Volume 48 Issue S2
Oct.  2019
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Article Navigation >  Infrared and Laser Engineering  > 2019  >  48(S2): 7-15

Wang Wei, Zhang Lishu, Li Changfu, Qin Lanyun, Yang Guang, Liu Yanmei. Study on microstructure and mechanical properties of LDM-SLM hybrid manufactured Ti6Al4V titanium alloy[J]. Infrared and Laser Engineering, 2019, 48(S2): 7-15. doi: 10.3788/IRLA201948.S205002
Citation: Wang Wei, Zhang Lishu, Li Changfu, Qin Lanyun, Yang Guang, Liu Yanmei. Study on microstructure and mechanical properties of LDM-SLM hybrid manufactured Ti6Al4V titanium alloy[J]. Infrared and Laser Engineering, 2019, 48(S2): 7-15. doi: 10.3788/IRLA201948.S205002
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Study on microstructure and mechanical properties of LDM-SLM hybrid manufactured Ti6Al4V titanium alloy

doi: 10.3788/IRLA201948.S205002
  • 1.

    Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China;

  • 2.

    Shenyang Aircraft Industry(Group) Co.,LTD,Shenyang 110850,China

  • Received Date: 2019-04-01
  • Rev Recd Date: 2019-05-14
  • Publish Date: 2019-09-30
  • Laser addictive manufacturing(AM) of titanium alloys have great potential in aerospace field, as its unique advantages in small complex structure fabricaton and large components near-net shape forming. In order to achieve the fabrication of large components with complex structure just in one piece, the laser deposition manufacturing(LDM) was carried out with Ti6Al4V alloy as the basis by selective laser manufacturing(SLM). The attained samples which had two distinguishing AM processes, was conducted annealing treatment at different temperatures to explore the evolution of microstructure and mechanical properties. The result shows that the microstructures of Ti6Al4V alloy structure prepared by the LDM-SLM processes consists of three zones:LDM zone mainly composing laths, SLM zone dominated by slender acicular ' martensite and heat affected zone (HAZ) formed by remelting which is mainly composed of lath and ' martensite. In mechanical properties, the as-built component has the characters of high strength with low plastic, and significant anisotropy; samples annealing at 850℃ exhibit the best comprehensive mechanical properties because of the reasonable balance between the strength and the plastics. Work hardening in the tensile process leads to double necking of the tensile bar after 850℃ annealing.
  • [1] Xue Jun, Feng Jiantao, Ma Changzheng, et al. Influence of laser shock peening on microstructure and oxidation resistance of laser additive manufactured TC4 titanium alloy[J]. Chinese Optics, 2018, 11(2):198-205. (in Chinese)薛军, 冯建涛, 马长征, 等. 激光冲击强化对激光增材TC4钛合金组织和抗氧化性的影响[J]. 中国光学, 2018, 11(2):198-205.
    [2] Qi Guang, Wang Shuxin, Li Jinglin. Design of high volume fraction SiC/Al composite mirror in space remote sensor[J]. Chinese Optics, 2015, 8(1):99-106. (in Chinese)齐光, 王书新, 李景林. 空间遥感器高体分SiC/Al复合材料反射镜组件设计[J]. 中国光学, 2015, 8(1):99-106.
    [3] Liu Q, Wang Y, Zheng H, et al. Microstructure and mechanical properties of LMD-SLM hybrid forming Ti6Al4V alloy[J]. Materials Science and Engineering:A, 2016, 660:24-33.
    [4] Yang Guang, Liu Jiapeng, Qin Lanyun, et al. Study on microstructure and high cycle fatigue property of laser deposited TA15 titanium alloy[J]. Infrared and Laser Engineering, 2018, 47(11):1106003. (in Chinese)杨光, 刘佳蓬, 钦兰云, 等. 激光沉积TA15钛合金显微组织及高周疲劳性能研究[J]. 红外与激光工程, 2018, 47(11):1106003.
    [5] Li Jing, Lin Xin, Qian Yuanhong, et al. Study on microstructure and property of laser soild forming TC4 titanium alloy[J]. Chinese Journal of Lasers, 2014, 41(11):1103010. (in Chinese)李静, 林鑫, 钱远宏, 等. 激光立体成形TC4钛合金组织和力学性能研究[J]. 中国激光, 2014, 41(11):1103010.
    [6] Yang Guang, Wang Wendong, Qin Lanyun, et al. Effect of annealing temperature and soaking time on microstructures and microhardness of laser deposition manufacturing TA15 titanium alloy[J]. Infrared and Laser Engineering, 2017, 46(8):0806006. (in Chinese)杨光, 王文东, 钦兰云, 等. 退火温度及保温时间对激光沉积制造TA15钛合金微观组织和显微硬度的影响[J]. 红外与激光工程, 2017, 46(8):0806006.
    [7] Li Wenxian, Yi Danqing, Liu Huiqun, et al. Effect of the heat treatment process on microstructure and mechanical properties of the TC4 alloy processed by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2017, 22(1):70-78. (in Chinese)李文贤, 易丹青, 刘会群, 等. 热处理制度对选择性激光熔化成形TC4钛合金的组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2017, 22(1):70-78.
    [8] Xu W, Brandt M, Sun S, et al. Additive manufacturing of strong and ductile Ti6Al4V by selective laser melting via in situ martensite decomposition[J]. Acta Materialia, 2015, 85:74-84.
    [9] Wang Hongcheng, Zhang Ting, Wu Liqun, et al. Micro-feeding characteristics of chromium powder with irregular micron-size particles actuated by acoustic radiation force[J]. Optics and Precision Engineering, 2018, 26(6):1398-1406. (in Chinese)王洪成, 张婷, 吴立群, 等. 声辐射力驱动角形金属粉末微输送特性[J]. 光学精密工程, 2018, 26(6):1398-1406.
    [10] Hou Liya, Wang Zhenqi, Zhang Weiyi, et al. Experiments of micro characteristics of pulse-transfer for micro metallic powders[J]. Optics and Precision Engineering, 2011, 19(5):1030-1038. (in Chinese)侯丽雅, 王振琪, 章维一, 等.金属微粉体脉冲输送的微特性实验[J]. 光学精密工程, 2011, 19(5):1030-1038.
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Study on microstructure and mechanical properties of LDM-SLM hybrid manufactured Ti6Al4V titanium alloy

