Analysis on Causes Leading to Low Fatigue Lifetime Service of Automobile Axle Tubes and Improvement Measures
The failure analysis on fracture samples for fatigue testing taken from the SAE1527 automotive axle tubes was carried out by test methods such as chemical analysis,mechanical performance testing,optical microscopy and scanning electron microscopy.The test results showed that the main cause leading to low fatigue lifetime service of the SAE1527 axle tubes was the unreasonable heat treatment process,which promoted to form the reticular ferrite and bainite structures,resulting in relatively low yield strengths.These improvement measures for ensuring the quenching temperatures and cooling rates in terms of the steel products in production process was proposed.So the formation of poor bainite and ferrite structures in these products was avoided and the fatigue lifetime service of such materials was improved.
万方数据
维普
