• Mahmod, Muhammad Faisal
• Harimon, Mohd Azhar
• Halmi, M. A. M.
• Tobi, L. Mohd

Abstract

This paper contributes to a review of the research of the fatigue behaviour ofthermal spray coatings on carbon steel. Previous studies provide the experimentalcharacterization of the fatigue resistance of coated carbon steel. Different coatingpowders were deposited to a different type of carbon steels. Also, S-N curves weredrawn from axial- and rotating bending fatigue test to determine the fatigue strength orfatigue limit of the samples. Thermal spray coatings showed great improvement to thework hardening effect but worsen the fatigue life due to the inclusion of oxide and pores,the presence of stress concentrators, and high microcrack density. Moreover, the effectsof the surrounding environment have also resulted in pros and cons towards the fatiguestrength. An improvement, however, can be done with the shot peening treatment, whichsignificantly increases the compressive residual stress at interfaces ofcoating/substrate. The high compressive residual stress could delay the cracknucleation, thus increasing the fatigue life of the coated part.

Topics

• density
• pore
• Carbon
• inclusion
• strength
• steel
• fatigue
• spray coating