微合金元素對Ti-45Al-8Nb合金流動性能的影響Effects of micro-alloy elements on fluidity of Ti-45Al-8Nb alloy

采用8×8網格蠟網制備包埋料型殼，對比研究各微合金元素對Ti-45Al-8Nb合金熔體流動充型性能的影響。結果表明：微量Si、Y、Cr、B、Ni元素的加入能夠提高Ti-45Al-8Nb合金的流動性能；而W、Co元素的作用不明顯；Mo、V對基體合金的流動性不利。通過鑄造模擬軟件Procast對比分析，Cr、Ni的加入提高合金過熱度，增大了固液相線溫度差，提高了熔體的流動性；Si和Y提高合金的抗氧化性，減少熔體與型殼的反應程度，從而提高合金的流動性；B提高熔體流動性的原因歸結為其細化作用。

Embedded material shell was prepared using wax grid with 8×8 mesh. The effects of micro-alloy elements on the fluidity and mold filling property of Ti-45Al-8Nb melt were studied. The results show that the fluidity and mold filling property of Ti-45Al-8Nb melt are improved by Si, Y, Cr, B, Ni addition. However, W and Co show no apparent effectiveness. Mo and V have a negative impact on the fluidity. Procast, the casting simulation software was used to analyze the reasons. Cr and Ni can reduce the melting point and increase the superheat temperature, so, the fluidity of the melt is increased. Si and Y improve the oxidation resistance of alloy and reduce the reaction between melt and shell, therefore, the fluidity of the alloy enhances. B improves the fluidity property attributed to its refinement.

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