한국주조공학회지 (Journal of Korea Foundry Society)

  • 제38권2호
  • /
  • Pages.48-54
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  • 2018
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  • 1598-706X(pISSN)
  • /
  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
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차량용 터빈 하우징의 내구시험에 의한 균열 발생 및 진행에 대한 연구

Study on the Crack Occurrence and Progress by Durability Test for Vehicular Turbine Housing

  • 신상윤 (경북대학교 금속신소재공학전공) ;
  • 이도훈 (경북대학교 금속신소재공학전공) ;
  • 원순재 (경북대학교 금속신소재공학전공) ;
  • 김동혁 (한국생산기술연구원) ;
  • 예병준 (경북대학교 금속신소재공학전공)
  • Shin, Sang-Yun (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Lee, Do-Hoon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Won, Soon-Jea (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University) ;
  • Kim, Dong-Hyoung (Korea Institute of Industrial Technology) ;
  • Ye, Byung-Joon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
  • 투고 : 2017.12.06
  • 심사 : 2018.04.24
  • 발행 : 2018.04.30
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초록

To improve the durability of the turbocharger, it is important to suppress cracking of the turbine housing; therefore, we investigated the initiation and growth of these cracks. First, we initiated a crack in the turbine housing using endurance experiments. After the endurance test, cracks mainly occurred in the valve seat, the nozzle area, and the scroll part of the turbine housing. The results of a fracture analysis of the cracks showed that cracks in the valve seat were initiated by fatigue fracture. This seems to be caused by the accumulation of mechanical and thermal stresses due to vibration of the turbine wheel and high-temperature exhaust gas. Also, cracks in nozzle and scroll area were initiated by intergranular corrosion due to the exhaust gas. Thus, although there are differences in the cause of initiation according to the site, a concentric waveform was observed in all fracture planes. This phenomenon indicates that cracks gradually grow due to repeated stress changes, and the main causes are the temperature difference of the exhaust gas and the vibration caused by the turbine shaft.

키워드

참고문헌

  1. Choi Y, Journal of the Korean Society of Automotive Engineers, "Status of Domestic Turbocharger Technology", 35 (2013) 57-62. https://doi.org/10.4491/KSEE.2013.35.1.057
  2. Choi BL, Journal of Korean Society of Mechanical Technology, "Thermal stress analysis corresponding to fatigue failure on turbocharger", 15 (2013) 875-880. https://doi.org/10.17958/ksmt.15.6.201312.875
  3. Choi BL and Bang LW, Journal of the Korean Society for Power System Engineering, "Thermal stress analysis of the turbocharger housing using finite element method", 15 (2011) 5-10.
  4. Lee IB, Kim KS and Choi BL, Journal of the Korean Society of Mechanical Technology, "A failure prediction of turbine housing due to the vibration excitations and thermal shock loads", 16 (2014) 1631-1636. https://doi.org/10.17958/ksmt.16.4.201408.1631
  5. W.D. Callister, Jr, Materials Science and Engineering, John Wiley and Sons, New York (2007) 232-234.
  6. American Society for Metals, ASM handbook, ASM international, Ohio 13B (2005) 130.
  7. American Society for Metals, ASM handbook, ASM international, Ohio 12 (1992) 364.
  8. W.D. Callister, Jr, Materials Science and Engineering, John Wiley and Sons, New York (2007) 211-215.
  9. American Society for Metals, ASM handbook, ASM international, Ohio 12 (1992) 394.
  10. American Society for Metals, ASM handbook, ASM international, Ohio 19 (1996) 509.
  11. American Society for Metals, ASM handbook, ASM international, Ohio 12 (1992) 161.