DOI QR코드

DOI QR Code

Development of Controlled Gas Nitriding Furnace(III) : Application of Controlled Gas Nitriding Process and Evaluation of Durability for SCR420H Annulus gear

질화포텐셜 제어 가스질화로 개발(III) : SCR420H 에널러스기어에 대한 제어질화 적용 및 내구성 평가

  • Won-Beom Lee (Eco-Friendly Thermal Surface Treatment R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Minjae Jung (Department of Materials Science and Engineering, Yonsei University) ;
  • Min-Sang Kwon (Daekyeong Heat treatment Co., LTD) ;
  • Taehwan Kim (Technical Research Institute) ;
  • Chulwoo Moon (Platform Safety Technology R&D Department, Korea Automotive Technology Institute (KATECH))
  • 이원범 (한국생산기술연구원 친환경열표면처리연구부문) ;
  • 정민재 (한국생산기술연구원 친환경열표면처리연구부문) ;
  • 권민상 (대경열처리) ;
  • 김태환 (대원강업) ;
  • 문철우 (한국자동차연구원 플랫폼안전기술부문)
  • Received : 2023.04.24
  • Accepted : 2023.05.15
  • Published : 2023.05.30

Abstract

This study investigated the effects of KN and process time on the formation of a compound layer at a nitriding temperature of 540℃ for SCR420H material. As a result of controlled nitriding from 3 h to 20 h at KN 1.2 atm-1/2, compound layers were formed up to about 10 ㎛, and an effective hardening depth of about 460 ㎛ was obtained. Initially, an ε+γ' complex phase was formed, and the phase fraction changed over time, and finally, the fraction of ε phase decreased to less than 1%. With higher KN, the compound thickness increased, a pore layer was formed on the surface, and the surface hardness decreased. By applying the controlled nitriding process, it was possible to produce annulus gears with a compound thickness of 12.8 ㎛ and an ε phase of 5% or less. The annulus gears made through controlled nitriding were mounted on a 6-speed transmission and tested for durability. As a result, the durability test of 250,000 km was satisfied, and the transmission efficiency was also confirmed to be expected.

Keywords

Acknowledgement

이 성과는 정부의 소재부품기술개발사업의 재원(No. 20012857) 및 한국생산기술연구원의 지원(No. JH230003)을 받아 수행된 연구입니다.

References

  1. 김학윤, 박상준 : 표면열처리, 원창출판사 (1997) 1.
  2. W. B. Lee, G. l. Moon, Y. K. Cho, K. M. Lim, and S. G. Byun: J. Korean Inst. Surf. Eng., 43 (2010) 211.
  3. M. A. J. Somers and E. J. Mittemeijer: Metal & Mat. Trans 26A (1995) 57.
  4. M. Yang, C. Zimmerman, D. Donahue, and R. D. Sisson Jr : Journal of Materials Engineering and Performance 22 (2013) 1892.
  5. K. M. Winter : Journal of Materials Engineering and Performance 22 (2013) 1945.
  6. J. Baranowska and M. Wysiecki : Surface and Coatings Technology 125 (2000) 30.
  7. S. R. Hoseini, F. Ashrafizadeh, and A. Kerampur : Iranian J. Sci. & Tech. Trans 34B (2010) 553.
  8. W. B. Lee, K. C. Yu, Y. M. Kim, and J. L. Wi : Korean J. Met. Mater., 54 (2016) 475. https://doi.org/10.3365/KJMM.2016.54.7.475
  9. T. H. Kim, S. W. Son, K. T. Cho, K. A. Lee, and W. B. Lee : J. Korean Inst. Surf. Eng 54 (2021) 267.
  10. Y. M. K, S.W. Son, and W.B Lee : Met. Mater. Int., 24 (2018) 180. https://doi.org/10.1007/s12540-017-7191-x
  11. Ki. H. Kim, W. B. Lee, T. H. Kim, and S. W. Son : Metals 12 (2022) 139.
  12. W. B. Lee and S. Son : J. of the Korean Society for Heat Treatment 36 (2023) 40.
  13. W. B. Lee and S. Son : J. of the Korean Society for Heat Treatment 36 (2023) 86.