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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influência do cobre na ductilidade a quente dos aços

Pauli, Evandro Armini de 16 February 2001 (has links)
Submitted by Priscila Oliveira (priscila.b.oliveira@ufes.br) on 2016-07-12T15:16:42Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) evandro pauli tese_589_Tese de mestrado para PDF[1].pdf: 10615879 bytes, checksum: 2a74d616fc85fb0aa225f7ce95f3f31f (MD5) / Approved for entry into archive by Patricia Barros (patricia.barros@ufes.br) on 2016-08-11T17:42:34Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) evandro pauli tese_589_Tese de mestrado para PDF[1].pdf: 10615879 bytes, checksum: 2a74d616fc85fb0aa225f7ce95f3f31f (MD5) / Made available in DSpace on 2016-08-11T17:42:34Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) evandro pauli tese_589_Tese de mestrado para PDF[1].pdf: 10615879 bytes, checksum: 2a74d616fc85fb0aa225f7ce95f3f31f (MD5) / A influência de adições de diferentes teores de Cu e a influência da velocidade de resfriamento na ductilidade a quente dos aços foram investigadas, na faixa de temperatura de 750 a 950°C e taxa de deformação de 2x10-3s-1. O efeito do aumento do teor foi muito baixo para amostras testadas a alta velocidade de resfriamento. Amostras ensaiadas a baixa velocidade foram mais sensíveis à variação do teor de Cu, aquelas contendo alto cobre apresentando redução na ductilidade a quente. Foram encontradas fases segregadas ricas em cobre em todas as condições a menos de uma única, de baixo teor e alta taxa de resfriamento. Estas fases ricas, aparentemente, afetaram pouco ou nada a ductilidade a quente dos aços. / The influence of different additions of Cu and cooling rate on the hot ductility of steels have been examined, in the temperature range 750 a 950°C, at low strain rate of 2x10-3s-1 . The effect of increasing Cu level has been found negligible to samples tested at high cooling rate. Samples tested to low cooling rate were more sensible to the Cu level variation, those having high Cu showing impairment in the hot ductility. Cu rich phases have been found in all testing conditions apart from a single one of low Cu and fast cooling rate where no Cu rich phases have been found. Those Cu rich phases apparently have little or no effect on the hot ductility of steels investigated.

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