Desenvolvimento de tribossistema e avaliação da influência de carbonetos no microdesgaste abrasivo da liga Fe-16Mn-5,74Si-10,3Cr-4,73Ni-1,01Nb-0,11C

Abstract

The aim of the present work was to evaluate the influence of the carbides on the abrasive micro-wear resistance of the Fe-16Mn-5,74Si-10,3Cr-4,73Ni-1,01Nb -0,11C alloy (% by mass). For the wear test, a device based on the ASTM G99 Standard Test Method for Wear Testing with a Pin-on-Disk Apparatus was constructed by adapting a lathe. The equipment was evaluated by a wear test of SAE 1045 steel with a force of 10N and rotation of 300 rpm. The Fe-Mn-Si-Cr-Ni-Nb-C alloy samples were submitted to heat treatments of solubilization at 1100 ºC for 1 hour and aging at 650 ºC and 850 ºC for 2 hours. The analyzes were carried out comparing the influence of the carbides in the wear resistance in relation to the percentage of mass lost and the wear rate, given by the ratio between the mass loss of the test body and the total distance traveled during the test. The alloy characterization before and after the wear test was performed by optical microscopy to define the microstructure of the material and the predominant wear mechanism. The constructed device presented a satisfactory result for the analysis carried out and the results showed that the samples aged at 850 ºC presented higher wear resistance, followed by the samples aged at 650 ºC and solubilized, respectively.