Decarburization
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. HVOF-sprayed Coating Over AISI 4140 Steel for Hard Chromium Replacement
The replacement of electrolytic hard chrome (EHC) by high velocity oxy-fuel (HVOF) sprayed coatings is investigated due to the toxicity of EHC process. The wear behavior of AISI 4140 steel coated by HVOF-, EHC-process was compared to quenched and tempered (Q&T) steel using a pin-on-disc apparatus. The wear tests were conducted at room temperature, 10 N appli
Mat. Res.. Publicado em: 28/05/2018
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2. Metallurgical response of an AISI 4140 steel to different plasma nitriding gas mixtures
Plasma nitriding is a surface modification process that uses glow discharge to diffuse nitrogen atoms into the metallic matrix of different materials. Among the many possible parameters of the process, the gas mixture composition plays an important role, as it impacts directly the formed layer's microstructure. In this work an AISI 4140 steel was plasma nitr
Mat. Res.. Publicado em: 21/05/2013
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3. Kinetics of oxyfuel gas cutting of steels
Oxyacetylene flame cutting is a relevant and widespread industrial process. The basic principles of the process lie in rapid high-temperature oxidation of the cut metal. The kinetics of the process depends, among other things, on the composition of the cut metal, the activity of the reactants. In this present work, a report of the role of carbon on the kinet
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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4. Avaliação de revestimentos para proteção contra a descarbonetação de tijolos refratários MgO-C durante o aquecimento de panelas de aciaria = evaluation of coatings for protection against decarburization of refractory bricks MgO-C during heating in steelmaking ladles / Evaluation of coatings for protection against decarburization of refractory bricks MgO-C during heating in steelmaking ladles
Este trabalho tem como objetivo avaliar a proteção contra a descarbonetação de diferentes revestimentos de pintura de tijolos refratários MgO-C usados em panelas de aciaria. A oxidação de tijolos refratários MgO-C leva à perda de espessura dos tijolos e, conseqüentemente, à diminuição da vida útil dos mesmos. Neste trabalho, foram testados trê
Publicado em: 2010
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5. Avaliação dos efeitos da injeção de gás na câmara de vácuo do modelo físico de um desgaseificador RH
Steels with low concentrations of nitrogen, hydrogen and carbon have in large demand lately. The RH process is a secondary refining process that can simultaneously attain significant levels of removal of these interstitial elements from liquid steel. In the RH process, the melt circulation rate plays a very important role in determining productivity of the e
Publicado em: 2008
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6. The effect of the carbon content on the grain size coarsening and on the magnetic properties of the semi processed electrical steels after the final annealing. / O efeito do carbono no aumento do tamanho de grão e nas propriedades magnéticas de aços elétricos semiprocessados após o recozimento final.
Annealing applied by the motors plants that are made on the semi processed electrical steels without an exact and precisious control of the decarburization on the lamination can brings undesirable results on the grain size coarsening and as a result an increasing on the core losses with a significant depreciation on the efficiency of the electrical motors. M
Publicado em: 2006
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7. Influência da temperatura e da atmosfera do plasma na nitretação iônica do aço rápido M2 convencional e sinterizado
O aumento na dureza e na resistência ao desgaste da superfície de aços podem ser melhorados pela aplicação de técnicas de nitretação. A nitretação iônica, ou nitretação a plasma, tem sido grandemente incorporada em muitas aplicações industriais. Este trabalho consiste de um estudo comparativo da influência da temperatura(400,450 e 500 graus)
Publicado em: 2003