Resumo O endurecimento secundário de aço rápido AISI M3:2 nome comercial Sinter 23 obtido por uma técnica de metalurgia do pó de sinterização por compactação isostática a quente é objeto desse trabalho de pesquisa. O aço rápido em questão foi austenitizado em banho de sal a 1.140°C, 1.160°C, 1.180°C e 1.200C, temperado ao ar e revenimento a 540°C, 560°C e 580C. Amostras do aço rápido foram fabricadas e submetidas ao tratamento térmico acima descrito e submetida a ensaios de dureza Vickers e Rockwell C para a determinação das suas respostas ao tratamento térmico de endurecimento e avaliação do pico de endurecimento secundário através dos resultados de dureza. Palavras-chave: Aços rápidos; Aço rápido Sinter 23; Endurecimento secundário. SECONDARY HARDENING OF AN AISI M3:2 HIGH SPEED STEEL NAMED SINTER 23 PRODUCED THROUGH POWDER METALLURGY TECHNIQUES Abstract The main aim of this work is to study the behaviour of the secondary hardening of AISI M3:2 high speed steel named Sinter 23 obtained by powder metallurgy technique of hot isostatic pressing submitted to a suitable procedure of heat treatment. Sinter 23 was submitted to hardening in order to study the sencondary hardening behaviour of this steel. The M3:2 high speed steel Sinter 23 was submitted to heat treatment of hardening with austenitizing temperatures of 1,140°C, 1,160°C, 1,180°C and 1,200C and tempering at 540°C, 560°C and finally 580C. The effectiveness and response of the heat treatment was determined by hardness tests (Vickers and Rockweel C hardness) and had its property of secondary hardness evaluated.
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