Fracture Failure Analysis of 20CrMnTi Steel Tractor Power Output Shaft
Author of the article:LI Xinran;LI Ying;SONG Yichen;LI Ping;LI Fengjun
Author's Workplace：School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454003,China;School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;China Yituo Group Co.,Ltd.,Luoyang 471004,China
Key Words：tractor 20CrMnTi steel power output shaft failure analysis
Abstract：
The power output shaft of a tractor breaks when it was rotating in the field.The fracture morphology,chemical composition,metallographic structure and hardness were comprehensively analyzed to explore the failure reasons of the power output shaft.The results show that the chemical composition,micro structure and hardness of the power output shaft meet the technical requirements,and there are a few inclusions in the fracture.The fracture location is the tapering optical axis between the spline and the gear of the shaft head,and the fracture morphology presents a ratchet pattern.The multi-source torsional fatigue fracture is caused by the crack source spreading along the step mode in the shaft section.Under the repeated action of alternating torsional load,the fracture is caused by the stress concentration.
