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Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb
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Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb
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Beijing Municipal Science and Technology Project (D13110400300000)

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    摘要:

    研究了電子束快速成形TI6AL4V和Ti45Al7Nb合金混合粉末的特點，得到了成分均勻的Ti22Al3.5Nb2V合金。利用光學(xué)顯微鏡、掃描電鏡、電子探針等手段，研究了成形試樣的內(nèi)部組織，并測試了不同組織區(qū)域的顯微硬度。結(jié)果表明：TI6AL4V和Ti45Al7Nb合金混合粉末在電子束成形后，成分均勻，組織具有沉積態(tài)特征，包括板條馬氏體區(qū)和α2+β兩相區(qū)，板條馬氏體區(qū)位于成形零件頂部10個熔覆層厚度，在成形過程中，受再熱循環(huán)的影響，已凝固形成的馬氏體不斷分解形成α2+β兩相區(qū)，α2為短棒狀，β分布于α2相之間，在成形件底部，部分α2相發(fā)生等軸化。顯微硬度測試結(jié)果顯示，馬氏體區(qū)硬度明顯高于α2+β兩相區(qū)。拉伸結(jié)果顯示，抗拉伸強度為1214.3 MPa，延伸率達到18%。

    Abstract:

    The Ti-based components were synthesized via electron beam selective melting (EBSM) using blended pre-alloyed powders of Ti6Al4V and Ti45Al7Nb with a mass ratio of about 1:1. The microstructures and the chemical compositions of EBSM component samples were investigated by optical microscopy (OM), scanning electronic microscopy (SEM), electron probe micro-analyzer (EPMA) and X-ray diffraction (XRD). The results indicate that an increase of energy density leads to a decrease of fusion defects and an increase of density of the samples. The macro-structure consists of two regions, the martensite phase region and α2+β phase region. The martensite phase is formed due to the rapid solidification, while the reheating cycles have a remarkable effect on the formation of α2+β phase. The micro-hardness of martensite region is significantly higher than that of α2+β phase region. Due to the discontinuous distribution of thick platelet α2 phase along grain boundaries and the high coordinating deformation capability of equiaxial α2 phase, the samples have a tensile strength up to 1214.3 MPa, and a large elongation of 18%.

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葛文君,郭 超,林 峰. Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb[J].稀有金屬材料與工程,2015,44(11):2623~2627.[Ge Wenjun, Guo Chao, Lin Feng. Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb[J]. Rare Metal Materials and Engineering,2015,44(11):2623~2627.]
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  • 收稿日期:2014-10-14
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  • 在線發(fā)布日期: 2016-07-29
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