Obtenção de revestimentos dúplex por nitretação a plasma e PVD-TiN em aços ferramenta AISI D2 e AISI H13.

Iacomini, Franco; Ribeiro, A.L.R.

doi:10.11606/t.3.2003.tde-02102003-114623

Cited by 6 publications

(8 citation statements)

References 36 publications

(53 reference statements)

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“…As previously discussed in the literature by Edenhofer, 1974 apud FRANCO JR. [18], the formation of Fe 4 N phase is favored in atmospheres with low levels of nitrogen and carbon free, and as expected it is not observed in solid nitriding, where the atmosphere is not controlled. Table 2 shows the bulk hardness (HV 1 ) of the steels before the thermochemical treatment and the microhardness (HV 0.01 ) obtained on the surface of the samples, these results were previously discussed by Milan et al, [19].…”

Section: Resultssupporting

confidence: 73%

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Study of the nitrided layer obtained by different nitriding methods

2015

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In this study, plasma nitriding, gas nitriding and solid nitriding were performed in AISI H13, AISI P20 and N-8550 tool steels. The aim of the study was compare the acquired properties after the thermochemical treatments and evaluate the efficiency of the solid nitriding treatment. The samples were analyzed using a microhardness tester and a scanning electron microscope. The typical nitriding layers were observed -white layer and diffusion layer. The phases Fe 4 N -γ´ and Fe 2,3 N -ε were identified using an X-Ray diffractometer.The microhardness values of the nitrided layers obtained by the solid nitriding treatment were compatible with the other values of microhardness obtained by plasma and gas nitriding. The thickness of the nitrided layer obtained by the solid nitriding treatment was irregular.

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Section: Resultssupporting

confidence: 73%

“…Plasma nitriding treatment promotes greater control of different treatment parameters and this enables a higher reproducibility of results and also allows the control of the microstructure of the nitrided layer [18].…”

Section: Introductionmentioning

confidence: 99%

Study of the nitrided layer obtained by different nitriding methods

2015

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“…Entretanto, a tenacidade deste aço é fortemente dependente da distribuição dos carbonetos eutéticos tipo M 7 C 3 . Esta dependência é de particular importância à medida que a dimensão do material de partida deve ser adequada à dimensão final da ferramenta, principalmente quando a matéria prima é proveniente de material cortado em distribuidores [2]. Como em todos os aços hipereutetóides, a resposta ao tratamento térmico é excepcionalmente influenciada pelas condições de austenitização, que definem a quantidade de carbono e elementos de liga dissolvidos na austenita e presentes sob a forma de carbonetos, além, evidentemente, do tamanho de grão austenítico.…”

Section: Introductionunclassified

“…Fornecido no estado recozido, com dureza máxima de 255 HB o aço AISI D2 tem composição química básica: Fe-1,55%C-12,0%Cr, com adições dos elementos de liga Mo e V da ordem de 1,0% para melhorar a resposta ao revenimento. Sua seqüência de solidificação se inicia pela formação da austenita (γ), com o líquido sofrendo uma reação eutética para: γ + M 7 C 3 [1,2,3]. Os carbonetos eutéticos são os principais responsáveis pela elevada resistência ao desgaste deste aço.…”

Section: Introductionunclassified

Nitretação iônica em gaiola catódica do aço ferramenta tipo AISI D2 para trabalho a frio

Sousa¹,

Mendes²,

Valadão³

et al. 2009

Matéria (Rio J.)

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Amostras cilíndricas do aço AISI D2 foram submetidas aos tratamentos térmicos de recozimento, têmpera e revenido e tratadas termicamente em baixas temperaturas para alívio de tensões. Em seguida foram nitretadas em gaiola catódica nas temperaturas de 400 e 480 ºC durante 3 e 4 horas com objetivo de avaliar as melhores condições de tratamento para este material. Nessa técnica as amostras são colocadas num potencial flutuante, dentro de uma gaiola que blinda o potencial catódico. Um estudo sistemático foi realizado para avaliar a eficiência desta técnica na melhoria da dureza deste aço e sem o surgimento dos problemas comuns da nitretação iônica convencional como o efeito de borda. As amostras nitretadas por essa nova técnica apresentaram, para uma duração de tratamento bem inferior, espessuras de camadas, fases cristalinas e durezas, semelhantes àquelas apresentadas na literatura para a nitretação iônica convencional. Observa-se que nas três condições de tratamento térmico, a condição de nitretação que apresentou maior espessura de camada de compostos foi para a duração de 3 horas na temperatura de 480 ºC.

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“…The potential of plasma application as an energy source for hardening ferrous alloys was studied and patented by Fry [10] in the early 1920s in Germany, and by Bason in 1928 [12,13].…”

Section: List Of Tablesmentioning

confidence: 99%

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Filho¹,

dos²

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A concept of plasma treatment for enhancing pre-textured surfaces of components made in pearlitic gray cast iron is proposed. It consists of a plasma nitriding at low temperatures and short times, in order to increase the hardness of the surface by means of a shallow depth nitride formation in the surface of the iron. As a result, the roughness pattern of a previously textured surface is preserved after the treatment. A review on the wear of internal combustion engine cylinders along with background research was conducted, which consisted in the description of cylinder bore wear features observed experimentally. The background research substantiated the significance of initiatives to enhance wear and friction response of pre-textured surfaces made of cast iron, such as the internal combustion engine cylinders. A series of plasma nitriding experiments was run on specimens extracted from engine cylinders. Flat specimens, obtained from blanks extracted from the cylinder wall of an engine cylinder block, were textured in laboratory in order to emulate the typical roughness distribution of an ordinary cylinder bore plateau honing process. Complementarily, a case-study experiment was performed in a honed sample of an internal combustion engine cylinder, whose surface in its original form (cylindrical) has been textured through industrial honing operations. Therefore, one among the potential applications of the research has been assessed. 3-D interference roughness measurements were performed before and after the plasma treatment to assess topographic stability of the textured surfaces. ε-Iron nitride (Fe 3 N) formation was identified via X-ray diffraction analysis. In addition, nitrogen concentration profile was quantitatively evaluated using wavelength-dispersive (X-ray) spectroscopy microanalysis, substantiating the nitride formation at shallow depth. Microhardness measurements and instrumented linear sclerometry test ('scratch test') results indicated that ε-iron nitride formation and solid solution hardening could provide enhanced properties to the surface of general pearlitic cast iron components, such as increase of wear resistance, and decrease of apparent coefficient of friction, in the assessed conditions. The results demonstrated that the roughness texture pattern was satisfactorily preserved after the treatment, which was supported by direct observation of the surfaces via scanning electronic microscopy.

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Obtenção de revestimentos dúplex por nitretação a plasma e PVD-TiN em aços ferramenta AISI D2 e AISI H13.

Cited by 6 publications

References 36 publications

Study of the nitrided layer obtained by different nitriding methods

Study of the nitrided layer obtained by different nitriding methods

Nitretação iônica em gaiola catódica do aço ferramenta tipo AISI D2 para trabalho a frio

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

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