| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 96 === Due to high hardness and wear resistance, high carbon tool steel is widely applied in woodworking tools. High carbon tool steel with poor hardenability can not achieve good microstructure and wear resistance through the oil quenching process. Although high carbon steel can be well hardened by water quenching, dimensional change and quenching cracking are concerned. The hardenability of high carbon steel can be approved by the addition of molybdenum and chromium. With alloying elements addition higher martensite percentage and good wear resistance can be obtained. In this study wear resistance of SK85, SK85+0.15wt%Cr, SK85+0.25wt%Cr, SK85+0.15wt%Cr+0.20wt%Mo, SK85+ 0.20wt%Mo, and SK85+0.40wt%Mo are analyzed. The aims of this study are (1) to establish the heat-treatment parameters for quenching and tempering processes, (2) to analyze the effects of Cr and Mo on the wear resistance (3) to observe the size and distribution of carbide by TEM and X-ray (4) to establish the wear mechanis.
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