本研究使用AISI 309L為銲料，利用鎢極氣體保護電弧銲(GTAW)進行AISI 1015低碳鋼與AISI 304不銹鋼異質銲接，將銲接部位熱浸鍍純鋁後於750oC空氣氣氛進行高溫氧化。此外，藉由ANSYS模擬銲接試片於高溫環境的熱應力分佈情況，再將實驗結果與熱應力模擬結果進行比對，分析熱應力對鋁化層的破壞行為。結果顯示，鋁化層於750 oC高溫擴散後因銲接材料的熱膨脹係數差異，導致試片內於升溫過程產生熱應力，使低碳鋼熔融區(FZL)上介金屬層產生升溫裂紋，並在短時間高溫擴散後即剝離。在高溫持溫擴散過程中，鋁化層內Kirkendall孔洞與升溫裂紋開始成長且Kirkendall孔洞逐漸聚集，直至孔洞與裂紋連接形成連續裂縫，導致低碳鋼熱影響區(HAZL)鋁化層剝離。

Gas tungsten arc welding (GTAW)was applied to join AISI 304 stainless steel and AISI 1015 carbon steel with consumable – AISI 309L stainless steel wires. The oxidation test was performed by placing weldments at 750 ℃ after hot-dip pure aluminum. Welded specimen’s thermal stress distribution under high-temperature environment was simulated by ANSYS.The experimental results are compared with the results of simulation and determine the damage of intermetallic scale. The result shows that because of the thermal expansion coefficient difference between welded materials, causes thermal stress to occur during heating process , and heating cracks inside the scale above the Fusion zone of Low carbon steel(FZL).The aluminide scale will Strip after High-temperature diffusion in a short time. The Kirkendall voids and heating cracks inside the aluminide layer grows during the high temperature diffusion. The voids inside the aluminum layer will congest, until the holes were connected with cracks to form a continuous cracks and cause aluminide scale on HAZL to peel off.

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