doi: 10.3788/IRLA201948.S205002
  • 1. Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China;
  • 2. Shenyang Aircraft Industry(Group) Co.,LTD,Shenyang 110850,China
  • Received Date: 2019-04-01
  • Rev Recd Date: 2019-05-14
  • Publish Date: 2019-09-30

Abstract: Laser addictive manufacturing(AM) of titanium alloys have great potential in aerospace field, as its unique advantages in small complex structure fabricaton and large components near-net shape forming. In order to achieve the fabrication of large components with complex structure just in one piece, the laser deposition manufacturing(LDM) was carried out with Ti6Al4V alloy as the basis by selective laser manufacturing(SLM). The attained samples which had two distinguishing AM processes, was conducted annealing treatment at different temperatures to explore the evolution of microstructure and mechanical properties. The result shows that the microstructures of Ti6Al4V alloy structure prepared by the LDM-SLM processes consists of three zones:LDM zone mainly composing laths, SLM zone dominated by slender acicular ' martensite and heat affected zone (HAZ) formed by remelting which is mainly composed of lath and ' martensite. In mechanical properties, the as-built component has the characters of high strength with low plastic, and significant anisotropy; samples annealing at 850℃ exhibit the best comprehensive mechanical properties because of the reasonable balance between the strength and the plastics. Work hardening in the tensile process leads to double necking of the tensile bar after 850℃ annealing.

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