赵瑞峰,李金山,张颖,李佩璇,王嘉祥,邹程雄,唐斌,寇宏超,甘斌,张亮,王军,王毅.强磁场下退火对增材制造Ti-6Al-4V合金及其力学性能的影响[J].稀有金属材料与工程,2018,47(12):3678~3685.[Ruifeng Zhao,Jinshan Li,Ying Zhang,Peixuan Li,Jiaxiang Wang,Chengxiong Zou,Bin Tang,Hongchao Kou,Bin Gan,Liang Zhang,Jun Wang,William Yi Wang.Improved Mechanical Properties of Additive Manufactured Ti-6Al-4V Alloy via Annealing in High Magnetic Field[J].Rare Metal Materials and Engineering,2018,47(12):3678~3685.]
强磁场下退火对增材制造Ti-6Al-4V合金及其力学性能的影响
投稿时间:2018-10-10  修订日期:2018-10-30
中文关键词:  Ti-6Al-4V  激光选区熔化  热处理  键合电子密度
基金项目:the National Natural Science Foundation of China (Grants 51690163), National Key Research and Development Program of China (2016YFB0701304 and 2016YFB0701303), Project to Strengthen Industrial Development at the Grass-Roots Level (Project Number TC160A310/19), and Shanghai Rising-star Program (Project Number 18QB1400600).
中文摘要:
      本文基于提出的一种崭新的磁场驱动方法有效地提高了激光选区熔化Ti-6Al-4V合金的力学性能。通过X射线衍射、光学显微镜、扫描电子显微镜和原子力显微镜,系统地表征了初始态和在7T强磁场下退火30分钟的样品的微观结构。其中,退火温度分别选取在低于β转变温度的400 ℃和800 ℃,以及高于β转变温度的1200 ℃。键合电荷密度不仅可以表征由Al和V原子引起的晶格畸变,还可以从电子和原子本质上揭示固溶强化机制和马氏体相变机制。由于退火时间较短,经7T强磁场400℃和1200℃退火的试样的极限抗拉强度和伸长率均比初始态的试样有所提高。上述结果表明,通过热和磁场的耦合效应,可以预期改变激光选区熔化Ti-6Al-4V合金的相变热力学,进而有效地优化其微观结构。这一设想的验证将有助于开发一种有效地提高增材制造材料的力学性能的新型磁场驱动方法。
Improved Mechanical Properties of Additive Manufactured Ti-6Al-4V Alloy via Annealing in High Magnetic Field
英文关键词:Ti-6Al-4V  Selective laser melting  Heat treatment  Bonding charge density
英文摘要:
      In this work, a novel magnetic-field-driving approach is proposed and utilized to efficiently enhance the mechanical properties of selective laser melting Ti-6Al-4V. The microstructures of the as-built and the SLM specimens annealed at 400°C, 800°C below the β transus, and 1200°C above the β transus for 30 minutes in the high magnetic field of 7 T are comprehensively characterized in terms of X-ray diffraction, optical microscope, scanning electron microscope, and atomic force microscope. Lattice distortion induced by Al and V atoms are characterized by bonding charge density, providing an insight into the atomic and electronic basis for the solid solution strengthening mechanism and the martensitic transformation mechanism. Referring to the as-built speciments, the ultimate tensile strength and the elongation of annealed specimens at 400 °C and 1200°C in 7T high magnetic field were increased due to the short annealing time. Based on the coupling effect of force field induced by the heat and magnetic, it is expected that the microstructures of SLM Ti-6Al-4V would be conventionally optimized through changing the phase transformation thermodynamics. The validation of this hypothesis will pave a path to develop a novel magnetic-field-driving approach efficiently enhancing the mechanical properties of additive manufactured materials.
作者单位E-mail
赵瑞峰 凝固技术国家重点实验室 18618288307@139.com 
李金山 凝固技术国家重点实验室  
张颖 凝固技术国家重点实验室 sarah19951205@163.com 
李佩璇 凝固技术国家重点实验室  
王嘉祥 凝固技术国家重点实验室  
邹程雄 凝固技术国家重点实验室  
唐斌 凝固技术国家重点实验室  
寇宏超 凝固技术国家重点实验室  
甘斌 凝固技术国家重点实验室  
张亮 上海3D打印材料工程研究中心上海材料研究所  
王军 凝固技术国家重点实验室  
王毅 凝固技术国家重点实验室  
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