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V-5Cr-5Ti合金鑄態(tài)組織中的第二相行為研究
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北京有色金屬研究總院粉末冶金及特種材料研究所,北京有色金屬研究總院粉末冶金及特種材料研究所,北京有色金屬研究總院粉末冶金及特種材料研究所

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TG 146.4 TG 113.13

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Research of the Secondary Phase Behavior of As-cast V-5Cr-5Ti Alloy
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Powder Metallurgy and Special Materials Research Department, General Research Institute for Non-ferrous Metals,Powder Metallurgy and Special Materials Research Department, General Research Institute for Non-ferrous Metals,Powder Metallurgy and Special Materials Research Department, General Research Institute for Non-ferrous Metals

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    摘要:

    采用XRD、OM、SEM和TEM對V-5Cr-5Ti合金鑄態(tài)組織結(jié)構(gòu)進(jìn)行分析。結(jié)果表明： 采用真空電子束熔煉制備的V-5Cr-5Ti合金鑄態(tài)組織具有粗大的晶粒，晶粒內(nèi)部存在以層狀第二相堆垛成樹枝狀為特征的成分偏析區(qū)；金屬釩和鑄態(tài)V-5Cr-5Ti合金的晶格常數(shù)分別為0.30316nm和0.30375nm，V的單胞體積膨脹約0.58%；存在兩種類型的第二相：1）短條狀第二相，具有FCC結(jié)構(gòu)，晶格常數(shù)為0.4182~0.4228nm；2）橢圓狀第二相，具有FCC結(jié)構(gòu)，晶格常數(shù)為0.4186~0.4242nm；V-5Cr-5Ti合金凝固過程中，首先Ti元素與C元素反應(yīng)析出具有立方結(jié)構(gòu)的亞穩(wěn)間隙相（Ti2C）或V元素與C元素反應(yīng)析出具有HCP結(jié)構(gòu)的亞穩(wěn)間隙相（V2C），隨后原子發(fā)生相互取代，最終形成以Ti元素為主，V、Cr元素為輔，具有FCC結(jié)構(gòu)的碳-氧-氮化物，化學(xué)式記為(Ti2-CON)。

    Abstract:

    The as-cast state microstructure was analyzed by XRD、OM、SEM and TEM. The results show that V-5Cr-5Ti alloy was fabricated by vacuum electron-beam melting ,it has coarse grain, the grain has the characteristics of dendritic crystal made by lamellar secondary phase. The lattice parameters of metal vanadium and V-5Cr-5Ti alloy is 0.30316nm and 0.30375nm, the swelling of V cell volume is 0.58%. There are two kinds of the secondary phase in as-cast alloy:1) Short strip secondary phase, has FCC structure, the lattice parameter is 0.4182~0.4228nm; 2) Elliptical-shaped secondary phase, has FCC structure, the lattice parameter is 0.4186~0.4242nm; In the process of solidification, Ti and C formed metastable interstitial phase (Ti2C), which has FCC structure, or V and C formed metastable interstitial phase (V2C), which has HCP structure; Then, atoms substituted by each other. Finally, the secondary phases are vanadium and chromium-alloyed precipitations of titanium oxycarbonitride, which chemical formula can be expressed as (Ti2-CON).

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李增德,林晨光,崔舜. V-5Cr-5Ti合金鑄態(tài)組織中的第二相行為研究[J].稀有金屬材料與工程,2017,46(1):104~110.[Li Zengde, Lin Chenguang, Cui Shun. Research of the Secondary Phase Behavior of As-cast V-5Cr-5Ti Alloy[J]. Rare Metal Materials and Engineering,2017,46(1):104~110.]
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  • 收稿日期:2014-10-19
  • 最后修改日期:2015-02-10
  • 錄用日期:2015-05-13
  • 在線發(fā)布日期: 2017-03-16
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