臺灣博碩士論文加值系統

本研究主要以鈹銅合金與肥粒鐵系不銹鋼進行微弧氬銲銲接合後的顯微組織及機械性質的影響。本實驗固定電流、惰性氣體流量、銲接速度及電弧長度，以改變超音波震盪輸出功率為主要參數，實驗結果顯示，其顯微組織觀察發現，在銲縫金屬中生成Fe-Cu的化合物，且未導入超音波震盪之銲件，在銲縫金屬與熱影響區沒有析出物。導入超音波震盪之銲件，在銲縫金屬與熱影響區中觀察到有不同直徑大小的球形富(Fe-Cr)σ相析出物。在超音波輸出功率55W的條件下，銲件是有較高的硬度值與較高的拉伸強度，但其延展性會下降，以上實驗結果與富(Fe-Cr)σ相析出行為有密切關係。

In this paper, beryllium copper alloy and ferritic stainless steel were welded by micro-gas tungsten arc welding. The working ranges of welding parameters were fixed by conducting trial runs and satisfactory results obtained were used to conduct an experimental study.
Experiments were conducted applying ultrasonic vibration during the arc welding process and their effects on microstructure and mechanical properties of welds were presented. The observations of microstructure revealed that Fe-Cu compound in the weld metal was confirmed and no precipitation was recorded in weld metal or heat-affected zone. Spherical Fe-Cr sigma-phase precipitates of different diameters were observed in weld metal and heat-affected zone under ultrasonic vibratory condition.
The weld joints fabricated with ultrasonic output power 55W condition were found to possess comparatively high hardness value and high ultimate tensile strength, but loss in the ductility. These results were closely associated with the precipitation behavior of sigma-phase.

摘要......i
Abstract......ii
誌謝......iv
目錄......v
表目錄......ix
圖目錄......x
第一章 緒論......1
1.1 前言......1
1.2 研究動機與目的......2
第二章 文獻回顧......4
2.1 不銹鋼概論......4
2.1.1 不銹鋼種類......5
2.1.2 肥粒鐵系不銹鋼......6
2.1.3 肥粒鐵不銹鋼之球狀σ相析出行為......10
2.1.4 肥粒鐵不銹鋼之熱處理及應用......11
2.2 銅與鈹銅合金......15
2.2.1 鈹銅合金類別......17
2.3 薄板微氬銲接合的應用......20
2.4 保護氣體鎢電極電弧銲接法......21
2.4.1 GTAW銲接電流之性質......22
2.4.2 銲接參數......24
2.5 偏弧理論......25
2.6 凝固理論......27
2.6.1 銲接過程中晶核形成機制......30
2.6.2 晶粒細化機制......31
2.7 超音波震動銲接......32
2.7.1 超音波震動銲接理論......32
2.7.2 超音波空化效應理論......33
2.7.3 影響超音波空化的因素......34
2.8 震動銲接技術......35
2.9 國內外相關之研究......35
第三章 實驗方法......38
3.1 實驗流程......38
3.2 實驗材料前處理......39
3.3 變頻直流微弧氬銲製程參數及微氬銲精密治具測試......40
3.4 超音波震盪裝置......43
3.5 微硬度試驗......43
3.6 金相顯微組織觀察......44
3.7 SEM及EDS觀察與分析......46
3.8 X光繞射儀......47
3.9 拉伸試驗......48
第四章 結果與討論......49
4.1 異質銲道實驗結果分析......49
4.1.1異質銲道試片外觀及參數之分析......49
4.1.2銲接速度對銲接品質之影響......49
4.1.3電流對銲接品質之影響......51
4.1.4保護氣體流量對於銲道品質之影響......54
4.1.5銲接極性影響......56
4.2顯微組織分析......57
4.2.1 母材金相組織分析......57
4.2.2 未導入超音震盪之銲道......58
4.2.3 導入超音波震盪之銲道......59
4.3 X-Ray繞射分析......67
4.4 SEM及EDS成分分析......69
4.5 微硬度分析......75
4.6 拉伸試驗......78
4.6.1 拉伸性質分析......78
4.6.2 拉伸破斷面SEM分析......80
第五章 結論......83
參考文獻......84
Extended Abstract......89
簡歷(CV)......94

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