Selected Article



The Wear of 420 Stainless Steel Remelting Layers


[[abstract]]本研究之目的在於利用火燄噴覆技術,噴覆打底層(Ni粉、Ni-Cr粉),再噴覆420不銹鋼於S45C基材上,然後搭配氬銲與雷射後熔處理,以獲得品質極佳之後熔層,最後再進行乾砂式磨耗試驗以評估覆層的耐磨耗性,以決定出此製程之最佳參數。 實驗結果顯示:在氬銲後熔方面,銲接電流為80A,起弧電壓14V,走速1.25cm/min,氬氣流量為16~20L/min,可獲得良好的後熔表面;雷射後熔製程方面,固定雷射功率1600W,走速100mm/min,可成功地完成雷射後熔。 由金相分析比較中可以發現兩種不同後熔方式所得到的結構有所差異,氬銲後熔在覆層的晶粒為粗大的柱狀晶,熱影響區中包含了粗晶區與細晶區;雷射後熔在覆層與熱影響區中為細微的柱狀晶、樹狀晶與針狀組織。 在抗磨耗性方面,氬銲後熔Ni-Cr打底層之重量損失量最少,其次為雷射後熔Ni打底層的試片,損失最多為氬銲後熔的Ni打底層。

[[abstract]]Abstract The main purpose of this study is used flame spraying technology, to clad 420 stainless steel layer on S45C substrate. Mean while Ni or Ni-Cr powder was chosen as bond coat. Then the green layers were post remelted by TIG or laser method. To obtain the high quality layers, last to proceed dry sand abrasion test, to estimate the wear-resisting of remelted layer, to decide the best parameters in these methods. The results were revealed in this study:Remelting by TIG method, with welding current 80A, moving speed 12.5mm/min, and shielding gas 16~20L/min, can obtain fine surface. Remelting by laser method, working power 1600W, moving speed 100mm/min, could successfully achieve remelting process. From the microstructure analysis, the different microstructures were detected by two different remelting methods. Remelting by TIG method, dendrites were formed in thecoating, the heat-affected zone(HAZ) contain coarse grain zone and fine grain zone ; Remelting by laser method, fine column grain and dendrites and needle structure was observed. The weight loss of wear-resisting test, remelting by TIG method, Ni-Cr bond coat has least, the next for remelting by laser method, Ni bond coat, the weight loss has miximun that remelting by TIG method, Ni bond coat. Keywords: wear、laser remelting、TIG remelting、flame spraying

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