本研究以惰性氣體鎢極電弧銲接(GTAW)將Inconel 52M被覆於SUS316L上，研究在不同冷卻速率下，母材與被覆層間的微觀組織、機械與腐蝕性質之差異，作為未來核電廠銲補管件時參考用。
實驗結果顯示，在稀釋率方面，有水冷卻對母材的稀釋率較無水冷卻時低。在金相觀察方面，有水冷卻時銲接試片之銲道晶粒大小較無水冷卻小，導致強度硬度之提升。在拉伸試驗方面，發現有水冷卻時破斷位置在母材處，而無水冷卻時是在銲道內，表示有水冷卻之銲件具有較高的抗拉強度。在抗蝕性方面，由於有水冷卻時之冷卻速率快、晶粒小、晶界面積較大，且因晶界為一缺陷，附近能量較高，較易與電解液中的離子反應，而造成抗蝕性較無水冷卻低。

This study is to investigate the influence of cooling condition Inconel 52M for cladding SUS 316L on mechanical and corrosion properties by Gas Tungsten Arc Welding. It could be observed that the microstructure of the region between base and filler metal and the properties of mechanical and corrosion which can serve as a reference for further welding for nuclear power plant in the future.
The results show that welding with water cooling backing has lower dilution ratio of matrix than without water cooling backing. It could be observed that the grain size of weld zone with water cooling backing was smaller than that without water cooling backing by using microscope. This phenomenon promoted the hardness of weld zone. In tensile test, the crack of weldment with water backing appeared in matrix. On the other hand, the crack of weldment without water cooling backing was observed in the weld zone. These phenomena implied that the weldment with water cooling backing has higher tensile strength than that without water cooling backing. In electrochemical test, the corrosion resistance of weldment with water cooling backing was lower than that without water cooling backing. Because of grain boundary is one kind of defects, which increases the free energy. These would led more ion to react with grain boundary and decreased the corrosion resistance.

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