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環(huán)境氧含量對激光定向能量沉積TC4合金組織及性能的影響
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1.南昌航空大學 輕合金加工科學與技術國防重點學科實驗室;2.1南昌航空大學 輕合金加工科學與技術國防重點學科實驗室

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國家自然科學基金資助（項目號51865036, 52265053），江西省自然科學基金（項目號20192ACBL21050, 20202BABL204039）


Effects of Atomtmosphere Oxygen Content on Microstructure and Mechanical Properties of TC4 Titanium Alloy Prepared by Laser Directed Energy Deposition
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National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University

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國家自然科學基金資助（項目號51865036, 52265053），江西省自然科學基金（項目號20192ACBL21050, 20202BABL204039）

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    摘要:

    研究了環(huán)境氣氛氧含量對激光定向能量沉積TC4鈦合金組織及力學性能的影響，通過OM、SEM和TEM及硬度實驗、拉伸實驗對成形試樣的顯微組織、力學性能和斷口進行分析。結(jié)果表明：當成形氣氛氧含量從50ppm、500ppm、2000ppm到5000 ppm逐漸提高，試樣表面氧化程度增加，TC4鈦合金試樣表面顏色由由銀白色逐漸過渡到黃色、藍色和深灰色，XRD衍射圖譜結(jié)果表明，試塊表面氧化物種類增多，氧化層的厚度也逐漸增加；試樣顯微組織逐漸由網(wǎng)籃狀組織轉(zhuǎn)變?yōu)獒槧铖R氏體α′組織，板條粗化，長寬比減??；TC4鈦合金試樣的硬度和室溫抗拉強度隨成形氣氛氧含量的增加逐漸提高，受金屬晶格畸變及冷卻速度的影響，沉積態(tài)成形試樣的抗拉強度由920 MPa增加到982 MPa，延伸率由12.4%減小到10.9%。

    Abstract:

    TC4 titanium alloy specimens were prepared by laser directed energy depositon in different oxygen contents of inert atmosphere. The effects of oxygen content in the argon shielding gas on microstructure, fracture surface and mechanical properties of TC4 titanium alloy by laser directed energy depositon have been investigated by optical microstructure (OM), scanning electron microscopy (SEM) , transmission electron microscope (TEM), microhardness testing and tensile testing. The results show that the oxidation degree of the samples surface increase, and the surface color of TC4 titanium alloy samples gradually change from silver white to yellow, blue and dark gray with the increasing of the oxygen content of the atmosphere. From XRD analysis, the types of oxides on the sample surface increase, and the thickness of the oxide layers also increase gradually. The microstructure of the specimens gradually change from basket structure to acicular martensite α" structure, the laths are coarsened and the aspect ratios are reduced. The hardness and tensile strength at room temperature of TC4 titanium alloy samples increase gradually with the increase of oxygen content in the forming atmosphere. Due to the influence of metal lattice distortion and cooling rate, the tensile strength of the deposition samples increase from 920 MPa to 982 MPa and the elongation decreased from 12.4% to 10.9%.

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引用本文

高健,劉奮成,劉豐剛,尤啟凡,魏昱涵,程詩翔.環(huán)境氧含量對激光定向能量沉積TC4合金組織及性能的影響[J].稀有金屬材料與工程,2023,52(11):3881~3892.[Gao Jian, Liu Fencheng, Liu Fenggang, You Qifan, Wei Yuhan, Cheng Shixiang. Effects of Atomtmosphere Oxygen Content on Microstructure and Mechanical Properties of TC4 Titanium Alloy Prepared by Laser Directed Energy Deposition[J]. Rare Metal Materials and Engineering,2023,52(11):3881~3892.]
DOI：10.12442/j. issn.1002-185X.20220858

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  • 收稿日期:2022-11-01
  • 最后修改日期:2022-12-03
  • 錄用日期:2022-12-06
  • 在線發(fā)布日期: 2023-11-27
  • 出版日期: 2023-11-22