Effect of annealing treatment on microstructures and mechanical properties of TC4 titanium alloy manufactured by laser deposition
QIN Lan-yun1, HE Xiao-di1, LI Ming-dong1, YANG Guang1, GAO Bo-wen2
1. Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China;
2. School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111003, Liaoning, China
Abstract：TC4 titanium alloy bulk specimens were prepared by laser deposition manufacturing.The effect of annealing treatment on mechanical properties, microstructure of LDMed TC4 titanium alloy was studied by optical microstructure (OM),scanning electron microscopy (SEM) and X-ray diffraction (XRD).The experimental results show that the microstructure is basketweave structure after α+β two-phase region annealing treatment and is transformed to Widmanstatten structure after β phase region annealing treatment.The mechanical properties still show significant anisotropy after annealing:Z-direction samples exhibit low strength and high plasticity, while XY-direction samples show high strength and low plasticity.The samples have a greatly decrease in strength and plasticity after β phase region annealing treatment.The annealing temperature has obvious influence on the anisotropy of the samples. The tensile properties of XY-direction samples are evidently scattered.Both direction samples exhibit ductile fracture after α+β two-phase region annealing treatment. The strength and plasticity of the samples decrease greatly after β single phase region annealing treatment, and the XY-direction samples are brittle fracture.
钦兰云, 何晓娣, 李明东, 杨光, 高博文. 退火处理对激光沉积制造TC4钛合金组织及力学性能影响[J]. 材料工程, 2020, 48(2): 148-155.
QIN Lan-yun, HE Xiao-di, LI Ming-dong, YANG Guang, GAO Bo-wen. Effect of annealing treatment on microstructures and mechanical properties of TC4 titanium alloy manufactured by laser deposition. Journal of Materials Engineering, 2020, 48(2): 148-155.
[1] 卢秉恒,李涤尘. 增材制造(3D打印)技术发展[J]. 机械制造与自动化,2013, 42(4):1-4. LU B H, LI D C. Development of the additive manufacturing(3D printing) technology[J]. Mechanical Building and Automation,2013, 42(4): 1-4.
[2] 王华明. 高性能大型金属构件激光增材制造:若干材料基础问题[J]. 航空学报,2014, 35(10): 2690-2698. WANG H M. Materials' fundamental issues of laser additive manufacturing for high-performance large metallic components[J]. Acta Aeronautica et Astronautica Sinica, 2014, 35(10): 2690-2698.
[3] 童邵辉,李东,邓增辉,等.电子束快速成形TC4合金的组织和断裂性能[J].材料工程,2019,47(1):125-130. TONG S H,LI D,DENG Z H,et al.Microstructure and fracture properties of electron beam rapid forming TC4 alloy[J].Journal of Materials Engineering,2019,47(1):125-130.
[4] THIJS L, VERHEAGHE F, CRAEGHS T, et al. A study of the microstructure evolution during selective laser melting of Ti-6Al-4V[J]. Acta Materialia, 2010,58(9): 3303-3312.
[5] FORMANOIR C, MICHOTTE S, RIGO O, et al. Electron beam melted Ti-6Al-4V:microstructure,texture and mechanical behavior of the as-built and heat-treated material[J]. Materials Science and Engineering:A, 2016,652: 105-119.
[6] VRANCKEN B, THIJS L, KRUTH J P, et al. Microstructure and mechanical properties of a novel β titanium metallic composite by selective laser melting[J]. Acta Mater, 2014, 68: 150-158.
[7] LIU Z, QIN Z X, LIU F, et al. The microstructure and mechanical behaviors of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy produced by laser melting deposition[J].Mater Charact,2014,97:132-139.
[8] BRANDL E, PALM F, MICHAILOV V, et al. Mechanical properties of additive manufactured titanium(Ti-6Al-4V)blocks deposited by a solid-state laser and wire[J]. Materials & Design, 2011, 32(10): 4665-4675.
[9] BAUFELD B, BRANDL E, VAN DER BIEST O. Wire based additive layer manufacturing: comparison of microstructure and mechanical properties of Ti-6Al-4V components fabricated by laser-beam deposition and shaped metal deposition [J]. Journal of Materials Processing Technology, 2011, 211(6): 1146-1158.
[10] VRANCKEN B, THIJS L, KRUTH J P, et al. Heat treatment of Ti6Al4V produced by selective laser melting microstructure and properties[J]. Journal of Alloys and Compounds, 2012, 541(15): 177-185.
[11] ZHANG Q, CHEN J, ZHAO Z, et al.Microstructure and anisotropic tensile behavior of laser additive manufactured TC21 titanium alloy[J]. Materials Science and Engineering: A, 2016, 673: 204-212.
[12] 辛社伟,赵永庆. 关于钛合金热处理和析出相的讨论[J]. 金属热处理, 2006, 31(9):39-42. XIN S W, ZHAO Y Q. Discussion about the heat treatment and precipitated phases of titanium alloy[J]. Heat Treatment of Metals, 2006, 31(9): 39-42.
[13] 杨光,王文东,钦兰云,等. 退火处理及沉积方向对激光沉积TA15钛合金组织与性能的影响[J]. 稀有金属材料与工程, 2016, 45(12):3295-3301. YANG G,WANG W D,QIN L Y,et al. Effect of annealing treatment and deposition direction on microstructures and mechanical properties of laser deposition manufactured TA15 titanium alloy[J]. Rare Metal Materials and Engineering, 2016, 45(12): 3295-3301.
[14] ZHAO Z, CHEN J, LU X F, et al. Formation mechanism of α variant and its influence on the tensile properties of laser soild formed Ti-6Al-4V titanium alloy[J]. Materials Science and Engineering: A, 2017, 691: 16-24.
[15] YANG J J, YU H C, WANG Z M, et al. Effect of crystallographic orientation on mechanical anisotropy of select laser melted Ti-6Al-4V alloy[J]. Materials Characterization, 2017, 127: 137-145.
[16] 杨光,宋海浩,钦兰云,等. 钛合金激光沉积热行为及组织演变[J]. 稀有金属材料与工程, 2016, 45(10): 2598-2604. YANG G, SONG H H, QIN L Y, et al. Thermal behavior and microstructure evolution of titanium alloy by laser deposition[J]. Rare Metal Materials and Engineering, 2016, 45(10): 2598-2604.
2020, Vol. 48 
