本論文主要係研究鐵-1.0碳-1.0矽-7.1鉻-2.8鉬合金工具鋼，經過不同的熱處理條件後所表現之機械性質，尋找出最佳的熱處理條件，研發具有高硬度、高韌性的冷作模具鋼。並以光學顯微鏡（O.M.）、穿透式電子顯微鏡（T.E.M.）及掃描式電子顯微鏡（S.E.M.），觀察該材料經淬火回火後顯微結構暨破斷面之變化，探討顯微組織與機械性質的關係。實驗結果顯示：（1）本實驗合金之機械性質與日立公司SLD10鋼種相當，且比AISI D2鋼種為優；（2）在光學顯微鏡的觀察下，在高溫回火時形成回火麻田散鐵之趨勢逐漸明顯；（3）在穿透式電子顯微鏡的觀察下，固溶後存在有Cr23C6、Cr7C3、Cr3C2之碳化物、麻田散鐵與雙晶組織，而在高溫時效後析出物細緻且均勻；（4）在掃描式電子顯微鏡的觀察下，發現本實驗鋼種經過淬火-回火的熱處理後，由其破斷面觀察中得知為凹渦狀之韌性破斷；（5）本實驗鋼種之最佳熱處理條件的範圍，在加熱1020℃~1070℃，保持30分鐘後油淬，施以高溫530℃~550℃二次回火，可以確保HRC63的高硬度及16.5Joule/cm2的衝擊值，得到高硬度高韌性之冷作工具鋼。

This thesis statement is designed for the research of Fe-1.0 C-1.0 Si-7.1 Cr-2.8 Mo Alloy Tool Steel, after several heat treatment process of being heated, finding the best thermal condition and to develop the highest hardness level and highest tenacity cold steel model. With the observation through optical microscope (O.M.)、transmission electron microscope (T.E.M.) &scanning electron microscope (S.E.M.) , to study the changes to the microstructures of the materials after the process of being heated in and out of the fire and to be utilized for research of the relationship between microstructure and its mechanical characteristics.As the result of the experiment: (1) Mechanical characteristics of the experiment alloy are as good as SLD10, and are better than AISI D2 (2)With the observation under the (O.M.), after the process of being heated under high temperature, the tendency of tempered martensite became clear. (3) With the observation study under the (T.E.M.), carbide of Cr23C6、Cr7C3、Cr3C2 &martensite &twinning was discovered. (4) With the observation study under the (S.E.M.), as the result of the heating process of the experimental steel, toughness rupture of the dimple was discovered under the observation of its rupture plane. (5) The best way to create the cold tool steel with high hardness level and high tenacity was discovered through the observation of this experimental steel under the heat treatment process at the continuation temperature of 1020℃~1070℃, maintained at 30 minutes and then reheated twice at 530℃~550℃. the highest hardness level of HRC63 could be kept at the best force of impact rate of 16.5Joule/cm2 and get the highest hardness level and highest tenacity cold tool steel.

第一章 前言……………………………………………………1第二章 文獻回顧………………………………………………4 2-1簡介……………………………………………………4 2-2 AISI D2冷作模具鋼…………………………………7 2-3 JIS SKD11冷作模具鋼………………………………8 2-4大同公司DC53冷作模具鋼……………………………9 2-5日立公司SLD10 冷作模具鋼…………………………11第三章 研究方法與步驟………………………………………13 3-1實驗材料與實驗流程………………………………13 3-2熱處理………………………………………………16 3-3硬度試驗……………………………………………18 3-4衝擊試驗……………………………………………18 3-5耐磨耗試驗…………………………………………18 3-6金相觀察……………………………………………19 3-7 TEM試片製作及觀察………………………………19 3-8 SEM破斷面觀察……………………………………20第四章 結果與討論 4-1淬火熱處理…………………………………………21 4-2回火熱處理…………………………………………22 4-3耐磨耗試驗…………………………………………24 4-4顯微組織結構分析…………………………………25 4-5破斷面檢視分析……………………………………28 4-6與 SLD10、AISI D2 工具鋼之比較………………29第五章 結論……………………………………………………62

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