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研究生:劉乙明
研究生(外文):Yi-Ming Liu
論文名稱:線材切刀應用於雷射鈷基被覆層與熱處理之研究
論文名稱(外文):A study on the application of the laser Cobalt-based cladding for the cutter of the wire rod and its post-cladding heat treatment
指導教授:楊俊彬楊俊彬引用關係
指導教授(外文):Jin-Bin Yang
學位類別:碩士
校院名稱:國立高雄第一科技大學
系所名稱:機械與自動化工程所
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:2002
畢業學年度:90
語文別:中文
論文頁數:76
中文關鍵詞:M6C碳化物雷射被覆析出
外文關鍵詞:precipitateM6CarbidLaser cladding
相關次數:
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  • 收藏至我的研究室書目清單書目收藏:1
傳統刀具的選用是使用高速鋼或工具鋼,其熱處理後硬度雖可達到HRC 62∼65,但因軋鋼廠是屬於熱軋製程,刀具皆處於高溫及高磨耗等嚴苛環境下,更因剪切面剪切1050℃高溫材料,使剪切面因晶粒粗大,碳化物凝聚而軟化,造成切刀提早下線或生產線異常停機,因此在軋鋼廠提升刀具壽命是值得研究的課題。

本研究使用雷射硬面被覆法,於JIS S45C中碳鋼基材表面被覆Stellite 1鈷基合金,探討其對刀具壽命提升之影響,並探討被覆層之熱處理及其衍生之相變化。結果顯示被覆後之切刀經實際剪切使用後,壽命較SKD61刀具壽命提升6倍。因被覆後刀具之顯微組織及表面硬度,使用前後比較並無顯著改變,可維持剪切面之耐磨特性,解決SKD61刀具時壽命不佳的現象。

在本實驗中被覆層經不同熱處理溫度作均質化處理,結果在1000℃以上可大幅改善被覆層Cr偏析於晶界情形,且發現溫度在1000℃硬度值最高,為Hv700。1000℃均質化後再經650℃高溫回火後,硬度值可增加Hv100,經XRD分析顯示在均質化過程中M7C3分解成M6C的碳化物。以TEM進一步解析高溫回火後被覆層顯示M6C 相於富鈷之γ相中呈整合性析出,產生析出硬化之效果。
In general, the high-speed tool or hot tool steel was selected as the material of the cutter. The hardness is from HRC62 to HRC65 after the heat treatment. However the rolling process is conducted in rolling wires, the cutter is under the environment of hot temperature and serves wear. The hardness of the cutter was decline due to the grain size coarsening, which results in the mill line abnormally shut down. It was worth researching to improve the life of the cutter.

In this study,the Stellite 1 cobalt-based alloy was cladding on JIS S45C medium carbon steel by laser. The improvement on the life of the cutter and the phase transformation after the heat treatment of the layer are investigated. The results show that the life of the cutter is elevated 6 times than that of the conventional cutter. It was observed that the microstructure and the hardness of the used cladding cutter are little differences than before. Then the Cobalt-based layer were conducted by the different heat treatment conditions to be homogenized When the temperature is over the 1000 ℃, the Cr segregation is dramatically eliminated. The highest hardness up to Hv700 occur at 1000℃.The hardness will increase Hv100 through tempering at 650℃ following the homogenization at 1000℃. During the homogenization, it is observed that M7C3 decomposed into M6C by XRD analysis. After tempering , M6C coherently precipitates in the Co-rich γmatrix by TEM analysis and the effect of precipitates hardening will be resulted in.
中文摘要……………………………………………………………………………Ⅰ
英文摘要……………………………………………………………………………Ⅱ
致謝…………………………………………………………………………………Ⅲ
目錄…………………………………………………………………………………IV
圖目錄………………………………………………………………………………VI
表目錄………………………………………………………………………………IX

第一章、緒論
1-1 前言……………………………………………………………………………1
1-2 文獻回顧
1-2-1 雷射加工發展歷史………………………………………………………3
1-2-2 雷射加工理論背景………………………………………………………4
1-2-3 被覆合金種類……………………………………………………………9
1-2-4 鈷基被覆層之特性 ……………………………………………………12
1-2-5 熱處理後性質探討 ……………………………………………………13
1-2-6 顯微組織與稀釋率 ……………………………………………………14
1-2-7 被覆層之物理性能 ……………………………………………………14
1-2-8 被覆層的磨耗行為 ……………………………………………………14
第二章、研究動機與目的…………………………………………………………19
第三章、實驗方法與步驟
3-1實驗設計………………………………………………………………………21
3-2實驗用材料……………………………………………………………………21
3-3雷射被覆………………………………………………………………………22
3-4熱處理…………………………………………………………………………22
3-5實驗與分析設備………………………………………………………………23
3-6試片分析………………………………………………………………………24
3-7實際磨耗試驗…………………………………………………………………26
第四章、結果與討論………………………………………………………………34
4-1 SKD61刀具使用前後金相組織與硬度變化分析
4-1-1金相組織變化分析………………………………………………………35
4-1-2硬度變化分析……………………………………………………………35
4-2 被覆刀具使用前後金相組織與硬度分析
4-2-1使用前金相組織…………………………………………………………35
4-2-2使用後金相組織…………………………………………………………37
4-2-3被覆刀具使用前後硬度比較分析………………………………………37
4-3 被覆層熱處理後性質探討
4-3-1 均質化硬度變化探討……………………………………………………40
4-3-2 高溫回火後硬度變化探討………………………………………………40
4-3-3 相變態探討………………………………………………………………41
第五章、結論………………………………………………………………………71
第六章、參考文獻…………………………………………………………………72
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