Characterization the Fatigue Life of the Flame Thermal Spray Parts Applying the Power Function Energy Method

摘要

In order to predict fatigue life of components which are made by 40 Cr steel substrate and thermal spray coated with Ni60A film. From experimental investigation on combined bending and torsion low cycle fatigue performance of samples, the effect of remelting time were compared. Hence, reasonable remelting time which satisfy the low cycle fatigue experiments was obtained. Related material parameters which used in life prediction model were fitted by elastic-plastic stress-strain relationship and least square method which were supposed by Remberg-Osgood. Then, the fitted material parameters were evaluated by the results from low cycle fatigue experiments. Hence, the equation of power function energy method which could apply on flame thermal spray components was established. Meanwhile, the combined bending and torsion fatigue life of flame thermal spray components could predicted under various low load conditions.