本研究針對核電廠反應爐構件中出現龜裂之鎳基600合金與SUS 308不銹鋼的異材銲接處，以耐蝕性更佳、鉻含量更高之鎳基690合金取代鎳基600合金，以及以低碳含量之SUS 304L不銹鋼取代308不銹鋼，配合具高能量密度與低總入熱量特性的電子束銲接製程(EBW)，探討鎳基690合金與SUS 304L不銹鋼異種金屬銲件之製程參數與微結構組織及耐蝕性的關連性，以及銲件在空氣中與腐蝕介質環境中之耐蝕能力、機械性能與破斷行為，並與氬銲(GTAW)的銲件進行微結構與耐腐蝕能力比較。
EBW銲道經顯微分析、機械性質、與耐腐蝕能力測試，實驗結果顯示EBW銲道枝晶間出現以TiN與富Cr-Ni相為主之析出物，而富Cr-Ni相則出現在TiN周圍。TiN來自於690合金母材，而富Cr-Ni相則為新形成之析出物。經modified Huey試驗後之顯微分析發現TiN析出物/基地介面和富Cr-Ni相析出物/基地介面提供優先孔蝕起始的地點。與GTAW銲道比較，EBW銲道晶界因受快速凝固作用，抑制碳化鉻的析出，無缺鉻區的生成，其銲道枝晶間析出物不但較小、較少且晶界Cr含量較高，耐沿晶腐蝕能力與抗枝晶間腐蝕能力亦明顯較優。在0.01M Na2S2O3 + 1wt-% NaCl 溶液環境中，因出現孔蝕，使得銲件加速腐蝕破壞，造成抗拉強度與總沿伸率明顯較在空氣中之試件為低。斷口分析結果顯示銲件斷裂在空氣介質中為延性韌窩破斷模式，在腐蝕介質環境中則為延性韌窩破斷與腐蝕斷裂混合模式。
改變束偏量的研究結果顯示，當束偏量值在0～0.30mm之間時，雖抗拉強度值只有些微下降，但modified Huey試驗結果顯示，隨束偏量的增加，因銲道內Cr含量增加，使得抗枝晶間腐蝕能力隨之大幅提高；在0.01M Na2S2O3 + 1wt-% NaCl 溶液中之動電位極化測試結果發現，隨束偏量的增加，因銲道內Cr含量增加，造成銲道孔蝕起始電位值由385mVSCE (束偏量=0mm)提高到1050mVSCE (束偏量=0.30mm)，顯示抗孔蝕性能亦大為增強。在提升銲件耐蝕性與兼顧機械性能下，束偏量為0.30mm是較佳之銲接製程參數。

Many of the components deployed in nuclear reactor power plants are fabricated via the dissimilar welding of Alloy 600 and SUS 308 stainless steel (SS). However, maintenance records reveal that such components are prone to cracking during their service lives. The dissertation aims to resolve this problem by replacing these materials with higher Cr contented Alloy 690 and lower C contented SUS 304L SS. Morever, Alloy 690-SUS 304L SS weldments were jointed by means of electron beam welding（EBW） technique, which has a far higher energy density than traditional gas tungsten arc welding （GTAW） process. The interrelationships among the welding parameters, microstructure, corrosion resistance, mechanical properties and fracture behaviours of Alloy 690–SUS 304L SS EBW weldments were systematically examined in this study for comparing with those of the counterparts formed using a traditional GTAW process.
The experimental results reveal that the interdendritic regions of the fusion zones（FZs）of the EBW weldments contain fine TiN precipitates and Cr-Ni rich phases. The former originate from the Alloy 690 base metal（BM）, while the latter are new phases which precipitate around the TiN particles during the solidification process. Microscopic analysis of the weldments following a modified Huey test indicates that the matrix regions around the TiN precipitates and Cr-Ni rich phases represent preferential sites for corrosion pit initiation. Compared with the FZ formed in the GTAW process, the FZ in the EBW weldments solidifies more rapidly. This not only helps to suppress the precipitation of chromium carbide in the FZ, but also minimizes chromium depletion at the grain boundaries. Furthermore, it is found that fewer interdendritic precipitates are formed in the FZ of the EBW weldments than in that of the GTAW weldments. This phenomenon, coupled with the higher chromium content at the grain boundaries in the EBW specimens, causes the FZs of the EBW specimens to have significantly higher intergranular and interdendritic corrosion resistance properties than their GTAW counterparts. The fracture tests indicate that all of the EBW specimens rupture in the FZ during slow strain rate tests (SSRTs), irrespective of the test environment. However, the tensile strength and total tensile elongation of the specimens deformed in the 0.01M Na2S2O3 + 1wt-% NaCl corrosive environment are lower than those of the specimens deformed in air as a combined result of pitting corrosion in the FZ and corrosion-assisted cracking. Fractographic analysis reveals that the fracture surfaces of the specimens tested in air are characterized by a dimple-like structure, which is indicative of a ductile failure mode. By contrast, those of the specimens tested in a corrosive environment contain both a dimple-like structure and corrosive formations, which are thought to accelerate crack initiation and propagation, thereby leading to the premature failure of the specimen.
It is found that the tensile strength of the weldment reduces slightly as the beam offset（BOF）is increased from 0 to 0.30 mm. However, the chromium content in the FZ increases, and hence the interdendritic corrosion resistance of the weldment is improved. Furthermore, potentiodynamic polarization tests performed using a 0.01M Na2S2O3 + 1wt-% NaCl solution show that the pit nucleation potential (Enp) increases from 385 mVSCE in the FZ of the weldment fabricated using a BOF of 0.00 mm to 1050 mVSCE in that formed using a BOF of 0.30 mm. The higher value of Enp implies that the FZ has an improved pitting corrosion resistance. It is thought that this enhanced corrosion resistance is the result of a higher chromium content in the FZ. Overall, the results demonstrate that when fabricating Alloy 690-SUS 304L SS dissimilar weldments using the EBW technique, a BOF setting of 0.3 mm represents the optimal processing condition in terms of maximizing the corrosion resistance and mechanical properties of the weldment.

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