• failure analysis of a gear tooth facture of a rolling mill decelerator

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 713
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     metallographic examination revealed that the grain size of the material are too coarse and the tempered structure retained a thick needle martensite orientation, thus reducing the steel toughness and raising the gap sensitivity. heat treatment experiment showed that the coarse grains mostly resulted from the ultra high-temperature quenching. the impact toughness of the gear material was too low whereas the yield ratio of the gear material was too high, with a tested value up to 0.89. the hardness of the gear material was also too high, reaching a value of hrc37. the uniformity of the gear material, such as the dispersion of sulfur-rich inclusions, is poor. fractographic analysis indicates that a brittle multi-source fatigue fracture caused by the microstructural defects of the material.

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