This paper is designed to investigate the frictional and powdering characteristics of coating layer on a galvannealed sheet steel with different annealing temperatures of 465, 505, 515 and 540°C. Estimations of powdering and friction were done using a 60°bending test and flat-friction test. In order to clearly understand the effect of each coating on friction, a cross-section of the coatings before and after the friction tests was observed using SEM. The results show that powdering of the coatings increased with the increase of the annealing temperature and that the friction characteristics greatly depend on their powdering, which leads to an increase of the real contact area between the tools and coatings.

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