本文關(guān)鍵詞： 高溫合金 DD 定向凝固 單晶葉片 雜晶缺陷　出處：《鑄造》2017年05期 　論文類型：期刊論文

【摘要】：利用Bridgman定向凝固工藝進(jìn)行了高溫合金DD483單晶葉片鑄造試驗(yàn),通過調(diào)整抽拉速度和使用不同型殼材料研究了工藝條件對(duì)雜晶缺陷的影響。結(jié)果表明,葉片中的雜晶缺陷一般出現(xiàn)在橫截面突然擴(kuò)大的緣板部位。鑄件下部的外側(cè)比內(nèi)側(cè)更易生成雜晶,但在上部則相反,即鑄件內(nèi)側(cè)的雜晶缺陷更嚴(yán)重。在緣板部位降低抽拉速度能有效減少雜晶缺陷。在使用國(guó)產(chǎn)型殼時(shí)合金DD483葉片的單晶率非常低,但使用進(jìn)口的純剛玉型殼時(shí)葉片質(zhì)量有明顯提高,這說明型殼材料對(duì)單晶葉片中雜晶的形成有明顯影響。
[Abstract]:The casting experiment of superalloy DD483 single crystal blade was carried out by Bridgman directional solidification process. The effects of process conditions on the heterocrystalline defects were studied by adjusting the drawing speed and using different shell materials. The heterocrystalline defects in the blade are usually found in the edge plate where the cross section suddenly expands. The lower side of the casting is more likely to form heterocrystals than the inner part, but the opposite is true in the upper part. In other words, the inner side of the casting has more serious heterocrystalline defects. Reducing the drawing speed at the edge plate can effectively reduce the heterocrystalline defects. The single crystal rate of the alloy DD483 blade is very low when the domestic mold shell is used. However, the quality of the blade is improved obviously when the imported pure corundum shell is used, which indicates that the shell material has an obvious influence on the formation of heterocrystals in the single crystal blade.
【作者單位】： 東方電氣集團(tuán)東方汽輪機(jī)有限公司長(zhǎng)壽命高溫材料國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【分類號(hào)】：TG132.3;TG245
【正文快照】： 表1合金DD483的化學(xué)成分Table1 1 Nominal composition of alloy DD483 wB/%高溫合金葉片是航空發(fā)動(dòng)機(jī)和重型燃?xì)廨啓C(jī)最重要的核心部件,其晶體組織對(duì)使用性能有重要影響。隨著鑄造工藝的發(fā)展,葉片組織由原來的等軸晶改進(jìn)為柱狀晶,再優(yōu)化為單晶組織,消除了晶界,使整個(gè)葉片只由

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