OSCAR OLIMPIO DE ARAUJO FILHO

OSCAR OLIMPIO DE ARAUJO FILHO

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Processing and manufacturing of metal matrix aluminium alloys composited reinforced by silicon carbide and alumina through powder metallurgy techniques
2012 - ARAUJO, EVERTHON R. de; ALVES, SÉRVULO J.F.; AMBROZIO FILHO, FRANCISCO; URTIGA FILHO, SEVERINO L.; ARAUJO FILHO, OSCAR O. de
Preparation of metal matrix aluminium alloys composited reinforced by silicon nitride and aluminum nitride through powder metallurgy techniques
2012 - ARAUJO, EVERTHON R. de; ALVES, SÉRVULO J.F.; SOUZA, MARCIO M.S. de; AMBROZIO FILHO, FRANCISCO; GONZALEZ, CEZAR H.; ARAUJO FILHO, OSCAR O. de
Influencias na resistencia a ruptura transversal do aco rapido M3:2
2004 - ARAUJO FILHO, O.O.; RIBEIRO, O.C.S.; NEVES, M.D.M.; FILHO, F.A.; SILVA, C.H.L.
Transverse rupture strength of a PM tool steel
2005 - ARAUJO FILHO, O.O.; AMBROZIO FILHO, F.; NEVES, M.D.M.; RIBEIRO, O.C.S.; SILVA, C.H.L.
Low-pressure injection molding processing of AISI T15 high speed steel powders
2006 - LIBERATI, JOAO F.; ARAUJO FILHO, OSCAR O.; MONTEIRO, WALDEMAR A.; ESPOSITO, IARA M.; NOGUEIRA, REJANE A.; AMBROZIO FILHO, FRANCISCO
Transverse rupture strenght of M3:2 high speed steel produced through conventional casting and powder metallurgy techniques
2006 - ARAUJO FILHO, OSCAR O.; LIBERATI, JOAO F.; MONTEIRO, WALDEMAR A.; NEVES, MAURICIO D.; SILVA, LUIS C.E. da; AMBROZIO FILHO, FRANCISCO
The main aim of this work is to study the influence of the heat treatment on the transverse rupture strength of three M3:2 high speed steel obtained by differents techniques. PM Sinter 23 obtained by hot isostatic pressing (HIP) of gas atomized powders, a vacuum sintered high speed steel obtained by uniaxial cold compaction and liquid phase sintering of M3:2 water atomized powders and a conventional (cast to ingot and hot work) VWM3C were submitted to hardening in order to determine the influence of this treatment on the transverse rupture strength. The two PM high speed steels and the conventional one were submitted to heat treatment of hardening with austenitizing temperatures of 1140, 1160, 1180 and 1200 °C and tempering at 540 and 560 °C. The effectiveness of the heat treatment was determined by hardness tests (Rockwell C hardness). The microstructure was evaluated by scanning eletronic microscopy (SEM). At least five samples of these three high speed steels were manufactured, austenitized, quenched and tempered as described above and fractured in three point bending tests in order to evaluate the influence of this treatment on the transverse rupture strength (TRS).
Sintering of AISI M3:2 high speed steel - Part II
2006 - ARAUJO FILHO, O.O.; NEVES, M.D.M.; LIBERATI, J.F.; SILVA, L.C.E. da; SALGADO, L.; AMBROZIO FILHO, F.
Grain size of commercial high speed steel
2006 - NOGUEIRA, REJANE A.; ARAUJO FILHO, OSCAR O.; SOUZA, LEONARDO F.M.; LIBERATI, JOAO F.; SALGADO, LUCIO; AMBROZIO FILHO, FRANCISCO
The heat treatment of high speed steel tools consists of austenitizing, quenching and tempering. The size of austenite grains formed during the hardening treatment is an important factor in the final microstructure of the steel, and it also affects properties such as wear resistance and toughness. This paper presents the austenite grain size, matrix composition and hardness of commercial AISI M2, AISI T15, VWM3C and Sinter 23 high speed steels that were austenitized and quenched from five distinct temperatures. This study shows that increase in quenching temperature results in grain growth of steels such as AISI M2 and VWM3C, obtained by the conventional method (cast to ingot and worked). The P/M Sinter 23 high speed steel showed a slight grain growth (about 10%). This effect was not observed in AISI T15 obtained by the powder metallurgy process.
Processing of AISI M2 HSS with addition of NbC by mechanical alloying using two different types of attritor mills
2010 - ARAUJO FILHO, OSCAR O. de; NEVES, MAURICIO D.M. das; GONZALEZ, CEZAR H.; URTIGA FILHO, SEVERINO L.; AMBROZIO FILHO, FRANCISCO