16MnR钢的高应变超低周疲劳性能  

High strain extremely low cycle fatigue properties of 16MnR steel

作　　者：曾涛[1,2] 陈延强[1] 罗云蓉[1,2] 林海波[1,2] 

机构地区：[1]四川理工学院机械工程学院,四川自贡643000 [2]四川理工学院过程装备与控制工程四川省高校重点实验室,四川自贡643000

出　　处：《钢铁研究学报》2016年第4期53-57,共5页Journal of Iron and Steel Research

基　　金：材料腐蚀与防护四川省重点实验室基金资助项目(2012CL10;2013CL07);过程装备与控制工程四川省高校重点实验室基金资助项目(GK201205)

摘　　要：从压力容器的实际工况和抗震安全性设计出发,研究了压力容器用钢16MnR钢的高应变超低周疲劳性能。采用横向应变控制方法,在MTS809拉扭复合疲劳试验机上测定了试验钢应变疲劳过程中的循环应力响应特征及循环应力与应变的关系等超低周疲劳行为;通过拟合Basquin公式和Coffin-Manson公式,获得了试验钢的高应变超低周疲劳寿命预测公式。断口扫描发现,超低周疲劳下,多处裂纹萌生于试件表面,然后裂纹共同向内扩展,直到最后快速断裂。High strain extremely low cycle fatigue（ELCF）properties of pressure vessel steel 16 MnR were studied according to the actual working conditions and anti-seismic safety design of pressure vessel.The fatigue tests were conducted under uniaxial tension-compression loading with total strain control.on MTS 809servo-hydraulic material testing machine.The ELCF behaviors,such as cyclic stress response characteristics and relationship between cyclic stress and strain were investigated.The strain-life data from the axial tests were used to derive suitable Coffin-Manson parameters for the test material.The micrographs of scanning electron microscope（SEM）reveal that several cracks initiate at the surface of the specimen,which results in multiple fatigue sites in ELCF.Then the cracks propagate inward together till ultimate fracture.

关 键 词：16MNR钢 超低周疲劳 疲劳寿命 微观断裂机理 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TH49[金属学及工艺—金属材料]