湖南大学学报（自然科学版）2017，Vol.44Issue(6)：1-6,6.DOI:10.16339/j.cnki.hdxbzkb.2017.06.001
应力比对WC-Co硬质合金疲劳性能的影响
Influence of Different Stress Ratios on Fatigue Behavior of WC-Co Cemented Carbides
摘要
Abstract
The three-point bending fatigue behaviors of WC-Co cemented carbides with different binder phase content and composition under cyclic loading at two different stress ratios (R=0.1 and R=0.5) were investigated.The characterization of the fracture surfaces was carried out by using a scanning electron microscope (SEM), and the fatigue mechanism was also studied.The results show that the macroscopic fracture morphology exhibited brittle fracture and toughness fracture.With the increase of Co content, the fatigue sensitivity decreased firstly and then increased.Cemented carbides with complex binder phase (Co + Ni + Cr) exhibited lower fatigue sensitivity than that of pure Co cemented carbides.The fracture mechanism transformed from brittle to ductile at the stress ratio changing from 0.1 to 0.5.With the increase of the stress ratio, the fatigue sensitivity was changed.关键词
硬质合金/应力比/疲劳/粘结相Key words
cemented carbides/stress ratio/fatigue/binder phase分类
通用工业技术引用本文复制引用
陈振华,黄瑞明,陈鼎,张忠健,徐涛..应力比对WC-Co硬质合金疲劳性能的影响[J].湖南大学学报（自然科学版）,2017,44(6):1-6,6.基金项目
硬质合金国家重点实验室项目(201403001), the Open Foundation of State Key Laboratory of Cemented Carbide (201403001). （201403001）
