• Title/Summary/Keyword: Carbonitriding

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The Change in Diffusion Coefficient and Wear Characteristic in Carbonitriding Layer of SCM415 Steel (침탄질화 처리된 SCM415강의 깊이에 따른 확산 및 마모특성 변화)

  • Lee, Su-Yeon;Youn, Kuk-Tea;Huh, Seok-Hwan;Lee, Chan-Gyu
    • Journal of Surface Science and Engineering
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    • v.44 no.5
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    • pp.207-212
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    • 2011
  • In this study, the change in diffusion coefficient and wear characteristic with depth in the carbonitriding layer of SCM415 steel was discussed. To determine the diffusion coefficient, depth profile of carbon was measured from the surface using the Glow Discharge Spectrometer. In otherwise, measurements of carbide fraction, micro vickers hardness of surface and observation of microstructure have been implemented through the SEM image. $Fe_3$(C,N) layer and effective depth were increased as the time for carbonitriding takes longer. According to wear experiment, the results showed that wear resistance was improved by $Fe_3$(C,N) layer and effective depth.

Evaluation of Thermal Characteristics for Warm Forging Die due to Lubricants and Surface Treatments (윤활제와 표면처리에 따른 온간단조 금형의 열적특성 평가)

  • 김종호;김동진;정덕진;김병민
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.833-836
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    • 2000
  • The mechanical and thermal load. and thermal softening which is happened by the high temperature of die, in hot and warm forging, cause wear. heat checking and plastic deformation, etc. This study is for the effects of solid lubricants and surface treatments for warm forging die Because cooling effect and low friction are essential to the long lift of dies. optimal surface treatments and lubricants are very important to hot and warm forging Process. The heat that is generated by repeated forging processes. and its transfer are important factors to affect die life. The main factors, which affect die hardness and heat transfer, are surface treatments and lubricants, which are related to thermal diffusion coefficient and heat transfer coefficient, etc. For verifying these. experiments art performed for diffusion coefficient and heat transfer coefficient in various conditions - different initial billet temperatures and different loads. Carbonitriding and ionitriding are used as surface treatments. and oil- base and water-base graphite lubrirants are used. The effects of lubricant and surface treatment for warm forging die lift are explained by their thermal characteristics.

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Evaluation of Tool Life for Forging Die due to Lubricants and Suface Treatments (단조 금형의 윤활, 표면처리 및 금형 수명 평가)

  • 김병민
    • Transactions of Materials Processing
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    • v.11 no.3
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    • pp.211-216
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    • 2002
  • The mechanical and thermal load, and thermal softening occuring by the rush temperature of die, in warm and hot forging, cause wear, heat cracking and plastic deformation, etc. This paper describes the effects of solid lubricants and surface treatments for warm forging die. Because cooling effect and low friction are essential to the long life of dies, optimal surface treatments and lubricants are very important to hot and warm forging process. The main factors affecting die hardness and heat transfer, are surface treatments and lubricants, which are related to heat transfer coefficient, etc. To verify the effects, experiments are performed for heat transfer coefficient in various conditions - different initial billet temperatures and different loads. Carbonitriding and ionitriding are used as surface treatments, and oil-base and water-base graphite lubricants are used. The effects of lubricant and surface treatment for warm and hot forging die life are explained by their thermal characteristics, and the new developed technique in this study for predicting tool life can give more feasible means to improve the tool life in hot forging process.

The Fatigue Life Evaluation of Gas Nitro-Carburizing Material (침탄질화처리재의 피로수명평가)

  • 송삼홍;이상훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.39-44
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    • 1995
  • The gas nitro-carburizing treatment with the merits of carburizing and nitriding treatment is recently applied to transmission gears. the shafls of an engine oil pump and steering shafls. For all that, the researches of the gas nitro-carburizing treatment are short of the fatigue behavior and the evaluation of fatigue life. In this paer, it is examined for the effect of inclusions and hole defects with fatigue limit and the evaluation of the fatigue strengthaccording tothe hardness and resifualstress with the specimen of a notro-carburizing treatment.

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The Effect of Hardening Methods and Process Parameters on Surface Hardening of Ti-6Al-4V Alloy (Ti-6Al-4V 합금의 표면 경화 시 경화기구 및 공정변수가 표면 경화에 미치는 영향)

  • Seo, D.M.;Y., H. Jeong;Hwang, T.W.;Moon, Y.H.
    • Transactions of Materials Processing
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    • v.28 no.1
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    • pp.27-33
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    • 2019
  • The effect of hardening methods and process parameters on surface hardening of a Ti-6Al-4V Alloy has been investigated in this study. To characterize the effectiveness of the respective surface hardening methods, samples of a Ti-6Al-4V alloy were self-quenched, laser-nitrided, laser-carburized, laser-carbonitrided at the same laser irradiation conditions. This experimental procedure was followed by comparing the microstructural evolutions and mechanical properties of the respective samples after the laser surface hardenings. The hardening characteristics of the respective laser surface hardenings were well defined in this study, and the hardness was significantly influenced by the reaction compounds and laser energy density.