2Cu)及富Fe脆性相在層間密集分布形成薄弱帶,是導致水平方向和垂直方向力學性能各向異性的原因。垂直方向拉伸時,微裂紋易于在層間形成,塑性較差、抗拉強度較低。為提高WAAM成形的2219鋁合金垂直方向力學性能,需盡可能降低絲材中的Fe、Si雜質(zhì)含量。"/>

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2219鋁合金電弧增材制造組織及力學性能的非均勻性
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首都航天機械有限公司

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科技部重點研發(fā)計劃(項目號2018YFB1106305),載人航天項目


Study on the inhomogeneous microstructures and mechanical properties of additively manufactured 2219 aluminum alloy
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1.Capital Aerospace Machinery Corporation Limited,Beijing,100076;2.China

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    摘要:

    2219鋁合金電弧增材制造技術(shù)在航天領(lǐng)域具有廣泛的應用前景。采用基于CMT工藝的電弧增材制造技術(shù)成形了2219鋁合金單壁墻試樣,并研究了沉積態(tài)、固溶態(tài)、固溶+時效態(tài)的顯微組織與力學性能。結(jié)果表明顯微氣孔、θ(Al2Cu)及富Fe脆性相在層間密集分布形成薄弱帶,是導致水平方向和垂直方向力學性能各向異性的原因。垂直方向拉伸時,微裂紋易于在層間形成,塑性較差、抗拉強度較低。為提高WAAM成形的2219鋁合金垂直方向力學性能,需盡可能降低絲材中的Fe、Si雜質(zhì)含量。

    Abstract:

    Wire and Arc Additive manufacturing (WAAM) of 2219 aluminum alloy parts is a prospective manufacturing technology in the aerospace industry. In this study, the single wall specimens of 2219 aluminum alloy were built by WAAM technology using CMT welding process. The microstructure characteristics in as deposited state, solid solution state and artificial aging state were systematically investigated. It was found that the weakness strip with more micro porosities, θ(Al2Cu) phases and iron rich phases in the interlayer region resulted in the anisotrpic mechanical properties of the WAAM specimens. When the specimens were tensioned in the vertical direction, cracks formed easily in the interlayer region, and deteriorated the tensile strength and plasticity. In order to increase the mechanical properties of the WAAM 2219 aluminum alloy in the vertical direction, the composition of Fe and Si in the wire should be as low as possible.

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李權(quán),羅志偉,馮晨,張睿澤,宋全,虞波,王福德.2219鋁合金電弧增材制造組織及力學性能的非均勻性[J].稀有金屬材料與工程,2020,49(11):3969~3976.[LI Quan, LUO Zhiwei, FENG Chen, ZHANG Ruize, Song Quan, YU Bo, WANG Fude. Study on the inhomogeneous microstructures and mechanical properties of additively manufactured 2219 aluminum alloy[J]. Rare Metal Materials and Engineering,2020,49(11):3969~3976.]
DOI：10.12442/j. issn.1002-185X.20191041

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  • 收稿日期:2019-12-08
  • 最后修改日期:2020-02-22
  • 錄用日期:2020-03-05
  • 在線發(fā)布日期: 2020-12-09
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