Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Study on the Crack Occurrence and Progress by Durability Test for Vehicular Turbine Housing

차량용 터빈 하우징의 내구시험에 의한 균열 발생 및 진행에 대한 연구

  • 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)
  • 신상윤 (경북대학교 금속신소재공학전공) ;
  • 이도훈 (경북대학교 금속신소재공학전공) ;
  • 원순재 (경북대학교 금속신소재공학전공) ;
  • 김동혁 (한국생산기술연구원) ;
  • 예병준 (경북대학교 금속신소재공학전공)
  • Received : 2017.12.06
  • Accepted : 2018.04.24
  • Published : 2018.04.30
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Abstract

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.

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References

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