本文關(guān)鍵詞： 選擇性激光燒結(jié)(SLS) 碳纖維 覆膜砂 真空差壓鑄造 ZL205A　出處：《南昌航空大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：選擇性激光燒結(jié)(SLS)覆膜砂型技術(shù)與真空差壓鑄造相結(jié)合,可快速鑄造無(wú)余量、復(fù)雜薄壁精密鑄件。通過將碳纖維加入覆膜砂,改善SLS覆膜砂型強(qiáng)度和導(dǎo)熱性,在航空航天及國(guó)防領(lǐng)域中成形復(fù)雜薄壁件有極大優(yōu)勢(shì)。研究碳纖維含量對(duì)SLS覆膜砂型真空差壓鑄造鋁合金組織及性能影響,為SLS覆膜砂型真空差壓鑄造鋁合金奠定理論和技術(shù)支撐。本文以ZL205A鋁合金為研究對(duì)象,通過將不同含量的碳纖維加入覆膜砂型,采用真空差壓鑄造成形ZL205A合金,研究碳纖維含量對(duì)ZL205A合金組織致密度、微觀組織、機(jī)械性能的影響規(guī)律。實(shí)驗(yàn)結(jié)果表明,碳纖維含量對(duì)SLS覆膜砂型真空差壓鑄造鋁合金組織及性能影響顯著,當(dāng)碳纖維含量小于3wt%時(shí),隨著碳纖維含量的增加,ZL205A致密度變大,微觀組織變細(xì)小,抗拉強(qiáng)度和延伸率上升;當(dāng)碳纖維含量超過3wt%時(shí),致密度下降,微觀組織變粗大,抗拉強(qiáng)度和延伸率下降;當(dāng)碳纖維含量相同時(shí),壁厚越大,致密度越高,強(qiáng)度降低,晶粒尺寸逐漸增大,微觀組織形貌基本相同,均為等軸晶;隨著試樣部位從近橫澆道部位到頂部,致密度先減小后增大,呈V型變化趨勢(shì),且近澆道部位達(dá)到峰值,隨著碳纖維含量的增加,V型變化逐漸顯著;當(dāng)碳纖維含量為3wt%、壁厚為3mm時(shí),晶粒尺寸最小38μm,抗拉強(qiáng)度和延伸率達(dá)到峰值,分別為496.42MPa和延伸率為10.23%。通過將碳纖維加入SLS覆膜砂型,研究獲得碳纖維含量對(duì)真空差壓鑄造ZL205A鋁合金組織及性能的影響規(guī)律,為SLS覆膜砂鑄型真空差壓成形復(fù)雜薄壁件鋁合金鑄件提供一定的理論依據(jù)和實(shí)際應(yīng)用價(jià)值。
[Abstract]:Selective laser sintering (SLS) film coated sand mold technology combined with vacuum differential pressure casting (DPC) can be used for rapid casting of complex thin wall precision castings without allowance. Carbon fiber is added into coated sand. Improve the strength and thermal conductivity of SLS coated sand mold. The influence of carbon fiber content on the microstructure and properties of SLS coated sand mold by vacuum differential pressure casting is studied. For SLS film coated sand mold vacuum differential pressure casting aluminum alloy theoretical and technical support. This paper takes ZL205A aluminum alloy as the research object, by adding different content of carbon fiber coated sand mold. The effect of carbon fiber content on the microstructure density, microstructure and mechanical properties of ZL205A alloy was studied by vacuum differential pressure casting. The experimental results showed that the effect of carbon fiber content on the microstructure, microstructure and mechanical properties of ZL205A alloy was studied. The effect of carbon fiber content on the microstructure and properties of SLS coated sand mold by vacuum differential pressure casting is significant. When the carbon fiber content is less than 3 wt%, the density of ZL205A increases with the increase of carbon fiber content. The microstructure became smaller and the tensile strength and elongation increased. When the carbon fiber content is more than 3wt%, the density decreases, the microstructure becomes thicker, and the tensile strength and elongation decrease. When the content of carbon fiber is the same, the larger the wall thickness, the higher the density, the lower the strength, the larger the grain size, and the more uniform the microstructure is. With the sample position from the near transprue to the top, the density decreases first and then increases, and the near runner reaches the peak value. With the increase of carbon fiber content, the V-type changes gradually. When the carbon fiber content is 3wt and the wall thickness is 3mm, the grain size is minimum 38 渭 m, and the tensile strength and elongation reach the peak value. The results were as follows: 496.42 MPA and 10.23 respectively. Carbon fiber was added into SLS coated sand mold. The effect of carbon fiber content on the microstructure and properties of vacuum differential pressure casting (VDPC) ZL205A aluminum alloy was studied. It provides certain theoretical basis and practical application value for aluminum alloy castings of complex thin-walled parts formed by vacuum differential pressure forming of SLS coated sand mold.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG292;TB33

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