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混合元素法激光立體成形Ti-6Al-4V的組織及性能研究
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Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V from Blended Elemental Powders
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National Natural Science Foundation of China (No. 50871089); Talent Cultivating Program of Northwestern Polytechnical University (Grant No.05XE0131); National Basic Research Program (“973” Program) of China (No. 2007CB613805); Program for New Century Exce

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    摘要:

    以Ti、Al、V混合元素粉末為原料激光沉積Ti-6Al-4V，并對沉積態(tài)試樣的組織演化及力學(xué)性能進行研究。結(jié)果表明，與采用預(yù)合金Ti-6Al-4V粉末為原料所獲得的沉積試樣的凝固組織特征有所不同，采用混合元素粉末為原料獲得的沉積試樣的凝固組織隨激光功率的提高逐漸由等軸晶轉(zhuǎn)化為柱狀晶，熔池內(nèi)合金化過程所產(chǎn)生的混合熱的擾動作用是導(dǎo)致低功率條件下等軸晶形成的原因。原始β晶粒內(nèi)的微觀組織由大量的魏氏α板條和一定體積分數(shù)的板條間β相組成。這與采用預(yù)合金粉末基本相同?；旌显胤す饬Ⅲw成形Ti-6Al-4V的氧含量僅約0.1wt.%，沉積態(tài)Ti-6Al-4V的室溫拉伸性能超過鍛件標準要求。

    Abstract:

    The microstructure and mechanical properties of laser solid formed Ti-6Al-4V from the blend of Ti, Al, and V powders were investigated. It is found that the macrostructure changes from equiaxed to columnar grains with the increase of the laser power, which is very different from that of the samples using pre-alloyed powders as cladding materials. The disturbance effect of the mixing enthalpy during laser deposition is considered responsible for the formation of equiaxed grains at low laser powers. The microstructure within prior-β grains mainly consists of Widmanst?tten α laths separated by β-Ti, which is basically identical to those from pre-alloyed powders. Oxygen content of as-deposited samples was measured and the tensile testing was carried out. The results show that the oxygen content of as-deposited Ti-6Al-4V from blended elemental powders is only about 0.1wt.% and the mechanical properties are comparable to or even better than that of conventionally wrought material.

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譚 華,陳 靜,張鳳英,林 鑫,黃衛(wèi)東.混合元素法激光立體成形Ti-6Al-4V的組織及性能研究[J].稀有金屬材料與工程,2009,38(4):574~578.[Tan Hua, Chen Jing, Zhang Fengying, Lin Xin, Huang Weidong. Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V from Blended Elemental Powders[J]. Rare Metal Materials and Engineering,2009,38(4):574~578.]
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  • 收稿日期:2008-07-28
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