1at%的Al宏觀偏析;采用優(yōu)質(zhì)原料,通過抽真空→熔化→充氬氣→精煉的工藝路線可以使合金的含氧量達(dá)300 μg/g。雖然存在Al宏觀偏析,但是不存在原料未熔和在鑄錠局部富集的現(xiàn)象,鑄錠組織為近片層組織。"/>

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真空懸浮熔煉高鈮TiAl合金鑄錠的成分組織均勻性
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國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃“973計(jì)劃”(2011CB605501);國(guó)家自然科學(xué)基金(51171015)


Homogeneity of Composition and Structure for High Nb Containing TiAl Alloy Ingots Prepared by Vacuum Levitation Melting
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    從宏觀缺陷、化學(xué)成分分布、O含量和微觀組織等幾個(gè)方面,分析了真空懸浮熔煉制備高鈮TiAl合金鑄錠的冶金質(zhì)量。結(jié)果表明,經(jīng)過合理設(shè)計(jì)錠??梢垣@得集中縮孔面積小、無裂紋的鑄錠。真空懸浮二次熔煉獲得的鑄錠不同部位有成分>1at%的Al宏觀偏析;采用優(yōu)質(zhì)原料,通過抽真空→熔化→充氬氣→精煉的工藝路線可以使合金的含氧量達(dá)300 μg/g。雖然存在Al宏觀偏析,但是不存在原料未熔和在鑄錠局部富集的現(xiàn)象,鑄錠組織為近片層組織。

    Abstract:

    Metallurgical quality of high Nb containing TiAl ingots prepared by vacuum levitation melting (VLM) has been investigated from respects of macroscopic defects, composition distribution, oxygen content and microstructure. After twice melting and pouring the melting into properly designed mould, crack-free ingots with small shrinkage defects could be obtained. There are Al macrosegregation (>1at%) at different positions of ingots. Oxygen content is decreased to 300 mg/kg by using high quality raw materials and a optimized melting process. There are not phases and microstructures induced by high melting point raw materials in the ingot, and the as-cast microstructures of the ingots are typically nearly lamellar microstructure.

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張志勇,徐向俊,郝國(guó)建,張來啟,林均品.真空懸浮熔煉高鈮TiAl合金鑄錠的成分組織均勻性[J].稀有金屬材料與工程,2014,43(12):3063~3067.[Zhang Zhiyong, Xu Xiangjun, Hao Guojian, Zhang Laiqi, Lin Junpin. Homogeneity of Composition and Structure for High Nb Containing TiAl Alloy Ingots Prepared by Vacuum Levitation Melting[J]. Rare Metal Materials and Engineering,2014,43(12):3063~3067.]
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  • 收稿日期:2013-12-21
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  • 在線發(fā)布日期: 2015-04-16
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