Covering Steel Surface with Carbon Black by CO&lt;sub&gt;2&lt;/sub&gt; Laser

Vasconcelos, Getúlio de; Costa, Gabriela N.P. da; Chagas, Daniele Cristina; Mello, C.B.; Antunes, E.F.

doi:10.4028/www.scientific.net/msf.660-661.249

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Although high technology has been employed in its development, surface properties like hardness, corrosion resistance, friction wear, and fatigue life can be still improved by means of thermochemical treatments. Laser carburizing [1] and plasma nitrocarburizing [2,3,4] surface treatments have been effective to this aim. In fact, increases in corrosion resistance and high surface hardness have been already reported [2,4].…”

Section: Introductionmentioning

confidence: 99%

Biocorrosion of AISI 4340 Steel

Rovetta

Abdalla²,

Khouri

et al. 2012

MRS Proc.

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The objective of the present work is to evaluate the Penicillium candidum filamentous fungi biocorrosion effects on AISI 4340 steel. Small AISI 4340 steel blocks are exposed to a biocorrosion process inside glass tubes containing culture media (Sabouraud Dextrose HIMEDIA broth) inoculated with Penicillium candidum spores for 14 days, at 25ºC constant temperature. The surface microstructures are evaluated by scanning electron microscopy, atomic force microscopy, and the chemical composition by energy dispersive X-ray spectroscopy. Comparison of micrographies before and after biocorrosion shows that surface structures present morphological alterations, suggesting corrosion wear. Grain contours can no longer be visualized and oxygen content on the steel surface increases to 32% after biocorrosion. Besides, topographic parameters like root mean square roughness (Rms), arithmetic mean roughness (Ra) and mean roughness (Rz) increase 57%, 132%, and 71%, respectively, from their initial values. It is concluded that AISI 4340 steel is reasonably susceptible to corrosion.

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Section: Introductionmentioning

confidence: 99%

Biocorrosion of AISI 4340 Steel

Rovetta

Abdalla²,

Khouri

et al. 2012

MRS Proc.

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“…No início, era uma maneira de melhorar a absortividade (fração da intensidade incidente que é efetivamente absorvida pela peça na forma de calor) das superfícies, pois o carbono absorve muito mais o feixe de laser do que uma superfície metálica [3]. Na sequencia, alguns autores como Vasconcelos et al [4] mostraram que o carbono, presente na superfície, poderia difundir melhorando as propriedades tribológicas das peças. Yilbas et al [5] estenderam o conceito de carbonetação dos aços inoxidáveis, classe SAE 304, pela aplicação de uma resina fenólica contendo 5% de partículas de TiC.…”

Section: Introductionunclassified

Tratamentos De Superfície De Ferro Revestido Com Grafita Com Laser a Fibra

Kam¹,

Lima²

2014

ABM Proceedings

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ResumoO presente trabalho propõe a carbonetação a laser de ferro puro para a formação de uma camada endurecida na superfície. A formação de uma camada dura permite obter peças com melhores propriedades tribológicas, mas sem alterar as propriedades volumétricas do sólido. Foram realizados experimentos em quatro condições de tratamento a laser, com uso de uma fonte do tipo fibra de Yb:vidro. Análises microestruturais e de dureza mostraram a formação de camada ledeburítica e martensítica, dependendo das condições experimentais, até cerca de 50 µm de profundidade. Análises por calorimetria permitiram, também, verificar que a absortividade do laser na peça variou entre 30 e 46%. Estes resultados mostram que o uso de laser para a carbonetação de peças ferrosas, com a metodologia proposta, permite um alto rendimento, alta dureza da superfície e baixo aporte térmico ao material. AbstractThis work proposes the laser carburizing of pure iron aiming the formation of a hard surface coating. This hard coating allows better tribological properties without changing the bulk properties of the solids. Four different laser treatments were carried out using a Yb:glass fiber laser. Microstructural and hardness analyses showed the appearance of ledeburite and martensite layers up to 50 µm depth. Calorimetric analyses shown that the laser absorptivity at the surface were on the range 30 and 46%. Accordingly to the current methodology, the laser carburizing of ferrous alloys could be accomplished with high efficiency, high surface hardness and low heat input in the material.

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Thermal Treatment and Improvement of Tribologycal Properties of Automotive Ring by Laser Methods

Oliveira

Santos

Teleginski

et al. 2014

MSF

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This work presents the results of treatments by CO2laser of automotive rings covered with carbon black slurry, aiming to improve the friction rate and the ring lifetime. The results of this treatment were characterized by scanning electron microscopy, Vickers hardness, ball on disk test and X-ray energy dispersive spectroscopy. The scanning electron microscopy showed that the laser treated area extent reaches near to 120 μm depth. The measured hardness was about 950 HV0,05and the friction coefficient lower than 0.2. The energy dispersive spectroscopy along the treated cross section showing carbon diffusion into the metallic substrate.

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Covering Steel Surface with Carbon Black by CO<sub>2</sub> Laser

Cited by 3 publications

References 4 publications

Biocorrosion of AISI 4340 Steel

Biocorrosion of AISI 4340 Steel

Tratamentos De Superfície De Ferro Revestido Com Grafita Com Laser a Fibra

Thermal Treatment and Improvement of Tribologycal Properties of Automotive Ring by Laser Methods

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