EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TOOL STEELS FOR COLD WORK APPLICATION / "Efeito do tratamento térmico na microestrutura e nas propriedades mecânicas de aços-ferramenta para trabalho a frio"

AUTOR(ES)

Edmo Soares Junior

DATA DE PUBLICAÇÃO

2006

RESUMO

Tool steels have important participation in the worldwide market of steels. They are used by metal-mechanical industry as cutting tools, molds, punches, dies etc.Due to the use of great responsibility, it is important to discuss the relationship between microstructure and mechanical properties because it is a common practice in industry to specify heat treatments based mainly in the final hardness of the material without considerations about that for the same value of hardness a tool-steel can present differences in mechanical properties, depending on the heat treatment cycle applied. Thus, the selection of the heat treatment is a relevant technological aspect in the performance of tool steels. The materials selected were VND, Calmax, VF800 and Vanadis 10, being the three first produced by hot ingot casting followed by hot working - conventional route, and the last one by hot isostatic pressing (HIP) process – sintering route. The aim of this work was to evaluate the heat treatment, microstructure and mechanical properties of these four tool steels for cold work application in order to determine the heat treatment able to promote the best relationship hardness-toughness. The results have shown for VND steel the possibility of working with hardness slightly higher than that recommended by the manufacturer, with sensible improvement of strength without, however, the occurrence of an important decrease in toughness. For the Calmax steel the results have shown the possibility of working with hardness values slightly lower than that recommended by the manufacturer, with significant improvement in toughness, without the occurrence of a strength decreasing. For the steels VF-800 and Vanadis 10, the results of lower temperature of tempering than the recommended by the manufacturer have indicated good performance in all mechanical tests, with attention to the absorbed energy results.

ASSUNTO(S)

heat treatment tratamentos termicos acos ferramenta microstructure tool stells microestrutura

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