The microstructure, surface fracture morphology, hardness and tensile strength of the failed 45 steel connectingbolt were analyzed and tested.
对45钢连接螺栓断裂件的显微组织、断口形貌、硬度和抗拉强度进行了观察分析和测试。
2
2 bolt force in poor condition, and the basic chassis connectingbolt section with larger diameter and base section of standard section and connectingbolt diameter smaller.
螺栓受力状况不良，底架与基础节连接的螺栓直径较大，而基础节与标准节连接的螺栓直径较小。
3
The existence of reticulation and mass shape ferrite, decarbonization at the screw thread surface layer which induced decline of fatigue strength of connectingbolt were also…