TEST ANALYSIS OF FATIGUE CRACK PROPAGATION RATE OF BAINITE HOT ROLLING RAIL UNDER DIFFERENT TEMPERED TEMPERATURE

The fatigue crack propagation rate test of Bainite rail steel with MTS810 Materials Testing Machine was studied,and the test data of the fatigue crack propagation rate under different tempered temperature has been analyzed by Paris formula. The result indicates that the fatigue crack propagation rate of Bainite rail steel under different tempered temperature can be described by Paris formula,and crack propagation condition can be forecasted as well.