激光熔化沉积Ti-6Al-2Zr-Mo-V钛合金组织特征研究  

Microstructure Features of Laser Deposited Ti-6Al-2Zr-Mo-V Alloy

作　　者：贺瑞军[1] 王华明[1] 

机构地区：[1]北京航空航天大学激光材料加工与制造技术实验室,北京100191

出　　处：《航空材料学报》2009年第6期18-22,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金(50625413);973计划(2006CB605206-2)

摘　　要：采用激光熔化沉积快速制造工艺直接成形Ti-6Al-2Zr-Mo-V合金板材。激光熔化沉积过程中合金粉末充分熔化并在液态均匀混合以得到成分均匀、全致密的组织。SEM分析表明,激光沉积Ti-6Al-2Zr-Mo-V合金具有均匀细小的α/β双相片层组织,且片层取向随机多样,分布均匀。其组织特点与激光沉积过程中的快速凝固和固态相变有关。解释了其特征组织的形成机理,并讨论了其沉积层组织特征对性能的影响。Laser melting deposition （LMD） process was used to fabricate Ti-6Al-2Zr-Mo-V alloy directly. The metal powders were continuously melted and rapidly solidified layer upon layer directly into the near-net shape structure. The elements were fully melted and uniformly mixed in the molten pool that homogenized dense microstructure was obtained. Laser deposited Ti-6-Al-2Zr-Mo-V is characterized by a fine α/β lamellar microstructure with various random orientations, which should be related to the rapid solidification and phase transformation during the process. The influence of deposition layer on the fatigue strength is discussed.

关 键 词：激光熔化沉积 钛合金 快速凝固 显微组织 

分 类 号：TG146.4[一般工业技术—材料科学与工程]