| Summary: | 碩士 === 國立虎尾科技大學 === 動力機械工程研究所 === 94 === The gear in automobile need to bear repeatedly load and impulsive load , the surface of gears in automobile must be wear-resisting and the core should have good tenacity. After carburization and quenching , low carbon steel AISI 1015 is satisfied in wear-resisting and tenacity , and therefore is highly used in the gear in automobile or other parts with high attack and high attrition. In this study , the finite element simulation package DEFORM－2D was applied to analyze the gear in heat treatment processing. The effects of hardness and microstructure for quenching temperature and quenching time , and the effects of carbon atom content and thickness in carburization in heat treatment processing are also explored.
The research findings are as fallows： The increment of the surface carbon concentration for the carburization time is not obvious , while the increment of the whole carbon concentration is relatively significant. The carburization speed of tooth top is the fastest , tooth middle comes second , and tooth bottom is the slowest. The higher the environment atom content is , the greater the disparity of carbon concentration is between the tooth surface and the internal part. The longer the time of the carburization is, the higher the hardness of the tooth form will be. The longer the time of the carburization is the higher the hardness of the tooth form will be.
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