中国铁道科学2013，Vol.34Issue(4)：71-76,6.DOI:10.3969/j.issn.1001-4632.2013.04.12
45#车轴钢疲劳性能试验研究
Experimental Study on the Fatigue Properties of 45# Axle Steel
摘要
Abstract
In the non-metallic inclusion inspection and tensile test at room temperature,the metallurgy quality and mechanical properties of materials were checked whether they were up to standards.And then the fatigue properties of 45# axle steel were studied by rotary bending fatigue testing method and fracture analysis.The results show that,compared with smooth specimen,the fatigue limit of notched specimens with the notch depth of 0.75 mm is decreased 44％,and the left slope of its S—N curve is greater than that of the smooth.The sensitive coefficient of notched specimen is 0.79.Moreover,the initiation of fatigue cracks in the smooth specimen is due to the stress concentration on the surface of specimen.There are multi-source areas of fatigue on the cross sections of the notched specimens and the cracks initiate at the lip of the notch,which is mainly caused by the stress concentration at the notch.In addition,larger size non-metallic inclusions may also lead to the initiation of fatigue cracks in axle steel.关键词
车轴钢/性能试验/疲劳极限/S—N曲线/断口分析Key words
Axle steel/ Performance test/ Fatigue limit/ S—N curve/ Fracture analysis分类
交通工程引用本文复制引用
黄国,黄海明,王超,李玮洁..45#车轴钢疲劳性能试验研究[J].中国铁道科学,2013,34(4):71-76,6.基金项目
国家自然科学基金资助项目(11272042) （11272042）
