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The Structure and Mechanical Properties of Cr4Mo4V Steel Treated by PIII carbonitriding

稀有金属材料与工程 2012年第S1期41卷 176-179页

作者： Ken Yukimura Harbin Institute of Technology Harbin 150001China

The composition and structure of PIII(plasma immersion ion implantation)carbonitrided Cr4Mo4V steel were analyzed using X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),optical microscopy(OM)and *** results indicate that the nitride and carbide are dispersion phase precipitation and except formation of compound other implantation atoms dissolve into martensite *** total concentration of carbon and nitrogen is about 30 at%near the surface,and still keeps at about 20 at%even at the depth of 8μ*** effect of treatment temperature,implantation time and ratio of N2 to CH4 on the hardness and wear resistance of carbonitrided layer are *** is found that the hardness of Cr4Mo4V steel increases after *** highest hardness of samples is 22.3 GPa,which is about 1.8 times than initial *** dry-wear resistance of the samples is also improved after treatment,and the sample with higher hardness shows the better wear resistance.

关键词： Cr4Mo4V steel PBII carbonitriding hardness wear resistance

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Effect of Rare Earths on Structure and Properties of carbonitriding Boronizing Combined Treatment

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Journal of Rare Earths 2007年第S1期25卷 415-418页

作者：叶宏闫忠琳田中青 School of Materials Science and Engineering ChongqingInstitute of Technology

The microstructure, thickness, microhardness and wear resistance of single-boronizing, carbonitriding+boronizing and carbonitriding+RE-boronizing layers of 16Mn steel were investigated respectively. Effect of rare earths on microstructure and properties of the penetrated layer were studied and the mechanism of effects of rare earths was discussed. The result showed that the structure, microhardness, brittleness and wear resistance of the penetrated layer after carbonitriding+ RE-boronizing were better than that of conventional boronizing and carbonitriding, especially the wear resistance of boronized layer was increased remarkably. The RE-boronizing layer of the steel is single phase Fe2B, and RE elements enhanced Fe2B (002) direction texture. The distribution of rare earth element (La) in the layer was non-uniform. RE content is higher between borides than that of the interior of borides. An optimum value of the addition of RE element in the agent was 8%. The average service life of the 16Mn steel brick mould treated by carbonitriding+RE-boronizing was 1.5 times as long as the service life of the mould treated by carbonitriding-boronizing.

关键词： boronizing carbonitriding structure properties rare earths

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Adhesion Studies of Diamond-Like Carbon Films Deposited on Ti6Al4V Alloy after carbonitriding

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Open Journal of Metal 2012年第1期2卷 1-7页

作者： Deiler Antonio Lima-Oliveira Romina Paula Castro Costa Gislene Valdete Martins Evaldo JoséCorat Vladimir Jesus Trava-Airoldi Anderson Oliveira Lobo Fernanda Roberta Marciano Instituto Nacional de Pesquisas Espaciais Sao Josédos CamposSão PauloBrazil Faculdade de Ciencia e Tecnologia da Universidade de Coimbra CoimbraPortugal Clorovale Diamantes Indústria e Comércio S.A. Sao Josédos CamposSao PauloBrazil Universidade do Vale do Paraíba Sao Josédos CamposSao PauloBrazil

Diamond-like Carbon (DLC) coatings have attracted significant attention due to their low friction coefficient, high degree of hardness, chemical inertness, and high wear resistance as well as and their many possible uses in metallurgical, aeronautical, and biomedical applications. However, DLC has low adhesion strength to metallic substrates. carbonitriding was performed before DLC deposition to improve this adherence. Different concentration of nitrogen in the gas mixture was used during the carbonitriding of Ti6Al4V alloy. DLC films were subsequently grown from methane using plasma enhanced chemical vapor deposition. The samples were characterized with Raman scattering spectroscopy, nanoindentation, and tribological tests. Films from 80.0% N2 had the best friction coefficient (0.07) and a critical load of ~22 N. In the scratching test, these films had adhesive failure and they completely detached from the substrate only in the end of the tests. SEM images show carbonitring promoted a significant increase in the surface defects (homogeneously distributed) but without the presence of microcracks. EDX analysis indicated that nitrogen element was diffused throughout the thickness of the samples. Hydrogen and carbon atoms from carbonitriding formed a diffusion-barrier layer that can be used as the first step for DLC deposition. This carbonitriding can also provide a carbide layer, which serves as the precursor for the nucleation and growth of DLC films.

关键词： Diamond-Like Carbon carbonitriding Ti6Al4V Alloy

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Effect of carbonitriding on Endurance Life of Ball Bearing Produced from SAE 52100 Bearing Steels

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Journal of Surface Engineered Materials and Advanced Technology 2013年第3期3卷 172-177页

作者： Karthikeyan Rajan Vinod Joshi Arindam Ghosh Research & Development National Engineering Industries Ltd. Jaipur India.

The present paper reports the unusual enhancement of endurance life of ball bearings subjected to carbonitriding treatment. The microstructure was characterized by scanning electron microscopy and correlated with hardness and X-ray diffraction analysis. Endurance tests at 90% reliability revealed that the carbonitrided bearings exhibit nearly ten times more life than the non-carbonitrided bearings. This is attributed to synergic combination of retained austenitic, fine martensitic microstructure and ultrafine carbide precipitates obtained by carbonitriding treatment.

关键词： carbonitriding Retained Austenite Martensite Endurance Test Bearing Steel

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Effect of rf Plasma carbonitriding on the Biocompatibility and Mechanical Properties of AISI 321 Austenitic Stainless Steel

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Advances in Materials Physics and Chemistry 2014年第2期4卷 33-42页

作者： F. M. El-Hossary A. M. Abd El-Rahman M. Raaif A. A. Seleem M. Abo El-Kassem Physics Department Faculty of Science Sohag University Sohag Egypt Zoology Department Faculty of Science Sohag University Sohag Egypt

AISI 321 austenitic stainless steel was treated using rf plasma carbonitriding with the intention of use low-cost orthopedic implant material in biomedical applications. The treatment process was carried at low working gas pressure of 0.075 mbar in nitrogen-acetylene gaseous mixture to form a superficial carbonitrided layer. The samples were treated using rf inductively coupled at a fixed plasma-processing power of 500 W and for a processing time varied from 4 to 20 minutes. The microstructural, mechanical and tribological properties of the untreated and treated samples were studied. The surface hardness is improved by rf plasma carbonitriding to a maximum of 1468 HV0.1 for plasma-processing time of 16 min. To evaluate the biocompatibility performance, the blood was cultured in RPMI media to test the adhesion of blood cells on the untreated and treated samples. It has been found that the blood adhesion on the treated samples is enhanced with increasing the plasma-processing time. The contact angle of the carbonitrided surfaces is decreased to lower values compared to that of the untreated surface. Furthermore, the carbonitrided layer in-vitro corrosion was tested in Ringer’s solution. A degradation in the corrosion resistance was observed for the sample carbonitrided at low plasma processing time of 4 min. However, the corrosion resistance increased to a maximum value at a plasma-processing time of 8 min then gradually decreased with further increase of plasma processing time.

关键词： Plasma carbonitriding Surface Energy Wear Corrosion Resistance Blood Culture Protein Adsorption

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