Comparison of methods of gas, ionic, and vacuum nitriding

Anichkina, N. L.; Bogolyubov, V. S.; Бойко, В. В.; Denisov, V. E.; Dukarevich, I. S.

doi:10.1007/bf00715819

Cited by 8 publications

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“…Comparing gas nitriding and plasma nitriding, Anichkina et al, [14], verified that the growth rate of the diffusion layer for the ion nitriding of a low alloy steel is greater than that obtained by gas nitriding. Plasma nitriding is faster than conventional gas nitriding due to the different mechanisms of nitrogen introduction into the metal [15].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Study of the nitrided layer obtained by different nitriding methods

2015

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“…A nitretação gasosa é bastante discutida e estudada, podendo citar algumas referências: Anichkina et al, (5) fizeram um estudo comparativo da nitretação à gás, iônica e a vácuo e demonstrou que a taxa de crescimento da camada de difusão durante a nitretação iônica de um aço baixa liga é de 2 a 5 vezes maior do que a obtida por nitretação gasosa. A nitretação iônica, também assegura a remoção da camada de óxido e ativação da superfície, sendo eficiente em aços de alta liga aumentando a taxa de saturação significantemente.…”

Section: Introductionunclassified

Efeito De Diferentes Métodos De Nitretação: Sólida, Gasosa E a Plasma Sobre O Comportamento Ao Desgaste De Aços Ferramentas

Milan,

Almeida,

Oliveira

et al. 2009

ABM Proceedings

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ResumoNeste trabalho tratamentos termoquímicos de nitretação (nitretação a plasma, nitretação gasosa e nitretação sólida) foram aplicados em aços ferramenta (AISI H13, AISI P20 e N-8550), com o objetivo de comparar e avaliar o desempenho tribológico e as propriedades adquiridas nos três processos e comprovar a eficiência da nitretação sólida. Testes de desgaste foram conduzidos em equipamento convencional de pino sobre disco, e foram levantados o coeficiente de atrito e a taxa de desgaste, esta avaliada com o auxílio de um perfilômetro. As amostras foram cortadas tranversalmente após o teste de desgaste, sendo posteriormente analisadas através de microdureza e microscopia eletrônica de varredura, para verificar a formação das camadas típicas de nitretação (camada branca e de difusão). A nitretação sólida apresentou bons resultados, proporcionando a formação de uma camada nitretada com microdureza compatível a obtida nos outros processos e os melhores resultados de desgaste. A maior desvantagem encontrada foi a irregularidade da espessura da camada formada. Palavras-chave: Nitretação sólida; Comportamento ao desgaste; Aços ferramenta.

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“…Results of vacuum nitriding of steels in an arrunonia atmosphere fed cyclically into an electric furnace are described in [8]. It is shown that the rate of this process is much higher than in gas nitriding.…”

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“…A glow discharge is excited between the cathode and the anode, and gas ions bombard the surface of the cathode, heating it to a saturation temperature of 470 -580~ The process is conducted at an operating voltage of 400 -1100 V for 1 to 24 h [1]. Results of ion nitriding for the studied steel in an atmosphere of dissociated ammonia in comparison with results of gas nitriding are presented in Table 1 [8]. It can be seen that the ion method is preferable to gas nitriding as regards the ultimate bending strength and the rate of nitrogen saturation.…”

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Strengthening steel 38Kh2MYuA by nitriding in various media

Savintsev¹

1997

Met Sci Heat Treat

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At the present time critical parts of various machines and equipment operating under conditions of wear under cyclic loads are often produced from low-alloy steel 38Kh2MYuA. Its operating properties are usually improved by surface strengthening by the method of nitriding. A wide range of nitrogen-saturating atmospheres has been developed for this purpose, with each diffusion medium characterized by special process properties. The present paper is an analysis of data on nitriding structural steel 38K.h2MYuA in gas, liquid, ionic, vacuum, and powder nitrogen-bearing media. Recommendations are given for practical use of nitriding of the studied steel so as to obtain the requisite operating properties.Gas nitriding is often conducted in dissociated ammonia NH 3 (25-60%) at 520-560~ with the formation of nitrogen ions that are adsorbed by the surface and diffuse into the depth of the metal. For steel 38Kh2MYuA (0.35-0.42% C, 1.35-1.65% Cr, 0.15-0.25% Mo, 0.7-1.1% AI, 0.2-0.45% Si, 0.3-0.6% Mn) the duration of the process depends on the requisite thickness 'of the nitrided layer and amounts to 24 -60 h.Another variant consists in nitriding at 570~ for 5 -10 h in an atmosphere containing 50% endogenic gas and 50% ammonia. As a result of this treatment a thin carbonitride layer (Fe, M)2_s(N, C) with a hardness of 600-1000 HV that possesses insignificant brittleness and high wear resistance is formed on the surface of the steel. This treatment increases considerably the endurance limit of the parts [1].One of the methods for intensifying the nitriding process consists in treating the steel in ammonia with an additive of 6 vol.% oxygen [2]. In this case the diffusion layer is characterized by high physical and mechanical properties. The saturation rate in the medium of ammonia and oxygen is about twice that in conventional nitriding, but the method is dangerously explosive, which limits is use.Another promising technique for nitriding steel 38Kh2MYuA consists in using a mixture of ammonia and air. The diffusion layer formed consists of a zone of internal nitriding and a zone of chemical compounds having the form of a composite layered structure. The activating effect of the air Pskov Polytechnic Institute of St. Petersburg State Engineering University, Pskov, Russia. in the saturating atmosphere is caused not only by the lowering of the partial pressure of ammonia but also by the fact that the air oxygen promotes the formation of a large number of active centers on the surface through which nitrogen penetrates the metal. This promotes the formation of a nitrided layer that is uniform over the thickness and possesses a high corrosion resistance [2].A widely used controlled nitriding process consists in changing the nitrogen potential of the atmosphere by diluting the ammonia with ammonia-dissociated nitrogen (25% N + 75% H 2), air, and carbon-containing gases. By controlling the nitrogen potential of the atmosphere we can obtain a diffusion layer with a developed nitride zone (e or y ' ), which is important for parts ope...

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Comparison of methods of gas, ionic, and vacuum nitriding

Cited by 8 publications

References 0 publications

Study of the nitrided layer obtained by different nitriding methods

Study of the nitrided layer obtained by different nitriding methods

Efeito De Diferentes Métodos De Nitretação: Sólida, Gasosa E a Plasma Sobre O Comportamento Ao Desgaste De Aços Ferramentas

Strengthening steel 38Kh2MYuA by nitriding in various media

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