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Santos, D.B.; Luz Ferreira, O. da; Ribeiro, O.L.R.
Proceedings of the 6. Brazilian Congress on Engineering and Materials Science1984
Proceedings of the 6. Brazilian Congress on Engineering and Materials Science1984
AbstractAbstract
[en] The microstructure of a high-speed steel was studied through the scanning electron microscope. The carbide chemical composition was determined by the X-ray energy spectroscopy. The analyses were done in situ and in precipitate extracted from carbon replica. The phases were shown through the X-ray diffraction in the wastes from electrolytic use. In the annealed structure, some carbides as M6C, MC and M23C6 and in the annealed and drawing back structure, carbide as M6C and MC were seen. The volumetric fraction of each type was calculated by quantitative metalography. The utilization of the replica technique allows the analysis of carbides smaller than 1 μm without the matrix interference. (E.G.)
[pt]
A microestrutura de um aco rapido foi estudada atraves de microscopio eletronico de varredura. A composicao quimica dos carbonetos foi determinada por espectroscopia de energia dispersiva de raios X. As analises foram realizadas 'in situ' e em precipitados extraidos por replica de carbono. As fases foram identificadas por difracao de raios X sobre residuos extraidos apos ataque eletrolitico. Na estrutura recozida foram encontrados carbonetos do tipo M6C, MC e M23C6 e na condicao de temperado e revenido, M6C e MC. A fracao volumetrica de cada tipo foi calculada por metalografia quantitativa; caracterizando-se os carbonetos atraves de ataque seletivo. A utilizacao da tecnica de replica permitiu a analise de carbonetos menores do que 1 μm sem a interferencia da matriz. (Autor)Original Title
Mudancas estruturais dos carbonetos em um aco rapido tipo M2 apos tratamentos termicos de tempera e revenimento
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Source
Pontificia Univ. Catolica do Rio de Janeiro (Brazil); 399 p; 1984; p. 68-72; 6. Brazilian Congress on Engineering and Materials Science; Rio de Janeiro, RJ (Brazil); 9-12 Dec 1984
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Miscellaneous
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Conference
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