The Mechanical Characteristics of B500c Dual Phase Steel Category, After Two Different Shot Blasting Processes

Abstract

In this paper, an effort was made to enhance the chloride induced corrosion resistance of dual phase steel B500c with the use of shot blasting process. Specifically, after the surface cleaning of steel, which was achieved with the use of the blasting process, positive effects were recorded as far as the corrosion resistance is concerned. In the present study is presented the effect of the corrosion factor on common steel specimens (reference) and on specimens which have been shot blasted with the use of olivine and sinter ball pellets. All the specimens were immersed in the salt spray chamber, and were subsistent to 8 cycles wet/dry per day [1] (according to ASTM B117-94 standard), for various exposure periods. After the corrosion exposure, the results showed an increased corrosion resistance, lower pitting depths and lower mass loss percentages. The three specimens groups (reference specimens, specimens which had been shot blasted with the use of olivine pellets and specimens shot blasted with the use of sinter ball pellets) were subjected to tensile tests. The results showed an improved mechanical behavior for the two latter categories. Precisely, among the two shot blasted categories, olivine specimens demonstrated a better corrosion resistance and mechanical performance than the sinter ball specimens.