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。

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.

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