本文主要探討不同熱處理程序對高碳工具鋼(high carbon tool steel)及軸承鋼(bearing steel)其顯微組織的影響，並且檢測其硬度，使用迴轉式磨耗試驗機以銷對盤(pin on disc)的方式評估其耐磨耗能力的優劣。
實驗結果顯示兩種鋼料淬火過後立即進行超深冷處理能夠有效的消除殘留沃斯田鐵，但超深冷時間的增長，殘留沃斯田鐵的量並無明顯下降。此外，含鉻元素能夠讓M_s及M_f點提升，使得軸承鋼殘留沃斯田鐵明顯比高碳工具鋼少。兩種鋼料經過超深冷處理，均能夠析出細小的超深冷碳化物，並隨著超深冷處理時間增加，獲得更多細小的超深冷碳化物。X-ray繞射分析結果顯示，高碳工具鋼內含有Fe3C及Fe7C3型碳化物，軸承鋼內含有M3C、M7C3型碳化物，並且鉻元素能夠促使更多碳化物析出，使軸承鋼含碳化物的面積百分比比高碳工具鋼高。此外，熱處理過後均能提升試片的耐磨耗能力，其中，軸承鋼耐磨耗能力優於高碳工具鋼，主要原因在於有效消除殘留沃斯田鐵且能獲得更多細小的碳化物。軸承鋼淬火後，回火一小時，進行超深冷處理二十四小時，再回火一小時，此種試片經二次回火程序讓基材更富有韌性並且其碳化物為所有試片最多者，因此其耐磨耗能力優於其它試片。

In this study discusses the effect of different heat treatment conditions
on the microstructure of high carbon tool steel (SK2) and bearing steel (SUJ2) , measured the hardness and using rotating tribometer in pin on disc mode to evaluate the wear resistence
Experimental result shows that there are amounts of retained austenite on both materials after quenching, immediately the deep cryogenic treatment following quenching process can effectively reduce retained austenite. When the time of the deep cryogenic was prolonged, the retained austenite can not reduce obviously. Adding Chromium atoms makes it elevate the〖 M〗_s and M_f points so that the retained austenite of the bearing steel is significantly less than the high carbon tool steel. The amount of deep cryogenic carbides were precipitated , when holding the deep cryogenic process on the both materials .With the time of the deep cryogenic process increased, it can precipitate more deep cryogenic carbides. The result of X-ray diffraction showed that carbides in the matrix include Fe3C、Fe7C3 in the high carbon tool steel and M3C、M7C3 in the bearing steel. Adding Chromium atoms can precipitate more carbides make the area fraction of the carbides of the bearing steel were higher than high carbon tool steel. After the heat treatment , the wear resistence of the specimens can be improved. Bearing steel has the best wear resistance compared to high carbon tool steels. It is because effectively elimination the amount of retained austenite and precipitation of more fine carbides. Among all the specimen underwent the heat treatment of the condition Q-T1hr-C24hr-T1hr of bearing steel has the best wear performance which may caused twice tempering can improve matrix’s toughness and its carbides are the most of all the test pieces, so its wear resistance is superior to other test pieces.

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