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Ti-6Al-4V線材電弧增材制造的組織與性能研究
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西安理工大學(xué)材料科學(xué)與工程學(xué)院,西安理工大學(xué),西安理工大學(xué)材料科學(xué)與工程學(xué)院

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西安市科技支撐項目(CXY1342(2))


Microstructure and Properties of Ti-6Al-4V by Wire+Arc Additive Manufactured
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Xi’an University of Technology,Xi′an University of Technology,

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    摘要:

    本文采用Ti-6Al-4V線材為原料,以電弧為熱源將鈦合金絲材進(jìn)行熔融,逐層進(jìn)行堆積的快速增材制造,并對合金的凝固過程、組織形貌和力學(xué)性能等進(jìn)行分析。結(jié)果表明,在絲材電弧增材制造過程中,在開始堆積的1~2層為柱狀晶,隨后的堆積則以等軸晶的方式生長。而且電弧高的熱量輸出,使得每個堆積區(qū)-熔合區(qū)-堆積區(qū)得到了有效的冶金結(jié)合,沒有明顯的界面和鈦馬氏體,各區(qū)域的顯微組織均為穩(wěn)定的α+β片層組織以及接近的顯微硬度值。與鑄態(tài)Ti-6Al-4V相比,電弧增材制造的鈦合金不僅初始β晶粒細(xì)小,而且α+β片層間距也較小,其抗拉強度相比鑄態(tài)提高3.6%,延伸率提高37%,拉伸斷口為韌窩狀的韌性斷裂,與鑄態(tài)合金存在一定撕裂棱的準(zhǔn)解理斷口形貌差異明顯。

    Abstract:

    In this paper, Ti-6Al-4V alloy wire was molten by electric arc and then deposited layer by layer for the rapid prototyping of additive manufacture. Morphology, micro-hardness and mechanical properties of Ti-6Al-4V alloy were analyzed. The results indicate that the deposit in the first and the second layers is in the form of columnar crystals and the rest are equiaxial crystals. Meanwhile, a fair amount of heat from arc ensures a good metallurgical bonding in all of zones (deposition zone, fusion zone and deposition zone), and eliminates both clear deposition-layer and martensite of alloy. The integral alloy gets the stable α+β lamellar structural and similar micro-hardness of all zones. Compared with as-cast Ti-6Al-4V alloy, titanium alloy in this work obtains finer initial β-Ti grain and shorter α+β lamellar spacing by Wire+Arc Additive Manufactured. The ultimate strength and elongation of Ti-6Al-4V alloy have increased by 3.6% and 37%, respectively. Besides the tensile fracture morphology of Wire+Arc Additive Manufactured alloy is ductile dimple clearly different from that of as-cast alloy tearing edged quasi-cleavage.

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張飛奇,陳文革,田美嬌. Ti-6Al-4V線材電弧增材制造的組織與性能研究[J].稀有金屬材料與工程,2018,47(6):1890~1895.[ZHANG Feiqi, CHEN Wenge, TIAN Meijiao. Microstructure and Properties of Ti-6Al-4V by Wire+Arc Additive Manufactured[J]. Rare Metal Materials and Engineering,2018,47(6):1890~1895.]
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  • 收稿日期:2016-07-31
  • 最后修改日期:2017-03-02
  • 錄用日期:2017-03-16
  • 在線發(fā)布日期: 2018-09-06
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