本研究主要是在探討鎳基690合金，在經過GTAW與LBW銲接製程後，銲件對於耐蝕性質以及抗應力腐蝕的影響，從銲接熱循環歷程、溫度分布及材料敏化等因素來探討銲接製程對於兩者所造成的影響。實驗方面使用化學試驗法及電化學試驗法來探討材料耐蝕性的差異，使用慢應變速率拉伸試驗來評估銲件抗應力腐蝕破壞的能力。
銲接過程溫度量測結果顯示，相較於GTAW製程，LBW有極高的加熱速率(3309˚C/sec)與冷卻速率(90~157˚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1.5~1.9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銲件通過敏化溫度區間經歷時間超過19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形成銲接衰化區。鎳基690合金經GTAW與LBW後之銲件，在銲道及銲接衰化區皆造成耐蝕性的降低，LBW銲件在腐蝕初期造成銲道微量枝晶間腐蝕，以及銲接衰化區的沿晶腐蝕，其腐蝕情況並不隨時間增加而加深；GTAW銲件在銲道及銲接衰化區的腐蝕情形會隨著時間增加而加深。電化學試驗在極化曲線量測，鎳基690合金經過銲接後之銲件，其鈍態電流密度皆有升高趨勢，而GTAW所造成的影響較LBW明顯；在雙環動電位再活化法則顯示，GTAW銲件的衰化區有沿晶腐蝕的發生，明顯顯示鎳基690合金之GTAW製程敏化現象較嚴重。慢應變速率拉伸試驗結果，LBW銲件之銲道強度高於母材，且於銲接衰化區所造成之沿晶腐蝕並未因拉伸造成開裂；GTAW銲件的銲道沿晶腐蝕導致斷裂提早發生，且在銲接衰化區的沿晶腐蝕明顯拉伸造成開裂情形，仍有在此區域發生沿晶應力腐蝕破壞的可能。

This research mainly focuses on the effect on corrosion resistance and stress corrosion resistance of Inconel 690 Alloy after Inert Gas Tungsten Arc Welding（GATW） and Laser Beam Welding（LBW） process. The effect on both characteristic caused by variables such as measurement of welding heat cycle and sensitization was discussed. Modified Huey’s test and electrochemical test were used in experiment in order to probe into the difference of corrosion resistance. Meanwhile, slow strain rate test（SSRT） was used to evaluate stress corrosion cracking（SCC） resistance of weldment by GTAW and LBW processes.
The temperature measurements showed that the heating rate (3309˚C/sec) and cooling rate (90~157˚C/sec) of the weldment in LBW process were much higher than in GTAW process. During cooling procedure the LBW process, it only took 1.5~1.9 seconds for the LBW weldment to pass through the sensitization range which is much shorter than the 19 seconds needed in GTAW process. The high cooling rate is favorable for depressing Cr-carbides precipitation along the grain boundary which improves the corrosion resistance of weldments. The corrosion resistances of fusion zone and weld decay zone have all decreased after GTAW and LBW process. LBW weldment will cause less corrosion in fusion zone and intergranular corrosion cracking（IGC） in weld decay zone during the early stage of corrosion, the state of corrosion will not worsen in time; On the contrary, the state of corrosion in fusion zone and weld decay zone will worsen as the time duration increases. Polarization of weldments by GTAW and LBW processes both of their current density for passivation increased. The effect caused by GTAW process is more obvious than which caused by LBW. The result of double-loop electrochemical potentiokinetic reactivation（DL-EPR）showed that IGC has occurred in the weld decay zone of GTAW weldment. The result of SSRT showed that the tensile strength in fusion zone of LBW weldment is higher than base metal, and the IGC in weld decay zone did not crack because of the stretch；IGC in fusion zone of GTAW weldment leads to early fracture, and the IGC in weld decay zone clearly stretched and cause the material to crack. Intergranular stress corrosion cracking（IGSCC） in this section is still possible.

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