图5. Ti-38644高锁螺栓的拉伸疲劳断口形貌

Fig.5. Fracture morphology of tension fatigue for Ti-38644 Hi-bolt (a) fatigue fracture of Hi-bolt with extrusion strengthening; (b) fatigue fracture of Hi-bolt without extrusion strengthening; (c) crack source and fatigue striation around the edge of Hi-bolt; (d) dimples at quasi-cleavage fracture; (e) morphology offinal fracture zone