Effect of Turning Process on Fatigue Behavior of EA4T Axle Steel
摘 要
对不同工艺车削加工的EA4T车轴钢进行旋转弯曲疲劳试验,研究了车削加工工艺对该钢疲劳性能的影响。结果表明:在不同车削加工工艺下,试验钢轴向残余压应力的最大值与最小值相差50 MPa,周向残余拉应力的最大值与最小值相差25 MPa,车削加工工艺对残余应力的影响不大;不同车削加工工艺下试验钢表面粗糙度均小于0.8 μm,且表面粗糙度的最大值与最小值相差0.15 μm,车削加工工艺对表面粗糙度的影响不大;当表面粗糙度小于0.8 μm时,车削加工工艺对疲劳寿命的影响不大;疲劳断口均分为裂纹源区、裂纹稳态扩展区和瞬断区,且均只有一个裂纹源,疲劳裂纹都是在表面较深车痕的根部萌生并向内扩展。
Abstract
The rotary bending tests of EA4T axle steel machined with different turning processes were conducted, and the effect of turning process on fatigue behavior of the EA4T axle steel was studied. The results show that the difference between the maximum and minimum residual compressive stresses of the tested steel was 50 MPa and that of the residual tensile stresses was 25 MPa under different turning processes. The turning process had little influence on the residual stress. The surface roughness of the tested steel under different turning processes was less than 0.8 μm and the difference between the maximum and minimum surface roughness was 0.15 μm. The turning process had little effect on the surface roughness. When the surface roughness was less than 0.8 μm, the impact of the turning process on the fatigue life was limited. The fatigue fracture consisted of crack source region, crack stable expansion region and transient region, and only one crack source existed. The fatigue cracks were generated in the root of the deep turning marks and extended to the inside of the tested steel.
中图分类号 TG178 DOI 10.11973/jxgccl201804014
所属栏目 材料性能及应用
基金项目
收稿日期 2017/2/13
修改稿日期 2018/2/6
网络出版日期
作者单位点击查看
备注孙奇(1992-),男,辽宁鞍山人,硕士研究生
引用该论文: XU Feng,SUN Qi,LIU Pengtao,ZHAO Xiujuan,CHEN Chunhuan,REN Ruiming. Effect of Turning Process on Fatigue Behavior of EA4T Axle Steel[J]. Materials for mechancial engineering, 2018, 42(4): 62~67
徐锋,孙奇,刘鹏涛,赵秀娟,陈春焕,任瑞铭. 车削加工工艺对EA4T车轴钢疲劳性能的影响[J]. 机械工程材料, 2018, 42(4): 62~67
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参考文献
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【3】石塚弘道,唐作华.车轴轻量化途径[J].国外铁道车辆,1992(1):35-39.
【4】孙蕾,陈蕾.铁路货车RD2型车轴轴颈卸荷槽质量问题研究与对策[J]. 铁道车辆,2006,44(5):11-17.
【5】李炳华,杜欣.高速机车车辆车轴的疲劳设计[J].内燃机车, 2000(1):14-20.
【6】米彩盈, 李芾.高速动力车车轮强度分析的工程方法[J].轨道机车与动车, 2000,9(1):14-20.
【7】周平宇.高速动车组车轴材料及疲劳设计方法[J].铁道车辆,2009,47(2):29-31.
【8】黄国,黄海明,王超,等.45#车轴钢疲劳性能试验研究[J].中国铁道科学,2013,34(4):71-76.
【9】张大鹏,陈光雄,田合强.车轴轮座微动损伤对车轴疲劳寿命的影响[J].机械设计与制造,2009(1):113-115.
【10】徐延海,赵永翔.LZ50车轴钢疲劳短裂纹萌生的数值模拟[J].应用力学学报,2009,26(3):589-593.
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