RESUMOO objetivo é analisar, do ponto de vista estrutural e das propriedades mecânicas, os resultados obtidos com a realização do tratamento térmico de têmpera e o tratamento termoquímico de cementação realizado em aço 1040. Foram realizados ensaio de dureza Rockwell superficial (30 N) em todas as amostras, além da análise micrográfica, verificando-se a microestrutura obtida pela realização desses tratamentos; comparando-se com um padrão previamente estabelecido. Comprovou-se, através da análise dos dados obtidos, que ocorreu o aumento considerável da dureza nas peças, bem como a visualização da mudança estrutural sofrida com esses tratamentos.Palavras-chaves: têmpera, cementação, micrográfica, Rockwell superficial. COMPARATIVE ANALYSIS BETWEEN THE THERMAL TREATMENT (STATE OF HARDENESS) AND TERMOQUIMICO TREATMENT (CEMENTATION), CARRIED THROUGH IN STEEL 1040. AbstractThe objective is to analyze, of the structural point of view and the mechanical properties, the results gotten with the accomplishment of the thermal treatment of state of hardeness and the term chemistry treatment of cementation carried through in steel 1040. They had been carried through superficial rockwell hardness test (30 N) in all the samples, beyond the micrographical analysis, verifying it microstructure gotten for the accomplishment of these treatments; comparing itself with a standard previously established. One proved, through the analysis of the data gotten, that occurred the considerable increase of the hardness in the parts, as well as the visualization of the suffered structural change with these treatments.
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