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原位合金化雙絲電弧增材制造γ-TiAl組織性能研究
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天津大學(xué) 天津市現(xiàn)代連接技術(shù)重點(diǎn)實(shí)驗(yàn)室

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TG146.2+3

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國家自然科學(xué)基金(51574177)


Microstructure and properties of γ-TiAl fabricated by in-situ alloying assisted double-wire arc additive manufacturing
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    摘要:

    本文采用雙絲電弧增材制造的方法制備了Ti-48Al合金，在此基礎(chǔ)上通過原位合金化制備了Ti-48Al-2Cr-2Nb金屬間化合物，借助XRD，OM，SEM，微小力學(xué)拉伸以及高溫氧化試驗(yàn)表征了兩種合金的組織與性能。研究結(jié)果表明，兩種堆積試樣的成分均勻，并且均由γ-TiAl和α2-Ti3Al片層組織組成，微量合金元素Cr和Nb的添加不改變合金的相組成。微小力學(xué)拉伸結(jié)果證實(shí)了Cr和Nb微量元素的添加可以顯著提高合金的抗拉強(qiáng)度，但對塑性沒有明顯的影響。高溫抗氧化性試驗(yàn)結(jié)果表明，Ti-48Al-2Cr-2Nb合金試樣比Ti-48Al合金具有更優(yōu)良的抗氧化性能，試樣的最終增重由5.26 g/cm2降低至1.95 g/cm2。

    Abstract:

    Ti-48Al and Ti-48Al-2Cr-2Nb alloys were fabricated by in-situ alloying assisted double-wire arc additive manufacturing. The microstructure and properties of the two alloys were characterized by XRD, OM, SEM, micro mechanical tensile test and high temperature oxidation test. The results showed that both of these two deposited alloys showed quite uniform components and composed of γ-TiAl and α2-Ti3Al. The addition of tracing Cr and Nb showed no significant effect on microstructure. Micro tensile testing showed that ultimate strength elevated after the addition of Cr and Nb yet no significant effect to plasticity. High temperature oxidation resistance test confirmed that Ti-48Al-2Cr-2Nb has a good resistance to oxidation compared to Ti-48Al. The final weight gain of the sample decreased from 5.26mg /cm2 to 1.95mg /cm2.

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劉齊,張萌,付樂琪,楊振文,王穎,王東坡.原位合金化雙絲電弧增材制造γ-TiAl組織性能研究[J].稀有金屬材料與工程,2020,49(11):3919~3924.[Liu Qi, Zhang Meng, Fu Leqi, Yang Zhenwen, Wang Ying, Wang Dongpo. Microstructure and properties of γ-TiAl fabricated by in-situ alloying assisted double-wire arc additive manufacturing[J]. Rare Metal Materials and Engineering,2020,49(11):3919~3924.]
DOI：10.12442/j. issn.1002-185X.20191001

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  • 收稿日期:2019-11-27
  • 最后修改日期:2020-03-17
  • 錄用日期:2020-03-19
  • 在線發(fā)布日期: 2020-12-09
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