• 제목/요약/키워드: carburization

검색결과 79건 처리시간 0.023초

Ti-6Al-4V 합금의 미세조직 및 크리프 특성에 미치는 플라즈마 침탄 처리의 영향 (Improvement of Microstructure and Creep Properties of Ti-6Al-4V alloy by Plasma Carburization)

  • 박용권;위명용;박정웅
    • 열처리공학회지
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    • 제17권2호
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    • pp.94-100
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    • 2004

  • In order to improve the wear resistance of Ti-6Al-4V alloy, plasma carburization treatment was newly carried out without consumption of its good specific strength and fatigue life over the temperature. Effect of the plasma carburization was analyzed and compared with the non-treated alloy by microstructural observation, structure characterization and mechanical test. The plasma treated alloy formed a carburized layer of about $150{\mu}m$ in depth from the surface, where a fine and hard particles of TiC and $V_4C_3$ were homogeneously dispersed through the layer. The steady-static creep behaviors of Ti-6Al-4V alloy, using the constant stress creep tester, were investigated over the temperature range of $510{\sim}550^{\circ}C$(0.42~0.44Tm) and the stress range of 200~275 MPa. Stress exponent(n) was decreased from 9.32 of non-treatment specimen to 8.95 of carburized, however, the activation energy(Q) increased from 238 to 250 kJ/mol with the same condition as indicated above. From the above results, it can be concluded that the static creep deformation for Ti-6Al-4V alloy was controlled by the dislocation climb over the ranges of the experimental conditions.

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침탄 공정 대체를 위한 방전 플라즈마 소결 방법 (Spark Plasma Sintering Method to Replace Carburizing Process)

  • 전준협;이준호;서남혁;손승배;정재길;이석재
    • 한국분말재료학회지
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    • 제29권3호
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    • pp.219-225
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    • 2022

  • An alternative fabrication method for carburizing steel using spark plasma sintering (SPS) is investigated. The sintered carburized sample, which exhibits surface modification effects such as carburizing, sintered Fe, and sintered Fe-0.8 wt.%C alloys, is fabricated using SPS. X-ray diffraction and micro Vickers tests are employed to confirm the phase and properties. Finite element analysis is performed to evaluate the change in hardness and analyze the carbon content and residual stress of the carburized sample. The change in the hardness of the carburized sample has the same tendency to predict hardness. The difference in hardness between the carburized sample and the predicted value is also discussed. The carburized sample exhibits a compressive residual stress at the surface. These results indicate that the carburized sample experiences a surface modification effect without carburization. Field emission scanning electron microscopy is employed to verify the change in phase. A novel fabrication method for altering the carburization is successfully proposed. We expect this fabrication method to solve the problems associated with carburization.

  • https://doi.org/10.4150/KPMI.2022.29.3.219 인용 PDF KSCI