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张飞奇,陈文革,田美娇.Ti-6Al-4V线材电弧增材制造的组织与性能研究[J].稀有金属材料与工程(英文),2018,47(6):1890~1895.[ZHANG Feiqi,CHEN Wenge and 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.]
Microstructure and Properties of Ti-6Al-4V by Wire+Arc Additive Manufactured
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Received:July 31, 2016  Revised:March 02, 2017
DOI:
Key words: Additive Manufacturing, Ti-6Al-4V alloy, wire, morphology, mechanical properties
Foundation item:西安市科技支撑项目(CXY1342(2))
Author NameAffiliation
ZHANG Feiqi,CHEN Wenge and TIAN Meijiao  
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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.