山东科学2017，Vol.30Issue(6)：41-44,4.DOI:10.3976/j.issn.1002-4026.2017.06.007
球墨铸铁QT500-7空压机轴异常断裂失效分析
Failure analysis for abnormal fracture of nodular cast iron QT500-7 air compressor shaft
修大鹏 1张素卿 1周吉学 1杨院生 1韩青有1
作者信息
- 1. 山东省科学院新材料研究所,山东省轻质高强金属材料重点实验室,山东济南250014
- 折叠
摘要
Abstract
Through scanning electron microscopy,the fracture morphology,graphite morphology and microstructure of the nodular cast iron QT500-7 air compressor shaft were observed.The results indicated that the fracture mode of this shaft belonged to fatigue fracture,and such defects as abnormal nodularizing,floating of graphite and the coarse grains were the important factors causing the abnormal fracture.In addition,the stress concentration near the keyway point and thread root could also initiate the multi-source crack in service,leading to the brittle fracture failure.Therefore,this paper proposed that preventive measures should be strengthened such as furnace examination and metallographic analysis,reasonable shaft structure and avoiding cutting thread in high load area on shaft to ensure the quality of nodular cast iron shaft.关键词
球墨铸铁/疲劳断裂/应力集中/球化不良Key words
nodular cast iron/fatigue fracture/stress concentration/abnormal nodularizing分类
矿业与冶金引用本文复制引用
修大鹏,张素卿,周吉学,杨院生,韩青有..球墨铸铁QT500-7空压机轴异常断裂失效分析[J].山东科学,2017,30(6):41-44,4.
