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系統識別號 U0026-0812200912040504
論文名稱(中文) ASTM A533與A572異種母材銲接之銲接性質研究
論文名稱(英文) Characteristic Study of Dissimilar Welding of A533 to A572 Alloy
校院名稱 成功大學
系所名稱(中) 機械工程學系專班
系所名稱(英) Department of Mechanical Engineering (on the job class)
學年度 94
學期 2
出版年 95
研究生(中文) 賴振慶
研究生(英文) Chen-Ching Lai
電子信箱 fredlai98@seed.net.tw
學號 n1792106
學位類別 碩士
語文別 中文
論文頁數 106頁
口試委員 指導教授-李驊登
口試委員-郭聰源
口試委員-陳鐵城
中文關鍵字 A533  遮蔽金屬棒電弧銲接  熱影響區  裂紋  殘留應力 
英文關鍵字 Crack  Residual Stress  HAZ  SMAW  A533 
學科別分類
中文摘要 A533合金鋼為一種重要的核電廠之核能壓力容器鋼材,但使用上為了節省材料成本等因素,異種母材對接是常見的方法之一,而為了提升熱影響區(HAZ)的韌性,及降低銲接後之殘留應力值,實施銲後熱處理(PWHT)為重要的環節之一。本研究選用A533 TypeB Class2與A572 Grade 65鋼板,搭配遮蔽金屬棒電弧銲接(SMAW)製程進行銲接。SMAW製程採用AWS A5.5 E8016-G與E9016-G兩種銲條,對兩母材進行異材對接銲。並經不同溫度之PWHT條件,比較其銲件的顯微結構、機械性質及殘留應力值。
實驗結果顯示,兩銲件未經PWHT之銲件的粗晶熱影響區其硬度值高於熔融區。但兩銲件經不同溫度之PWHT後,使得銲道及熱影響區的硬度下降。各種銲後熱處理溫度下,所有試件斷裂位置皆偏於A533側之銲道與粗晶熱影響區交界處。此外,兩銲件的抗拉強度會隨銲後熱處理溫度的提高而呈現下降的趨勢。在各種PWHT溫度條件之拉伸試件斷口皆出現夾雜物及裂紋。經PWHT之兩試件之殘留應力,會隨著PWHT溫度的上升而有明顯下降趨勢。


英文摘要 The low alloy steel of A533 is widely used as pressure vessel plates in nuclear power plant. Where dissimilar butt welding is commenly employed with an aim to save cost. In order to improve the toughness of heat affected zone (HAZ), and reduce the residual stress, the Post weld Heat Treatment (PWHT) is one of the important process after welding. A533 TypeB Class2 and A572 Grade 65 steel plate were selected and welding was performed using the Shield Metal Arc Welding (SMAW) with two different filler rod materials of AWS A5.5 E8016-G and AWS A5.5 E9016-G. Influence of different PWHT temperature on the properties such as microstructure, mechanical property and residual stress were performed in this study.
The experimental results indicate, that the hardness of coarse grain area in heat affected zone is higher than the fusion zone of the welding without PWHT. Howeven, they all decreased with increasing PWHT temperature. All are ruptured in the fusion zone and coarse grain area in heat affected zone by specimens after PWHT by different temperature. The tensile strength of two dissimilar weldments(E80, E90) would decreased as the temperature of PWHT is raised. Inclusions and cracks were observed on the fractured tensile specimens. Increase the temperature of PWHT would cause the residual stress of two dissimilar weldments (E80, E90) to decreased and vanished throughly by 650℃ treatment.


論文目次 博碩士論文授權書 I
口試合格證書 II
摘 要 III
Abstract IV
誌 謝 V
總 目 錄 VI
圖 目 錄 IX
表 目 錄 XII
表 目 錄 XII
第一章 前言 1
第二章 相關理論背景 6
2.1 銲接 6
2.2 遮蔽金屬棒電弧銲接 9
2.3 銲接熱影響區組織及相變態 13
2.3.1 銲道 13
2.3.2 熱影響區 15
2.4 銲接殘留應力之形成 18
2.5殘留應力之應變規鑽孔量測方法 20
2.5.1應變規鑽孔法理論說明 20
2.5.2 ASTM E837規範 28
2.6 殘留應力與銲後熱處理 32
第三章 銲接材料與實驗方法步驟 33
3.1 實驗規劃 33
3.2實驗流程 35
3.2.1 實驗材料 35
3.2.2 材料成分之相關規格 36
3.2.3 銲條 39
3.2.4 SMAW銲接試驗 41
3.2.5 超音波與X-Ray檢驗 44
3.2.6 銲後熱處理試驗 45
3.3 試件製備與顯微分析 46
3.3.1 金相試件製備 46
3.3.2 高速鑽孔之殘留應力量測相關步驟 46
3.3.3 顯微分析 49
3.3.4 Rockwell硬度試驗 49
3.3.5 拉伸試驗 50
3.3.6 斷口形貌分析 51
3.4 實驗儀器與設備 52
第四章 實驗結果與討論 59
4.1金相組織觀察 59
4.1.1 A533與A572之母材金相組織 59
4.1.2 A533與A572對接銲金相組織 63
4.1.3銲後熱處理金相組織 74
4.2 Rockwell硬度分析 82
4.3拉伸性能分析 84
4.4 ESEM破斷面觀察 87
4.5殘留應力分析 93
第五章 結論 98
第六章 未來研究建議方向 100
參考文獻 101
著作權聲明 104
自 述 105

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