微合金钢S500MC的高频疲劳特性  

HIGH CYCLE FATIGUE PROPERTIES OF MICROALLOYED STEELS S500MC

作　　者：张梅[1] 宁宇翔[1] 李宏涛[1] 万紫 李麟[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海汇众汽车制造有限公司技术中心,上海200122

出　　处：《上海金属》2014年第1期11-13,17,共4页Shanghai Metals

基　　金：上海汽车工业科技发展基金资助(No.1201)

摘　　要：材料的各种静态和疲劳断裂性能是结构强度分析、耐久性和损伤容限设计的基础。微合金高强度钢S500MC由于其较高强度和较高韧性塑性的组合,可广泛用于汽车等领域。采用升降法对S500MC试样进行高频疲劳试验,依据获得的数据绘出其应力-寿命(S-N)曲线,确定应力比R=0.1下的疲劳极限,还获得了一系列高频疲劳特性参数如下:S500MC钢的抗拉强度为635 MPa,疲劳极限σ0.1为471 MPa,达抗拉强度的70%多。双对数坐标系的S-N曲线上,斜线的截距SRI1=1 613 MPa,斜率b=-0.089 33,N C1=2.03×106,相关系数R=-0.954 53。Fatigue failure was the progressive and localized structural damage that occurred when a material was subjected to cyclic loading.Fatigue caused problem for many types of structures,and was the most important failure mode for mechanical components under cyclic loads.The high strength steel S500MC with micro alloy owned the combination of high strength and high plasticity/toughness could be applied to the vehicle structural parts.The high cycle fatigue tests of domestic steels S500MC were carried out.Test results revealed that the fatigue limit （σ0.1） of S500MC was 471MPa,higher than 0.7 of the tensile strength.The fatigue properties of the S500MC were：SRI1 =1 613MPa,b =-0.089 33,NC1 =2.03 × 106,and R =-0.954 53.It follows the relation σ0.1 =1 613-0.089 33lgN.

关 键 词：S500MC钢 微合金钢 高频疲劳 疲劳极限 

分 类 号：TG141[一般工业技术—材料科学与工程]