PD3和U71Mn钢轨钢的弯-弯疲劳裂纹扩展特性
Bend-Bend Fatigue Crack Propagation Characteristics of PD3 and U71Mn Rail Steels
摘 要
在NENE-2型微动疲劳试验机上对弯-弯条件下PD3、U71Mn钢的疲劳裂纹扩展特性进行了研究.结果表明:相同弯-弯条件下,U71Mn钢中的疲劳裂纹较PD3钢中的短,因而具有较好的抗疲劳性能;其原因在于U71Mn钢的塑性较PD3钢的好,使得裂纹尖端钝化,同时其细小的珠光体具有更多的晶界,从而为能量的耗散提供了更多的途径,最终使得裂纹在U71Mn钢中较在PD3钢中不容易扩展.
疲劳裂纹扩展
弯-弯疲劳
rail steel
fatigue crack propagation
bend-bend fatigue
Abstract
The fatigue crack propagation characteristics of PD3 and U71Mn rail steels under bend-bend condition were investigated using NENE-2 fretting fatigue test machine.The results indicate that under the same bend-bend condition the fatigue crack was shorter in U71Mn steel than in PD3 steel,so the former had better fatigue resistance than the latter.One reason was that the excellent plasticity of U71Mn made crack tip passivated.An other rcason was that the refined pearlite with more grain boundaries provided more ways to dissipate energy.Because of above reasons,crack propagation in U71Mn rail steel was more difficult than in PD3 rail steel.
中图分类号 TH117.3
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50675183);国家重点基础研究发展“973”计划资助项目(2007CB714702);西南交通大学创新团队培育计划资助资助(2007IRT01)
收稿日期 2009/3/20
修改稿日期 2010/1/27
网络出版日期
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备注胡家杰(1980-),男,四川成都人,硕士研究生.
引用该论文: HU Jia-jie,ZHONG Wen,LIU Qi-yue. Bend-Bend Fatigue Crack Propagation Characteristics of PD3 and U71Mn Rail Steels[J]. Materials for mechancial engineering, 2010, 34(4): 58～61
胡家杰,钟雯,刘启跃. PD3和U71Mn钢轨钢的弯-弯疲劳裂纹扩展特性[J]. 机械工程材料, 2010, 34(4): 58～61
被引情况:
【1】刘亮,王文健,郭俊,刘启跃, "钢轨踏面斜裂纹扩展寿命的预测",机械工程材料 36, 26-30(2012)
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