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자동차용 안전부품의 기계적 성질에 미치는 복탄처리의 영향
김무길 ( M. G. Kim ),정병호 ( B. H. Jung ),정상훈 ( S. H. Jung ),이병찬 ( B. C. Lee ),김상수 ( S. S. Kim ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.1
N/A Decarburized zone of metal tongue which is sued in seat belt for automobiles was carbon-restoration quenched and tempered using nitrogen-methanol gaseous atmosphere. The effects of microstructure and mechanical properties of metal tongue on the effectiveness of carbon-restoration during tempering was studied. Metal tongue showed 20~30㎛ decarburized zone. However, after carbon-restoration, it has uniform microstructure and thus hardness without decarburized zone. Carbon-restoration quenching and tempering process resulted in better wear and corrosion resistances than quenching and tempering process.
박성천(S. C. Park),정상훈(S. H. Jung),권영웅(Y. W. Kwon) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
An analytical study was performed to have temperature and thermal stress distribution on a piston with the change of the 2nd land length of a piston and the existence of knocking in a cylinder. The result showed that the temperature on the skirt region was about 4~10℃ higher than the temperature on the pin region. However the thermal stress on the skirt region was about 4㎫ lower than on the pin region. It may be due to the higher heat release rate on the pin boss than on the skirt. The result regarding the variation of the 2nd land length of the piston showed that the temperature distribution on the piston was getting lower and the thermal stress distribution was getting higher as the 2nd land length of the piston was shorter. As knocking occurred on the skirt region, it had the higher thermal stress distribution on the piston than on the pin region. It is due to the higher temperature and temperature gradient occurred on the piston as the knocking started on the skirt.