本研究主要探討高碳工具鋼(SK 2)及高鉻模具鋼(SKD 11)在不同的熱處理程序下對其機械性質的影響。實驗結果顯示淬火處理後立即進行超深冷處理有效消除殘留沃斯田鐵。穿透式電子顯微鏡對於顯微結構進行分析，在高碳工具鋼(SK 2)下找到Fe3C、M7C3型碳化物，在高鉻模具鋼(SKD 11)下找到Fe3C、M7C3、Cr23C6型碳化物，淬火處理完立即進行超深冷處理十二小時，可以促進碳化物的析出，進而提升材料的硬度。
進行不同溫度的回火軟化實驗結果顯示，高鉻模具鋼(SKD 11)其回火軟化的行為較不明顯。因此進行乾磨耗時，因摩擦表面高溫而產生的臨場回火軟化的現象減少，進而使高鉻模具鋼(SKD 11)的耐磨耗能力優於高碳工具鋼(SK 2)。其中，淬火處理後進行回火200 °C一小時，再進行24小時超深冷處理之試片，其耐磨耗能力均優於其他處理程序的試片。

This study discusses the impact of high carbon tool steel (SK 2) and high chromium die steel (SKD 11) under different heat treatment programs for its mechanical properties. Experimental results show that immediately doing cryogenic treatment effectively eliminate residual austenite after quenching. Microstructure analysis using Transmission Electron Microscope showed that the Fe3C、M7C3 carbide in the tool steel and Fe3C、M7C3、Cr23C6 carbide in the die steel. Twelve hour cryogenic treatment immediately after quenching treatment can promote the carbides precipitation, and thus enhance the hardness of the material.
Temper softening experimental results show that temper softening behavior of high chromium die steel (SKD 11) is not obvious.Therefore, when in situ temper softening phenomenon of SKD 11 can be reduced in dry wear test, thereby enhance the wear resistance. Among all heat treatment programs, the best wear resistance can be achieved by quenching, one hour tempering at the temperature of 200 °C, and 24 hour cryogenic processing.

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