摘要
对利用驰豫-析出-控制相变(TMCP+RPC工艺)技术获得的800MPa级超细晶粒低合金高强度钢的低周疲劳性能进行了测试,并对其循环特性和疲劳断口进行了观察和分析,发现该材料为循环软化,而且随着应变幅的提高,材料的软化速率逐渐增大.对材料的疲劳断口观察表明,疲劳裂纹起始于试样表面,沿断口周边分布,呈多源性特征.
The low-cycle fatigue test of 800 MPa-grade ultrafine-grained HSLA was done. The result showed that the low-cycle fatigue cycle characteristic of the material is cyclic softening under the experimental condition and the softening velocity increases with the increasing of strain amplitude. Observations of the fatigue fractography revealed that fatigue cracks start from the material surface and distribute along the fracture border, which have multi-fatigue origins.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2005年第1期75-78,共4页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(No.50334010)
关键词
低合金高强度钢
低周疲劳
循环特性
超细晶粒钢
Crack initiation
Crack propagation
Fatigue of materials
Fatigue testing
Fractography
Fracture
Strain
