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研究生:黃梧哲
研究生(外文):Wu-Chan Hung
論文名稱:氬銲後熔處理在420不鏽鋼火燄塗層之研究
論文名稱(外文):Remelting treatment of 420 stainless steel flame spray coating by TIG method
指導教授:吳威德吳威德引用關係
指導教授(外文):Weite Wu
學位類別:碩士
校院名稱:義守大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:中文
論文頁數:60
中文關鍵詞:氬銲火燄噴銲後熔420不鏽鋼
外文關鍵詞:TIGflame sprayremelting420 stainless steel
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本研究主要在探討利用火燄噴覆製程噴覆420不鏽鋼粉末配合氬銲後熔處理的可行性。探討(1)從試片噴砂前處理,噴砂粒度大小與角度等因素會對表面粗糙度所造成的影響(2)噴覆製程中的影響因子如噴覆時間、噴覆距離、移動速率與基材溫度等的控制(3)氬銲後熔製程中電流大小等銲接參數對覆層後熔的影響。
研究結果顯示:(1)在噴砂的過程中,表面粗糙度6μm以下,表面粗糙度與噴砂顆粒大小及噴砂角度成正比;以氧化鋁砂60號的顆粒,噴砂角度90°所得到的表面粗糙度3.9μm,適用於火燄噴覆條件。(2)在火燄噴覆的過程中,氧氣壓力3 kg/cm 與乙炔壓力0.5 kg/cm ,打底粉流量為2.57 ml/min,噴覆距離15~25cm,420不鏽鋼粉末流量為3.38 ml/min,噴覆距離25~35cm,可以得到極佳的火燄覆層。(3)氬銲後熔製程中,銲接電流150A,走速1500 mm/min,電弧高度距試片高1cm,保護性氣體壓力16 l/min,可成功地完成氬銲後熔。

The main purpose of this study is to investigate the possibility of remelting 420 stainless steel flame spray layers by using TIG method. The study was focused on the influence of (1) the blast grain size and sanding angle on surface roughness of substrate; (2) the spraying parameters during the spraying process; (3) the welding parameters with remelting treatment.
The following results ware revealed in this study. (1) Under surface roughness 6μm, surface roughness is proportional to blast size and sanding angle; No.60 blast with 90°angle results in the surface roughness of 3.9μm which can be used at flame spray process. (2) Flame spraying process, with oxide pressure 3 kg/cm and acetylene pressure 0.5 kg/cm2, the flow of bond coating powder 2.7 ml/min, spray distance 15~25cm, the flow of 420 stainless steel 3.38ml/min, spray distance 15~25cm, can get the finest flame spray coating. (3) Remelting by TIG process, with welding current 150 A, moving speed 1500 mm/min, arc length 1mm and shielding gas 16 kgf/cm3, could successfully achieved this work.

中文摘要………………………………………………………………………………..Ⅰ
英文摘要………………………………………………………………………………...Ⅱ
致謝……………………………………………………………………………………...Ⅲ
目錄……………………………………………………………………………………...Ⅳ
圖表目錄………………………………………………………………………………..Ⅶ
第一章 緒論…………………………………………………………………………….1
第二章 文獻回顧……………………………………………………………………….2
2-1 噴覆理論………………………………………………………………………2
2-1.1 噴覆概述……………………………………………………………….2
2-1.2 火燄噴覆之工作原理………………………………………………….3
2-1.3 粉末火燄噴覆層結合機構…………………………………………….5
2-1.4 粉末火燄噴覆層的組織結構性質…………………………………….6
2-2 粉末火燄噴覆之製程變數……………………………………………………9
2-2.1 噴前處理……………………………………………………………….9
2-2.2 製程操作變數…………………………………………………………11
2-2.3 打底層…………………………………………………………………13
2-3 噴覆層破壞機構………………………………………………………………15
2.3-1 噴覆時所產生的殘留應力…………………………………………….15
2-3.2 熱膨脹差異所引起之應力…………………………………………….16
2-3.3 打底層氧化…………………………………………………………….17
2-3.4 覆層中裂縫的成長…………………………………………………….19
2-4 氬銲後熔製程………………………………………………………………..20
2-4.1 氬銲工作原理………………………………………………………….20
2-4.2 氬銲後熔製程操控變數……………………………………………….21
第三章 實驗方法與步驟……………………………………………………………….23
3-1 火燄噴覆氬銲後熔製程………………………………………………………24
3-1.1 噴覆材料及設計……………………………………………………….24
3-1.2 噴覆試片前處理……………………………………………………….25
3-1.3 噴覆製程……………………………………………………………….26
3-2 氬銲後熔製程…………………………………………………………………27
3-3檢驗與分析…………………………………………………………………….29
3-3.1試片的研磨拋光與腐蝕………………………………………………..29
3-3.2光學顯微鏡組織分析…………………………………………………..29
3-3.3 SEM組織分析………………………………………………………….29
3-3.4 微小硬度試驗………………………………………………………….30
第四章 實驗結果與討論……………………………………………………………….31
4-1 製程實驗參數分析……………………………………………………………31
4-1.1 噴砂實驗結果分析…………………………………………………….31
4-1.2製程操作變數研究……………………………………………………..34
4-2氬銲後熔製程研究…………………………………………………………….40
4-2.1 後熔銲接參數操作…………………………………………………….40
4-2.2銲道熔池觀察…………………………………………………………..41
4-3後熔結果分析………………………………………………………………….44
4-3.1覆層金相分析…………………………………………………………..44
4-3.2 後熔層組織結構分析…………………………………………………46
4-3.3 掃瞄式電子顯微鏡(SEM)分析………………………………………..53
4-3.3 微硬度分析……………………………………………………………54
第五章 結論…………………………………………………………………………….55
第六章 未來研究方向………………………………………………………………….56
參考文獻………………………………………………………………………………...57

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