本研究使用GTAW(Gas Tungsten Arc Welding)將Alloy 82覆銲於316L SS基材上，以DL-EPR(Double Loop-Electrochemical Potentialkinetics Reactivation)評估覆銲層經固溶化處理(1050℃/0.5hr)及敏化處理(650℃/24hr)的抗腐蝕能力。再使用不同走速之LSM(Laser Surface Melting)技術進行敏化組織的修復，評估抗腐蝕能力回復的有效程度。實驗結果顯示，GTAW覆銲組織為柱狀枝晶，生成高比例的高角度(>15°)高能量晶界，富Nb、Ti之複合型析出物隨機散佈於枝晶間及晶界上且C、Nb及Ti沿枝晶間偏析，枝晶間Cr含量相較於基材明顯偏低，在腐蝕環境中容易產生孔蝕。固溶化熱處理後，能消除枝晶間偏析的現象，並使Cr重新分布，呈現均質的組織結構，即使再經敏化處理，抗腐蝕能力並未明顯改變。
GTAW覆銲經敏化熱處理後，富Cr碳化物沿晶界析出，經DL-EPR測試結果出現再活化陽極峰，確認已形成敏化組織，腐蝕機制為晶界腐蝕、枝晶間腐蝕及孔蝕。經LSM後富Cr碳化物完全固溶回基材，重熔區生成等軸及細柱狀枝晶，且C、Nb、Ti及Cr重新分布，經DL-EPR測試結果未出現再活化陽極峰，證實LSM能有效消除敏化組織並修復抗腐蝕能力。改變雷射走速研究結果顯示，隨雷射能量密度提高，可以產生較大的修復範圍。其中雷射走速0.8m/min之能量密度達34.2J/mm2，能完全固溶表面富Nb、Ti及富Cr析出物，產生高比例的低角度(<15°)低能量晶界，抑制溶質偏析及析出物沿晶界再度析出，修復及提升Alloy 82覆銲組織抗腐蝕的能力，是較理想的LSM參數。

Alloy 82 was over-welded on 316L SS substrates using gas tungsten arc welding (GTAW). The corrosion resistance of the over-welded layer was evaluated by double loop-electrochemical potentialkinetics reactivation test (DL-EPR) following solution annealing (1050°C/0.5hr) and sensitization treatment (650°C/24hr). The sensitized welds were repaired using Laser Surface Melting (LSM) at various speeds. The effective degree of corrosion resistance recovery was evaluated in every case. The experimental results showed that the GTAW over-welded structures consisted mainly of columnar dendrites with a high proportion of high-angle (>15°) high-energy grain boundaries. Nb- and Ti-rich composite precipitates were randomly dispersed between the interdendritc region and the grain boundaries. In addition, C, Nb and Ti segregation was observed along the dendrite boundaries. The Cr content between the interdendritc region was significantly lower than that of the substrate, and hence prompted pitting corrosion under corrosion testing. However, following solution annealing, the C, Nb and Ti segmentation between the the interdendritc region was eliminated, and the Cr was redistributed; resulting in a homogeneous microstructure. Even after sensitization, the corrosion resistance was not significantly changed. After GTAW over-welding and sensitization heat treatment, Cr-rich carbides precipitated along the grain boundaries. The DL-EPR test results showed that the anodic peaks were reactivated; confirming the formation of sensitized structures. The corrosion mechanism consisted of grain boundary corrosion, interdendritic corrosion, and pitting corrosion. Following LSM treatment, the Cr-rich carbides were completely re-dissolved back into the substrate. Moreover, a re-melted zone was formed with equiaxed and fine columnar dendrites and a homogeneous C, Nb, Ti and Cr distribution. The DL-EPR test results showed no reactivation of the anode peaks. Thus, it was confirmed that LSM can effectively eliminate sensitized structure and enhance the repair corrosion resistance. The size of the repair range increased with an increasing laser energy density. An energy density of 34.2 J/mm2 was sufficient to completely dissolve the surface-rich Nb, Ti and Cr-rich precipitates and produce a high proportion of low-angle (<15°) low-energy grain boundaries, thereby inhibiting the segregation of solute and the precipitation of precipitates along the grain boundaries. An energy density of 34.2 J/mm2 was thus found to be the ideal LSM energy density for repairing and improving the corrosion resistance of Alloy 82.

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