某石油钻井绞车链轮传动轴断裂原因  

Fracture Cause of Chain Wheel Drive Shaft in an Oil Drilling Drawwork

作　　者：樊春明 张增年[3] 王德贵 徐虹 王平怀 FAN Chunming;ZHANG Zengnian;WANG Degui;XU Hong;WANG Pinghuai(National Engineering Research Center for Oil&Gas Drilling Equipment,Baoji 721002,China;CNPC Baoji Oilfield Machinery Co.,Ltd.,Baoji 721002,China;Chuanqing Drilling Engineering Co.,Ltd.,CNPC,Chengdu 610051,China)

机构地区：[1]国家油气钻井装备工程技术研究中心,宝鸡721002 [2]宝鸡石油机械有限责任公司,宝鸡721002 [3]中国石油集团川庆钻探工程有限公司,成都610051

出　　处：《机械工程材料》2021年第1期109-112,118,共5页Materials For Mechanical Engineering

基　　金：“十三五”国家科技重大专项项目(2016ZX05020)。

摘　　要：某石油钻井绞车在运行过程中链轮传动轴突然断裂,通过断口形貌观察、化学成分分析、力学性能测试、显微组织观察等方法,研究了链轮传动轴断裂的原因。结果表明:链轮传动轴的断裂属于早期疲劳失效。裂纹在链轮传动轴ф210mm与ф200mm轴台阶处的粗糙过渡圆角根部应力集中处萌生,在交变弯扭应力作用下扩展,最终导致链轮传动轴的疲劳断裂;组织中存在的片状MnS夹杂物以及心部带状偏析组织促进了疲劳裂纹的扩展。The fracture of chain wheel drive shaft in an oil drilling drawwork during operation ocurred.The reason for fracture of the chain wheel drive shaft was studied by fracture morphology observation,chemical composition analysis,mechanical property test and microstructure observation.The results show that the fracture of chain wheel drive shaft was early fatigue failure.The cracks initiated at the stress concentration of the rough transition fillet root at the step ofф210 mm andф200 mm shafts of the chain wheel drive shaft,and expanded under alternating bending and torsion stresses,leading to the fatigue fracture of the chain wheel drive shaft finally.The existence of lamellar MnS inclusions in the structure and the banded segregation in the core promoted the growth of fatigue cracks.

关 键 词：链轮传动轴 疲劳断裂 应力集中 MnS夹杂物 带状偏析 

分 类 号：TG115[金属学及工艺—物理冶金]