带式输送机减速机高速轴断裂失效分析  

Cracking failure analysis on a high speed shaft of belt conveyor reducer

作　　者：谭晓蒙 田峰[1] 乔欣 郭心爱[1] Tan Xiaomeng;Tian Feng;Qiao Xin;Guo Xin’ai(Inner Mongolia Electric Power Science&Research Institute,Hohhot Inner Mongolia 010020,China)

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020

出　　处：《金属热处理》2021年第6期253-256,共4页Heat Treatment of Metals

基　　金：2020年内蒙古电力科学研究院科技项目(2020-ZC-04)。

摘　　要：某输煤系统带式输送机减速机的18CrNiMo7-6钢制高速轴发生早期断裂。为此对失效轴进行宏观分析、断口扫描电镜及能谱分析、金相分析、硬度分析、冲击韧性分析和化学成分分析。结果表明,该失效轴断裂性质为多源疲劳断裂,疲劳源位于键槽尖端,高速轴未经正确的表面强化热处理是导致其发生早期断裂的重要原因。Early fracture of the 18CrNiMo7-6 steel high speed shaft of belt conveyor reducer in a coal conveying system occurred,thus the failure analysis were carried out by using macroscopic,metallographic,chemical composition,SEM,and EDS analyses,as well as hardness and impact tests.The results show that the shaft fracture is of multi-source fatigue type,the fatigue source is located at the tip of key slot,and the early fracture of high-speed shaft is caused by without of proper surface strengthening heat treatment.

关 键 词：带式输送机减速机 高速轴 18CrNiMo7-6钢 疲劳断裂 表面热处理 

分 类 号：TG156.3[金属学及工艺—热处理]