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研究生:柯建成
研究生(外文):Cen-chan Ko
論文名稱:SKD61熱作模具鋼表面被覆多元合金及稀土元素(氧化鈰、氧化釔)之微結構分析與耐磨耗研究
論文名稱(外文):A Study of Microstructure and Wear Performance on SKD61 Claded with multicomponent Alloy and Rare Earth Elements (CeO、Y2O3)
指導教授:林原慶林原慶引用關係
指導教授(外文):Yuan-Ching Lin
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:112
中文關鍵詞:多元合金稀土元素非晶質
外文關鍵詞:multicomponent-Alloyrare-earthamorphous
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本文探討添加不同比例稀土元素(氧化鈰與氧化釔),對於SKD61模具鋼表面氬銲被覆多元合金(NiAlTiCoW)被覆層之顯微結構與磨耗行為的影響。並找出影響耐磨耗能力之主要關鍵,以做為SKD61模具鋼表面耐磨耗改質的依據。
研究結果顯示,NiAlTiCoW系列之被覆層均屬於析出強化型機構。添加氧化鈰(CeO)、氧化釔(Y2O3)皆會細化被覆層內的析出強化相。當添加1%的氧化鈰,會使被覆層內的W元素散佈到基地內,導致樹狀晶強化相消失,進而使硬度下降。而添加1.0% Y2O3會降低被覆層稀釋區範圍,導致被覆層的Fe元素含量降低,進而使Fe溶液所能固溶的W元素含量大幅度減少,因此使白色顆粒狀純W析出物變多。
在磨耗實驗結果當中發現,以無添加稀土元素的NiAlTiCoW的被覆層效果最佳,而添加稀土元素CeO與Y2O3,對於被覆試片的耐磨耗性並無明顯的改善,這可能是因為被覆層內的強化相析出物被過度細化所導致。
In this work, an equimolar powder mixture of NiAlTiCoW with different contents of rare earth elements (CeO and Y2O3) was clad on the surface of the SKD61 tool steel using GTAW method. The effects of CeO and Y2O3 on microstructure and wear behavior of the NiAlTiCoW multicomponent clad layer were investigated. Additionally, the major factors that influence wear performance of the clad layers were found out.
  Experimental results show that the NiAlTiCoW clad layer is strengthened by the different precipitates. The addition of CeO and Y2O3 can refine the precipitates. When the addition of CeO is 1 wt.%, the W element is distributed in the matrix, resulting in the disappearance of dendritic reinforcement and the decrease in hardness. When the addition of Y2O3 is 1 wt.%, the dilution zone is reduced, resulting in the decrease in content of Fe element. This can decrease the content of W element dissolved into Fe-liquid. Therefore, the W precipitates with white granular structure are increased.
  The wear test results indicate that the wear performance of the NiAlTiCoW clad layer without rare earth elements is better than that of the NiAlTiCoW clad layer with rare earth elements. This is attributed to the over-refined precipitates in the clad layers.
中文摘要……………………………………………………………………… Ⅰ
英文摘要…………………………………………………………………………Ⅱ
致謝………………………………………………………………………………III
目錄………………………………………………………………………………IV
表索引……………………………………………………………………………VI
圖索引……………………………………………………………………………VII

第一章 前 言…………………………………………………………………1
第二章 文獻回顧………………………………………………………………3
2-1 表面被覆技術之介紹……………………………………………3
2-2 惰氣鎢極電弧銲被覆的特點……………………………………4
2-3 熔融銲接的凝固特徵與形態……………………………………5
2-3-1顯微結構……………………………………………………5
2-3-2銲道外觀形態………………………………………………5
2-4 多元合金系統……………………………………………………5
2-4-1多元合金之發展……………………………………………5
2-4-2多元合金在表面改質的相關研究…………………………7
2-5 稀土元素…………………………………………………………8
2-5-1稀土元素的種類……………………………………………8
2-5-2稀土元素在表面改質的相關研究…………………………8
2-6被覆層強化機構…………………………………………………11
2-7磨耗機構…………………………………………………………12
2-8摩擦理論…………………………………………………………18
第三章 實驗方法與步驟………………………………………………………20
3-1 實驗步驟……………………………………………………… 20
3-2 試片製作……………………………………………………… 20
3-2-1基材的製作……………………………………………… 20
3-2-2熔填材料的成份比例…………………………………… 21
3-2-3被覆材料的製作………………………………………… 21
3-2-4磨耗試片的製作………………………………………… 21
3-3 氬銲被覆方法……………………………………………………………22
3-3-1被覆試片的校正…………………………………………………………22
3-3-2氬銲被覆參數……………………………………………………………22
3-4 被覆層微硬度之量測…………………………………………23
3-5 被覆層顯微組織的觀察與成份分析…………………………………………23
3-6 磨耗試驗…………………………………………………………………24
3-6-1磨耗試驗之條件…………………………………………………………24
3-6-2磨耗量的量測與計算……………………………………………………24
3-6-3磨耗表面的觀察…………………………………………………………26
3-6-4磨耗及分析儀器設備之介紹……………………………………………26
3-6-4-1分析儀器之介紹………………………………………………………26
3-6-4-2磨耗試驗之儀器………………………………………………………27
第四章 結果與討論………………………………………………………28
4-1 被覆層顯微組織與成份分析………………………………………………28
4-2被覆層之X-ray分析………………………………………………………34
4-3多元合金添加稀土元素對被覆層硬度分佈之影響…………………………35
4-4不同被覆層的磨耗行為分析…………………………………………………36
4-4-1 SKD61模具鋼基材的耐磨耗能力評估………………………………36
4-4-2 SKD61模具鋼基材的磨耗表面分析…………………………………37
4-4-3多元合金及多元合金添加稀土元素被覆層的
耐磨耗能力評估…………………………………………38
4-4-4 NiAlTiCoW及NiAlTiCoW添加稀土元素被覆
層的磨耗分析………………………………………………………39
第五章 結論與建議…………………………………………………………45
5-1 結論………………………………………………………………………45
5-2 建議…………………………………………………………………………46
參考文獻…………………………………………………………………………47
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