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電子束選區(qū)熔化增材制造TiAl合金的高溫硬度及氧化行為研究
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1.廣東工業(yè)大學(xué)材料與能源學(xué)院;2.廣東省科學(xué)院新材料研究所現(xiàn)代表面工程技術(shù)國家重點實驗室

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國家自然科學(xué)基金(52005113),廣東特支計劃(2019BT02C629),中國博士后科學(xué)基金資助項目(2021T140140),廣東省重點領(lǐng)域研發(fā)計劃(2020B090923002),廣州市重點領(lǐng)域研發(fā)計劃(202102020327),廣東省現(xiàn)代表面工程技術(shù)重點實驗室(2020B1212060049),廣東省科學(xué)院實施創(chuàng)新驅(qū)動發(fā)展能力建設(shè)專項資金項目(2020GDASYL-20200103112,2021GDASYL-20210302005)


High temperature hardness and oxidation behavior of TiAl alloy fabricated by electron beam selective melting additive
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    摘要:

    鈦鋁合金是航空航天領(lǐng)域具有廣闊應(yīng)用前景的輕質(zhì)高溫合金，電子束選區(qū)熔化（EBM）增材制造技術(shù)是制備復(fù)雜結(jié)構(gòu)TiAl合金有效途徑，但目前對其高溫性能研究較少。本文重點研究了電子束選區(qū)熔化增材制造Ti-48Al-2Cr-2Nb合金的顯微組織、高溫硬度及其高溫氧化行為。結(jié)果表明，EBM成形Ti-48Al-2Cr-2Nb合金呈現(xiàn)出由等軸γ晶粒和雙相區(qū)組成的獨特層狀組織；在800 ℃下恒溫氧化100 h，表現(xiàn)出較低的氧化速率常數(shù)，形成的氧化膜主要由TiO2、Al2O3及TiO2 / Al2O3混合交替層組成，抗氧化性能優(yōu)于傳統(tǒng)方法制備的Ti-48Al-2Cr-2Nb合金和其他TiAl合金。此外，900℃以下，該合金具有良好的高溫硬度，顯微硬度隨溫度的升高未發(fā)生明顯的下降趨勢。

    Abstract:

    TiAl alloy is a lightweight superalloy with broad application prospects in aerospace field. Electron beam selective melting(EBM) additive manufacturing technology is an effective way to prepare TiAl alloy with complex structure. However, there are few studies on high temperature properties of TiAl alloy. In this paper, the microstructure, high-temperature hardness and high-temperature oxidation behavior of Ti-48Al-2Cr-2Nb alloy fabricated by electron beam selective melting additive are mainly studied. The results show that the Ti-48Al-2Cr-2Nb alloy formed by EBM exhibits a unique layered structure composed of equiaxed γ grains and double phase regions. After isothermal oxidation at 800 °C for 100 h, this alloy shows a low oxidation rate constant, and the formed oxide film is mainly composed of TiO2, Al2O3 and TiO2 / Al2O3 mixed alternating layers. The oxidation resistance is better than that of Ti-48Al-2Cr-2Nb alloy and other TiAl alloy prepared by traditional methods. In addition, this alloy has good high temperature hardness at below 900 ℃, and the microhardness does not decrease significantly with the increase of temperature.

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譚宇璐,張艷梅,盧冰文,閆星辰,李艷輝,代明江,劉敏.電子束選區(qū)熔化增材制造TiAl合金的高溫硬度及氧化行為研究[J].稀有金屬材料與工程,2023,52(1):222~229.[tan yulu, zhang yanmei, lu bingwen, yan xingchen, li yanhui, dai mingjiang, liu min. High temperature hardness and oxidation behavior of TiAl alloy fabricated by electron beam selective melting additive[J]. Rare Metal Materials and Engineering,2023,52(1):222~229.]
DOI：10.12442/j. issn.1002-185X.20211090

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  • 收稿日期:2021-12-09
  • 最后修改日期:2022-01-21
  • 錄用日期:2022-02-09
  • 在線發(fā)布日期: 2023-02-13
  • 出版日期: 2023-02-08