本研究主要以GTAW與LBW兩種製程對鎳基690合金進行平板對接銲，探討銲件殘留應力狀態與抗腐蝕能力，並由銲接入熱量、銲接熱循環歷程、溫度分布等因素分析造成兩者差異性之關係。實驗使用高速鑽孔法搭配應變規量測銲件殘留應力，並使用U-Bend應力腐蝕試驗評估兩種銲接製程銲件之抗腐蝕能力。
溫度量測實驗結果顯示，相較於GTAW製程，LBW有極高的加熱速率(3020˚C/sec)與冷卻速率(147~157˚C/sec)，其銲件熱影響區於冷卻通過敏化溫度區間經歷時間僅1.4~1.5秒，此有助於抑制晶界碳化鉻析出使銲件保持良好抗蝕能力。GTAW銲件銲接衰化區通過敏化溫度區間經歷時間超過17秒，沿晶界有碳化鉻連續狀態析出，導致銲件抗沿晶腐蝕能力下降。GTAW與LBW銲件在接近熔融線處皆有高拉伸殘留應力，LBW最大拉伸殘留應力高於GTAW銲件，其應力值接近材料降伏強度，推測為LBW較大的溫度梯度變化導致較高殘留應力。殘留應力隨著與熔融線距離增加而下降，LBW接續殘留拉應力區後有較明顯之殘留壓應力區。配合組織金相與殘留應力比較銲件腐蝕分佈狀態，結果顯示銲件組織變化還是影響銲件抗腐蝕能力的主因，殘留應力對腐蝕行為的影響不明顯。
關鍵字：鎳基690合金、惰性氣體鎢棒電弧銲接、雷射銲接、殘留應力、腐蝕

This study investigated the residual stress and corrosion resistance of Inconel 690 Alloy weldments by GTAW and Nd-YAG Laser Beam Welding processes. The residual stress of the weldments was measured by the high speed hold-drilling strain-gage method, and their corrosion resistance was evaluated by the U-Bend stress corrosion test.
The temperature measurements showed that LBW process resulted in much higher heating rate (3020˚C/sec) and cooling rate (147~157˚C/sec)of the weldment than GTAW process. Compared to the temperature observations in the heat affected zone of both weldments, it only took 1.4~1.5 seconds to pass through the sensitization range in the LBW weldment, whereas 17 seconds period was needed in the GTAW counterpart. The high cooling rate is favourable for depressing Cr-carbides precipitation along the grain boundary, and hence to improve the corrosion resistance of weldments. Moreover, high tensile residual stresses were observed near the fusion line of all specimens. The maximum residual stress of LBW weldment is higher than that of GTAW counterpart, which value approaches to the yielding strength of 690 alloy. This may be attribute to the high temperature gradient of the LBW process. The residual stresses decrease with increasing distance from the fusion line, and LBW specimen has a compressive residual stress zone clearly following the tensile residual stress zone. From the comparison with metallography, residual stress of weldments and the results of corrosion tests, it was found that the welding microstructure is a major factor to affect the corrosion resistance of weldments, whereas the welding residual stress didn’t show an obvious effect to it.
Keywords: Inconel 690 Alloy, GTAW, Laser Beam Welding, Residual Stress, Corrosion

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