16Mn结构钢超高周疲劳性能研究  

Fatigue Life in very High Cycle Range of 16Mn Structure Steel

作　　者：张真源[1] 王弘[1] 

机构地区：[1]西南交通大学应用力学与工程系,四川成都610031

出　　处：《中国材料科技与设备》2007年第6期87-89,共3页Chinese Materials Science Technology & Equipment

基　　金：西南交通大学科学发展基金项目（2005A10）

摘　　要：采用超声疲劳试验技术对16Mn结构钢超高周疲劳性能进行了研究，并用扫描电镜对疲劳断口进行了分析。结果显示16Mn结构钢在10^5-10^10周次范围内的S—N曲线呈阶梯型下降趋势，在10^6-10^8周次出现平台，平台对应应力幅约为220MPa．在平台应力以下，10^8周次以上超高周范围16Mn结构钢仍然发生疲劳断裂，不存在传统意义的疲劳极限。16Mn结构钢疲劳断口分析结果表明高周和超高周断裂试样的裂纹源主要从试件表面和次表面缺陷处萌生。10^7周次下超高周疲劳试样强度比常规试样疲劳强度低。Fatigue behavior of 16Mn Structure steel was studied with the ultrasonic fatigue testing, and with Scanning electron examine the fatigue crack fracture surface . The curve of 16Mn Structure steel assumed the stepwise shape, platform appears in 10^6-10^8 cycles. The result of The experiment indicated stress of platform was about 220 MPa. 16Mn Structure steel ocured fatigue break above 10^8 cycles and below stress platform and was no exit tradition significance fatigue limit, most of the fatigue crack initiated from the surface of specimen according to analysing fatigue fracture surface and flaws of second surface. 10^7 cycles under vevy high cycle fatigue strength of the sample specimen fatigue strength than conventional low.

关 键 词：超高周疲劳 S-N曲线 16Mn结构钢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]