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題 名 | Nd:YAG雷射重熔球墨鑄鐵表面放電合金化層之微結構及腐蝕特性探討=Microstructure and Corrosion Characteristics of Nd:YAG Laser Remelted Electrical Discharge Alloyed Layer on Spheroidal Graphite Cast Iron |
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作 者 | 林宏茂; 黃晨菘; 謝博奇; 程金保; | 書刊名 | 鑄造工程學刊 |
卷 期 | 40:1=160 2014.03[民103.03] |
頁 次 | 頁1-11 |
分類號 | 472.2 |
關鍵詞 | 表面改質; 放電合金化法; 脈衝式Nd:YAG雷射重熔; 球墨鑄鐵; 碳化物; Surface modification; Electrical discharge alloying; Pulsed Nd:YAG laser remelting; Spheroidal graphite cast iron; Carbide; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用放電合金化(electrical discharge alloying, EDA)製程結合脈衝式Nd:YAG雷射重熔(laser remelting, LR)進行鑄鐵表面改質,主要是針對模具用的球墨鑄鐵為基材,選擇容易形成硬脆相碳化物層之碳化物促進元素(鉻)作為電極材料。將純鉻電極材料之最佳參數放電合金化試片,利用經最佳化測試所得之脈衝式Nd:YAG雷射重熔條件加以表面改質,結果顯示純鉻電極經EDA試片的硬度值明顯優於經放電合金化後再雷射重熔(EDA+LR)的試片,但其雷射重熔層的缺陷明顯較放電合金化層為少。純鉻電極EDA及EDA+LR試片的抗蝕性均優於球墨鑄鐵基材。由改質層表面形貌觀察結果可知EDA改質層表面粗糙度明顯較EDA+LR試片的試片表面粗糙度差。X光繞射結果顯示鉻元素EDA層主要組成相為Cr_7C_3及Cr¬_3C_2,而EDA+LR改質層主要組成相為Cr_3C_2及Fe_3C。 |
英文摘要 | Electrical discharge alloying in combination with pulsed Nd:YAG laser remelting is the method intended for the surface modification of cast iron in this study. Spheroidal graphite cast iron for mold making was used as a base material while a carbide-forming element (Cr) that promotes the formation of hard and brittle carbide layers having good wear resistance was selected as electrode material. The test specimen that had undergone electrical discharge alloying with the optimal parameters were surface modified by pulsed Nd:YAG laser remelting under the conditions obtained through optimization testing. The results reveal that the specimens obtained from applying electrical discharge alloying (EDA) with the Cr electrodes have significantly higher hardness than those that received electrical discharge alloying and laser remelting (EDA+LR). However, the laser remelted layers have significantly less defects compared with the EDAed layers. The specimens obtained from applying electrical discharge alloying (EDA) with the Cr electrodes and the laser remelted specimens also exhibit better corrosion resistance compared to the base SG cast iron. Topographical observations of the surfaces of the modified layers reveal that the EDAed layers had significantly rougher surface than the laser remelted layers. The X-ray diffraction analysis shows that the main compositional phases in the EDA-ed layer with Cr are Cr_7C_3 and Cr_3C_2, while Cr_3C_2 and Fe_3C for the laser remelted layer. |
本系統中英文摘要資訊取自各篇刊載內容。