Efeito da deformação plástica prévia na resistência ao desgaste abrasivo de aços inoxidáveis

Abstract

The main issues regarding emergency breakdown at industrial plants is the premature component wear. In certain applications, the combination of mechanical wear with corrosion is harmful, such as observed in sugar cane processing plants, ore treatment, among others. The use of stainless steel on those applications are the main motivation for the present study. The purpose of this work was to investigate the effect of hardening on abrasive wear on stainless steels. For this, three types of stainless steels were used: ferritic, austenitic, and ferritic-austenitic (duplex). The samples were previous deformed by 15% and 30% of their initial thickness. Tests were performed in two different levels of severities using macroabrasion rubber wheel test and free sphere microabrasion tests. In addition, the hardness profile of the samples was carried out before and after the tests. Those measurements were performed in cross sections of the sample. In the case of worn samples, the hardness profile was measured below the wear scars. The results showed increment of 9% of wear resistance in microabrasion tests performed in ferritic steels subjected due to the cold work. The results presented no influence of previous cold working on macroabrasion wear tests. Analyzes of the wear scars showed that the dynamics predominant in the interface is the particle sliding for microabrasion tests and the particle rolling/sliding for macroabrasion tests. As expected, the different particle dynamics resulted in different wear micromechanisms.