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The effects of melting technologies on the microstructures and properties of Nb-16Si-22Ti-2Al-2Hf-17Cr alloy

机译:熔炼工艺对Nb-16Si-22Ti-2Al-2Hf-17Cr合金组织和性能的影响

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摘要

This paper deals with the effects of vacuum non-consumable arc-melting (VCAM), vacuum induction melting (VIM) and induction skull melting (ISM) technologies on microstructures, mechanical properties and oxidation resistance of Nb-16Si-22Ti-2Al-2Hf-17Cr alloy. It is revealed that the microstructure of the Nb-16Si-22Ti-2Al-2Hf-17Cr alloy is composed of Nb solid solution (Nb,Ti)_(ss), silicide (Nb,Ti)_5Si_3 and Laves phase NbCr_2. The ISM ingots exhibit the finest microstructure, while the VCAM ingot shows the coarsest microstructure. Refined at 1800℃ for 10 min, the VIM ingot with a 0.1% carbon addition shows the best room temperature toughness of 9.05 MPa m~(1/2) on average, however, the highest strength at 1250℃ was obtained on the ISM sample refined at technology parameters of 140kw melting for 2 min + 160 kw melting for 3 min. In addition, oxidation resistance was greatly improved through the ISM technology compared with the VCAM technology.
机译:本文探讨了真空非消耗电弧熔炼(VCAM),真空感应熔炼(VIM)和感应头骨熔炼(ISM)技术对Nb-16Si-22Ti-2Al-2Hf的组织,力学性能和抗氧化性的影响-17Cr合金。结果表明,Nb-16Si-22Ti-2Al-2Hf-17Cr合金的组织由Nb固溶体(Nb,Ti)_(ss),硅化物(Nb,Ti)_5Si_3和Laves相NbCr_2组成。 ISM铸锭显示出最佳的显微组织,而VCAM铸锭显示出最粗糙的显微组织。在1800℃下精炼10分钟,添加0.1%碳的VIM铸锭显示出最佳的室温韧性,平均为9.0​​5 MPa m〜(1/2),然而,在ISM样品上获得的最高强度为1250℃精炼工艺参数为140kw熔融2分钟+ 160kw熔融3分钟。另外,与VCAM技术相比,通过ISM技术大大提高了抗氧化性。

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