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Characterization of In-situ Titanium Matrix Composites Prepared by Laser Melting Deposition

稀有金属材料与工程 2011年第S3期40卷 33-37页

作者： Zhang Yongzhong1, Sun Jingchao1, Huang Can1, Li Guowei2 1 General Research Institute for Non-ferrous Metals, Beijing 100088, China 2 nantong entry-exit inspection and quarantine bureau, nantong 226005, China Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China nantong entry exit inspect & quarantine bur Nantong 226005 Peoples R China

Preliminary characterization of microstructure and mechanical properties of (TiB+TiC)/TC4 and TiC/Ti60 in-situ titanium matrix composites prepared by laser melting deposition is reported in this paper. The results indicate that in-situ reaction occurred during laser melting deposition of coaxially fed mixed powders from TC4 and B4C with formation of form TiB and TiC reinforcement. For TiC/Ti60 composites, there are some un-melted TiC particles and re-solidified TiC particles appeared as discontinuous chain-like morphology. Reinforcements of TiB and TiC with fraction about 25 vol% were formed with feeding 5 wt% B4C. The morphology of TiB tended to be needle-like and prismatic, while TiC appeared as granular. Small amount of un-reacted B4C with reduced size remained within the composites. A thin skull of reaction product formed around the un-reacted B4C weakened its interface bonding with the titanium alloy matrix, thus resulting in less outstanding properties of the composites. Under 600 ℃, the ultimate tensile strength of the TiCP (5wt%)/Ti60 composites was 60 MPa higher than that of Ti60 alloy, following with decreased elongation.

关键词： titanium matrix composites in-situ reaction laser melting deposition microstructure properties

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Characterization on Laser Melting Deposition of Metallic Components

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稀有金属材料与工程 2011年第S3期40卷 27-32页

作者： Zhang Yongzhong1, Shi Likai1, Li Guowei2, Xi Mingzhe3 1 General Research Institute for Non-ferrous Metals, Beijing 100088, China 2 nantong entry-exit inspection and quarantine bureau, nantong 226005, China 3 Yanshan University, Qinhuangdao 066004, China Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China nantong entry exit inspect & quarantine bur Nantong 226005 Peoples R China Yanshan Univ Qinhuangdao 066004 Peoples R China

Laser melting deposition process (LMD) is an advanced computer-aided laser additive manufacturing process (LAM). This process can produce net-shape components with fully dense microstructure and good properties based on a computer aided design (CAD) model by using a high power laser to melt the injected powders and re-solidify them in a layered way. It presents obvious superiority in direct manufacturing components with small-lot, repairing high-value components with good performance, and integrated fabricating new materials and composite structure. Deep understanding the melting process, alloying and reaction within the molten pool, solidification behavior, as well as formation and control of residual stress and defects during deposition are crucial to successful application.

关键词： laser melting deposition solidified microstructure residual stress defects interface flexible manufacturing

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