304不锈钢之Stellite6转移式电浆电弧被覆层微观组织特性探讨-YOKE.PDFVIP

304 不銹鋼之 Stellite 6轉移式電漿電弧被覆層微觀組織特性探討 Microstructural Characterization of Plasma Transferred Arc Overlaying Stellite 6 Coatings on 304 Stainless Steel a,＊ b c 林宏茂 呂傳盛 林英捷 a遠東科技大學 機械工程系 b 國立成功大學 材料科學及工程學系 c 國立台灣師範大學工業教育學系 Hung-Mao Lina, ＊, Truan-Sheng Luib aDepartment of Mechanical Engineering, Far East University bDepartment of Materials Science and Engineering, National Cheng Kung University 摘要 本研究係利用轉移式電漿電弧設備，於 304 不銹鋼被覆一層 Stellite合金。 藉由被覆條件的改變 (被覆電流、粉末流量及走行速度 ) ，用以探討其對於被覆層 及界面區影微觀組織及結合強度之影響。實驗結果顯示以轉移式電漿被覆 Stellite 6合金於 304 不銹鋼基材上，其被覆層皆為樹枝狀晶組織。且隨著被覆電流增加， 被覆層之樹枝狀晶組織有粗大化的現象。此外，被覆層的稀釋率有隨著走行速度 及粉末流量的降低而有明顯增加的趨勢。而隨著被覆電流增加，被覆層硬度明顯 降低。被覆層至界面的橫截面凝固組織可知其分別為樹狀晶、胞狀晶及平面成長 層。由被覆層至母材之橫截面硬度分佈值顯示，於平面成長層硬度值急遽下降。 被覆試片之結合強度試驗結果顯示低被覆電流 (70A~90A)試片，其破壞發生於被 覆層上。但高被覆電流 (110A)試片，卻於界面區域產生破壞。 Abstract In this study, Stellite 6 coating is overlaid on 304 stainless steel with a plasma transferred arc (PTA) equipment. The effect of the overlayer on the microstructure and bounding strength of the overlayer and the interface region is investigated by changing the overlaying conditions (overlaying current, powder rate and travel speed). Experiment results show that all the Stellite 6 overlayer placed on 304 stainless steel with the use of PTA has a dendritic structure. Also, the dendritic structure of the overlayer becomes coarse following the increase in the overlaying current. In addition, the dilution rate of the overlayer shows a tendency to markedly increase following the decrease in the travel speed and the powder rate. Following the increase in the overlaying current, the hardness