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    激光功率對CoNiCrAlY熔覆涂層顯微組織及硬度的影響
    Microstructure and Hardness of CoNiCrAlY Coatings on Titanium Alloy by Laser Cladding with Different Laser Power
    王濤,劉佳奇,秦令超
    點擊:5768次 下載:0次
    作者單位:中國民航大學航空工程學院
    中文關鍵字:激光功率; CoNiCrAlY涂層; 顯微組織; 顯微硬度; 結合區域
    英文關鍵字: laser power; CoNiCrAlY coating; microstructure; micro hardness; transition region
    中文摘要:利用激光熔覆技術在Inconel 718鎳合金基體上制備了CoNiCrAlY高溫防護涂層。采用掃描速度7 mm/s,光斑直徑4 mm,研究激光功率對CoNiCrAlY熔覆涂層宏觀形貌、截面組織以及顯微硬度的影響。實驗結果表明,在相同掃描速度和光斑直徑的條件下,熔覆層的宏觀形貌在激光功率1800 W質量最優,熔覆層表面連續且平整,波浪起伏較小;隨著激光功率的增加,激光能量增加,熔覆層的幾何尺寸增大;當激光功率1400 W時,氣體未完全逸出熔池就冷卻凝固,涂層頂部出現氣泡、孔隙等缺陷,當激光功率增加到2200 W時,不再出現明顯的氣泡和孔隙;隨著激光功率的增加,熔覆材料吸收的能量越來越多,導致晶粒長大,熔覆層呈現柱狀晶高度越來越大,樹枝晶越來越多而胞狀晶越來越少的組織形態。當激光功率為1800 W時,熔覆層整體形貌和組織的質量最好,熔覆層與基體結合緊密,沒有熔渣或孔隙,形成了性能良好的冶金結合,平均顯微硬度最高。
    英文摘要:To improve the high temperature resistance of Inconel 718 substrate, CoNiCrAlY coatings were fabricated by the laser cladding. The influences of laser power on surface morphology, microstructure of cross section and hardness of CoNiCrAlY coatings were investigated under the same scanning speed 7 mm/s and diameter of spot 4 mm. The results showed that under the laser power 1800 W, the macro-morphology of coating had the best quality, and the coatings were continuous and smooth with small waves. With the laser power going up, the geometry size of cross section of coatings increased gradually due to that laser energy are absorbed. Under the laser power 1400 W, the defects such as bubbles and pores appeared at the top of the cladding layer due to that the molten liquid was cooled and solidified before the inclusion gas were escaped. Under the laser power 2200 W, no longer appeared bubbles and pore. With the increase of laser power, the energy absorbed by the cladding layer increases, which leads to grain growth. Therefore, the columnar crystals at the cladding layer were higher, dendrites were more and cellular crystal less. Under the laser power 1800 W, the quality of the overall morphology and microstructure of the cladding layer was best and the average micro-hardness was most high. At the same time, the cladding layer and the substrate were closely bounded and formed a firm metallurgical combination with no slag and air voids.
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    主管單位:中國船舶重工集團公司  主辦單位:中國船舶重工集團公司熱加工工藝研究所中國造船工程學會船舶材料學術委員會
    開戶銀行:工商銀行陜西省興平市板橋支行  帳戶名:中國船舶重工集團公司第十二研究所  帳號:2604031909022100458
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