The investigation of structural, mechanical and tribological properties of plasma nitrocarburized AISI 1020 steel

Çelik, A.; Karakan, Mehmet; Alsaran, Akgün; Efeoğlu, İhsan

doi:10.1016/j.surfcoat.2005.08.027

Cited by 23 publications

(15 citation statements)

References 13 publications

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“…The expelled nitrogen atoms tend to move toward lower energy position such as grain boundaries, where vacancies are abundant. Then, the nitrogen atoms accumulate at the grain boundaries and form molecular nitrogen which further develops porosities 20. The same phenomenon occurrs in PEB/N treatment, but porosities are much finer.…”

Section: Resultsmentioning

confidence: 74%

Nanocrystalline Structure Produced by Complex Surface Treatments: Plasma Electrolytic Nitrocarburizing, Boronitriding, Borocarburizing, and Borocarbonitriding

Taheri

Dehghanian

Mahmood

et al. 2007

Plasma Process. Polym.

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In present study, the feasibility of improving tribological performance of low carbon chromium steel by applying complex surface treatments which combines the method of Plasma electrolytic saturation (PES) is investigated. The different regimes of diffusion treatments on the surface affect the mechanical and tribological characteristics of the steel substrates by production of nanocrystalline interlayers. The major advantage of the PES technique was shown to be the extremely high nanocrystalline coating growth rate by the aggressive ionized particles. The combination of characteristics far exceeds the capabilities of the diffusion procedure by means of PES technique. It was found that the different compositions of interlayers produced by means of complex diffusion treatments eliminate the sharp slope of the microhardness profile. The gradual decrease of microhardness with distance from the surface, provides a good tribological performance. The boride layer reveals the highest value of microhardness among the produced interlayers. In the case of tribological performance, the boronitrided sample shows the best characteristics which are related to the formation of nanocrystalline nitride layer beneath the top boride layer.

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Section: Resultsmentioning

confidence: 74%

Nanocrystalline Structure Produced by Complex Surface Treatments: Plasma Electrolytic Nitrocarburizing, Boronitriding, Borocarburizing, and Borocarbonitriding

Taheri

Dehghanian

Mahmood

et al. 2007

Plasma Process. Polym.

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“…According to the process temperature, QPQ treatment can be classified into two categories. One treatment is the ferritic nitrocarburizing, which is carried out at temperatures below the eutectic point (590 • C) according to the Fe-N diagram, and the other is austenitic nitrocarburizing, which is carried out above the eutectic point [9]. A considerable number of studies on the effect of ferritic nitrocarburizing on the microstructure and wear resistance of stainless steels have been reported [6,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

Xiang

Liu

et al. 2019

Metals

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The effect of quench polish quench (QPQ) nitriding temperature on the microstructure and wear resistance of SAF2906 duplex stainless steel was investigated. Results showed the surface of the nitrided samples was composed of an oxidized layer, a loose compound layer, a compact compound layer, and a diffusion layer. The oxidized layer was composed of Fe3O4. The main phases of the loose compound layer were CrN, αN, Fe2–3N, and Fe3O4. The compact compound layer was composed of CrN, αN, and Fe2–3N. In the diffusion layer, CrN and expanded austenite (S) were the main phases. The nitrided layer thickness increased from 20 to 41 μm with an increasing temperature of 570 to 610 °C. When the nitriding temperature was above 590 °C, the precipitates in the diffusion layer became coarsened, and their morphologies gradually changed from spherical particulate to rod-like and flocculent-like. Tribotests showed the cumulative mass loss of QPQ-treated samples was much lower than that of the substrate. The cumulative mass loss of the samples nitrided at 610 °C was higher than that at 570 °C during the first 29 h. When the test time was over 29 h, the former was lower than the latter.

