The effects of nitriding, cold rolled and shot peening on fatigue life of an automotive lower suspension
arm component which fabricated of SAE1045 steel were investigated. The finite element modeling and
analysis have been performed using finite element analysis software Package MSC.PATRAN/
MSC.NASTRAN and the fatigue life prediction was carried out using MSC.FATIGUE software. The
finite element analysis results indicate a great effect for all surface finish parameters on fatigue life. It
shows that nitriding increased the fatigue life of the component better than shot peening, while cold
rolled effect was between them. In a nut shell, nitriding can be considered as the best surface treatment
to improve the fatigue life of the automotive lower suspension arm which fabricated of SAE1045 steel.