本文主要探討不同合金元素種類與數目對於AISI 1050中碳鋼表面被覆多元合金被覆層之顯微結構與磨耗行為的影響。並找出影響耐磨耗能力的主要關鍵，以作為AISI 1050中碳鋼被覆多元合金的依據。

實驗結果顯示，這四種多元合金被覆層(NiCrCoAlTi、NiCrCoAl
TiSi、NiCrCoAlTiW、NiCrCoAlTiMo)均會在基地臨場(in-situ)合成TiC碳化物。而NiCrCoAlTi被覆層內，基地則有條狀結構的形成；添加矽元素後，會從基地內晶出葉脈狀強化相；添加鎢和鉬元素後，均會在晶界中發現共晶的強化相。

磨耗實驗結果發現，NiCrCoAlTi被覆層和添加Si、W、Mo的NiCrCoAlTi被覆層均可以有效地改善中碳鋼的耐磨耗能力。其中以NiCrCoAlTiSi被覆層的耐磨耗性為佳，這是因為NiCrCoAlTiSi被覆層內存在有機械互鎖能力較佳的葉脈狀強化相，使其可有效的保護摩擦表面，導致耐磨耗能力上升。

In this thesis, different multicomponent alloys were cladded on the surface of AISI 1050 steel by gas tungsten arc welding (GTAW). The microstructure and tribological properties of the cladding layers were investigated. Additionally, the major factors that influence wear performance of the clad layers were found out.
Experimental results show that the TiC particles are synthesized in-situ in the NiCrCoAlTi, NiCrCoAlTiSi, NiCrCoAlTiW and NiCrCoAlTiMo multicomponent clad layers. The matrix of NiCrCoAlTi clad layer comprises a strip structure. The addition of Si element results in the appearance of vein-shaped reinforcement in the matrix. The additions of W and Mo elements result in the formation of the eutectic precipitate in the grain boundary
The wear test results indicate that the wear performance of all multicomponent clad layers exceeds that of the AISI 1050 steel. The vein-shaped reinforcement in the NiCrCoAlTiSi clad layer provides strong mechanical interlocking, which can protect the rubbing surface. Hence, the NiCrCoAlTiSi clad layer has superior wear performance than the others.

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