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“…Dentre as técnicas de modificação de superfícies encontram-se os tratamentos termoquímicos de superfícies por plasma. Tratamentos termoquímicos de superfícies são processos que visam à adição, por difusão, de elementos químicos na superfície do material com o objetivo de aumentar a dureza e a resistência ao desgaste [3]. O uso de descargas elétricas para o tratamento superficial apresenta vantagens em relação aos métodos convencionais como a redução do consumo de gás e energia, maior uniformidade da camada depositada e a redução do tempo de tratamento.…”

Section: Introductionunclassified

Tratamentos Termoquímicos De Superfície Por Plasma No Aço Aisi 1005

Damin¹,

Maliska²,

Binder³

et al. 2018

ABM Proceedings

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ResumoEste trabalho apresenta uma nova abordagem sobre o emprego sequencial dos tratamentos termoquímicos de superfície utilizando a tecnologia de plasma. No trabalho são avaliados tratamentos de superfície, individuais e sequenciais, de nitretação/cementação. Os tratamentos foram realizados no campo ferrítico com o objetivo de manter as tolerâncias dimensionais. Amostras de aços AISI 1005 foram tratadas em descarga luminescente anormal sendo realizados ciclos únicos de cementação e nitretação e também ciclos conjuntos de nitretação + cementação. Todos os tratamentos foram realizados a 500°C com um tempo de patamar de 3 horas para cada tratamento. A composição da mistura gasosa variou de acordo com o tratamento: nitretação -5%N 2 + 95%H 2 ou 3%N 2 + 97%H 2 ; cementação -5%CH 4 + 95%H 2 . A caracterização microestrutural das amostras foi realizada por microscopia óptica e MEV além de difração de raios-X. Análises de microdureza também foram realizadas. As analises de raios-X mostraram que ocorre a estabilização de uma camada de cementita nos tratamentos de cementação. Nas amostras nitretadas em atmosfera contendo 5% de N 2 foi observada a presença de camada de compostos. Já em atmosferas contendo 3% de N 2 não houve a formação da camada de compostos. A maior profundidade de endurecimento foi obtida para a amostra nitretada + cementada. Palavras-chave: Tratamentos termoquímicos sequenciais; Plasma; Caracterização microestrutural. SURFACE THERMOCHEMICAL TREATMENTS BY PLASMA IN AISI 1005 STEEL AbstractThis paper presents a new approach on the sequential use of surface thermochemical treatments by plasma technology. Single and sequential treatments of nitriding/carburizing are evaluated in this work. The treatments were performed in the ferritic field with the objective of maintaining the dimensional tolerances. AISI 1005 steel samples were treated in an abnormal glow discharge being carried out only carburizing, nitriding, ferritic nitrocarburizing cycles and also sequential cycles of nitriding + carburizing. All treatments were conducted at 500 ° C with a hold time of 3 hours for each treatment. The composition of the gas mixture varied with the treatment: nitriding -5%N 2 + 95%H 2 or 3%N 2 + 97%H 2 ; carburizing -5%CH 4 + 95%H 2 . The microstructural characterization of the samples was carried out by optical and scanning electron microscopy in addition to X-ray diffraction. Microhardness tests were also performed. The X-ray analysis showed the stabilization of a cementite layer in carburizing treatment. In the nitrided samples in atmosphere containing 5% N 2 , it was observed the presence of a compound layer. Already in atmosphere containing 3% N 2 was no formation of a compound layer. The greater depth of hardening was obtained in samples nitrided + carburized.

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The investigation of structural, mechanical and tribological properties of plasma nitrocarburized AISI 1020 steel

Cited by 23 publications

References 13 publications

Nanocrystalline Structure Produced by Complex Surface Treatments: Plasma Electrolytic Nitrocarburizing, Boronitriding, Borocarburizing, and Borocarbonitriding

Nanocrystalline Structure Produced by Complex Surface Treatments: Plasma Electrolytic Nitrocarburizing, Boronitriding, Borocarburizing, and Borocarbonitriding

Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

Tratamentos Termoquímicos De Superfície Por Plasma No Aço Aisi 1005

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