术—材料科学与工程]