The existence of reticulation and mass shape ferrite,decarbonization at the screw thread surface layer which induced decline of fatigue strength of connecting bolt were also...

• 此外,显微组织中网状、块状铁素体的存在以及螺纹表层脱碳使连接螺栓疲劳强度下降也是造成断裂的重要原因。