發(fā)布時(shí)間：2018-11-21 15:14

【摘要】：采用單輥急冷技術(shù)研究了Fe_(67.5)Al_(22.8)Nb_(9.7)三元合金的快速凝固和組織形成規(guī)律。當(dāng)輥速?gòu)?0 m/s增大到40 m/s時(shí),合金條帶厚度減少1個(gè)數(shù)量級(jí),冷速增加了7倍;輥速為40 m/s時(shí)樣品形狀除規(guī)則條帶外還出現(xiàn)了魚(yú)骨狀條帶和球狀液滴。合金顯微組織由Nb(Fe,Al)_2和a-Fe組成,隨著輥速增大,凝固組織特征發(fā)生變化并且顯著細(xì)化。隨著輥速的增大,合金條帶近自由面凝固組織則由初生a-Fe相和層片共晶向碎斷層片共晶轉(zhuǎn)變,近輥面凝固組織始終由不規(guī)則共晶組成。輥速達(dá)到40 m/s時(shí),規(guī)則條帶完全由不規(guī)則共晶組成;合金液滴由于獲得的冷速相對(duì)較低,其凝固組織主要由初生a-Fe相和層片共晶組成,且隨著液滴直徑的減小初生相由樹(shù)枝晶向等軸晶轉(zhuǎn)變。
[Abstract]:The rapid solidification and microstructure formation of Fe_ (67.5) Al_ (22.8) Nb_ (9.7) ternary alloy were studied by single roll quenching technique. When the roll speed increases from 10 m / s to 40 m / s, the thickness of the alloy strip decreases by 1 order of magnitude, and the cooling rate increases 7 times. When the roll speed is 40 m / s, the shape of the sample is not only the regular strip, but also the fishbone strip and the spherical droplet. The microstructure of the alloy is composed of Nb (Fe,Al) _ 2 and a-Fe. With the increase of roll speed, the solidification microstructure changes and refines remarkably. With the increase of roll speed, the solidification structure of alloy strip near free surface changes from primary a-Fe phase and lamellar eutectic to broken fault eutectic, and the solidification microstructure of near roll surface is always composed of irregular eutectic. When the roll speed reaches 40 m / s, the regular band is composed of irregular eutectic completely. The solidification structure of alloy droplets is mainly composed of primary a-Fe phase and lamellar eutectic due to the relatively low cooling rate obtained, and the primary phase changes from dendrite to equiaxed crystal with the decrease of droplet diameter.
【作者單位】： 西北工業(yè)大學(xué)應(yīng)用物理系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目Nos.51327901;U1660108;51301138 航空科學(xué)基金項(xiàng)目No.2014ZF53069 陜西省科學(xué)技術(shù)研究發(fā)展計(jì)劃工業(yè)科技攻關(guān)項(xiàng)目No.2016GY-247 西北工業(yè)大學(xué)基礎(chǔ)研究基金項(xiàng)目No.3102015ZY077~~
【分類號(hào)】：TG111.4

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