陳永傳臺灣大學:機械工程學研究所余和彥Yu, He-YanHe-YanYu2010-06-302018-06-282010-06-302018-06-282009U0001-2008200910471900http://ntur.lib.ntu.edu.tw//handle/246246/187178本研究將JAC1熱作工具鋼施以不同條件(改變溫度、時間、粉末周圍的氣氛、處理方式、催滲劑CeO2添加量等)的固體粉末滲氮處理後，藉由顯微組織的觀察、表層硬度的量測、化學成分的分析及X-ray繞射實驗，研究固體粉末滲氮條件對滲氮效果的影響。實驗結果顯示，鋼料施以固體粉末滲氮時，改變滲氮粉末周圍的氣氛(空氣、氮氣、氧氣或真空)、處理方式(一次或兩次滲氮、一段或兩段滲氮)，對表層硬度和有效硬化深度沒有顯著的影響。而添加適當量的稀土元素之氧化物(CeO2)於滲氮粉末中，可顯著提高滲氮效果，在相同的滲氮溫度(540ºC)及時間(12小時)下，表層最高硬度可提升約24％，而有效硬化深度可增加60％。In this research, solid powder nitriding treatments were applied on JAC1 hot work tool steel under different conditions (temperature, time, atmosphere surrounding the powder, nitriding method, supplement of catalyst CeO2, etc.). By observing the microstructure, measuring the hardness of the surface layer, analyzing chemical compositions and conducting X-ray diffraction experiments, the effects of solid nitriding conditions on the nitriding results of the steel were studied. Experimental results show that there were no significant effects on the hardness of the surface layer and effective hardening depth of the steel subjected to solid nitriding, with changing the atmosphere surrounding the powder (air, nitrogen, oxygen or vacuum) and treatment methods (nitriding once or twice, nitriding with one or two sections). Adding an appropriate amount of rare earth element oxide (CeO2) in nitriding powder could increase the nitriding effect significantly. Under the same nitriding temperature (540ºC) and time (12hr), the highest surface layer hardness could be promoted to approximately 24%, and the effective hardening depth could be increased to 60%.誌 謝....................................................I 文 摘 要...............................................II 錄....................................................IV一章 緒論................................................1.1 前言...................................................1.2 研究動機與目的.........................................2二章 實驗理論與文獻回顧..................................3.1氣體滲氮處理............................................3.2固體粉末滲氮處理........................................4.3稀土元素的催滲機制......................................5.3.1稀土元素滲入鋼表層的機制..............................5.3.2稀土元素在化學熱處理過程中的催滲機理..................6.4軟氮化之硬化機構........................................7三章 實驗設備與方法......................................8.1 實驗規劃...............................................8.2 實驗設備...............................................8.2.1固體滲氮之設備........................................8.2.2實驗儀器..............................................8.3 實驗方法...............................................9.3.1 試片種類及前處理.....................................9.3.2 粉末滲氮處理.........................................9.3.2.1 不同氣氛下粉末滲氮處理............................10.3.2.2 兩段式粉末滲氮處理................................10.3.2.3 兩次粉末滲氮處理..................................10.3.2.4 不同催滲劑含量的粉末滲氮處理......................10.4 鋼料滲氮處理前後之試驗與分析..........................11.4.1 滲氮粉末的熱分析試驗................................11.4.1.1 滲氮粉末的熱重分析與熱示差掃瞄分析................11.4.1.2 滲氮粉末熱裂解時的質譜分析........................11.4.2 電子微探儀(EPMA)試驗................................12.4.3 顯微組織觀察........................................12.4.4 X-ray 繞射(XRD)分析................................13.4.5 硬度試驗............................................13.4.6 有效硬化深度........................................14.4.7 白層厚度量測........................................14四章 結果與討論.........................................15.1滲氮粉末與催滲劑之熱分析...............................15.2滲氮粉末熱裂解氣體分析.................................15.3固體粉末滲氮試驗.......................................17.3.1 滲氮處理條件........................................17.3.2 滲氮氣氛對硬度分佈之影響............................17.3.3 滲氮溫度對硬度分佈之影響............................17.3.4 滲氮時間對硬度分佈之影響............................18.3.5 催滲劑對滲氮層硬度分佈的影響........................18.3.6 兩段式滲氮對氮化層硬度分佈的影響....................19.3.7 兩次滲氮對氮化層硬度分佈的影響......................19.3.8 滲氮層之顯微組織觀察................................20.3.9 白層厚度與滲氮量量測................................20.3.10 電子微探(EPMA)試驗.................................21.3.11 X-ray 繞射(XRD)分析...............................22五章 結論...............................................23 考 文 獻...............................................584616522 bytesapplication/pdfen-US熱作工具鋼固體滲氮有效硬化深度稀土元素催滲劑hot work tool steelsolid nitridingeffective case depthrare earth elementcatalystthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/187178/1/ntu-98-R96522702-1.pdf