Microstructural evolution and mechanical properties of selective laser melted Ti-6Al-4V induced by annealing treatment

Abstract

Ti-6Al-4V specimens were fabricated by selective laser melting (SLM) to study the effect of thermal treatment on the phase transformation, elemental diffusion, microstructure, and mechanical properties. The results show that vanadium enriches around the boundary of α phases with increasing annealing temperature to 973 K, and α′ phases transform into α+β at 973 K. The typical α′ martensite microstructure transforms to fine-scale equiaxed microstructure at 973 K and the equiaxed microstructure significantly coarsens with increasing annealing temperature to 1273 K. The SLM Ti-6Al-4V alloy annealed at 973 K exhibits a well-balanced combination of strength and ductility ((1305±25) MPa and (37±3) %, respectively).

Keywords

selective laser melting / Ti-6Al-4V / annealing treatment / microstructure / mechanical properties

References

[1] BanerjeeD, WilliamsJ C. Perspectives on titanium science and technology [J]. Acta Materialia, 2013, 61(3): 844-879

[2] EhtemamH S, LuH B, JianG Y, CaoG H, HabibiD, ZhangL C. Effect of α″ martensite on the microstructure and mechanical properties of beta-type Ti-Fe-Ta alloys [J]. Materials & Design, 2015, 76: 47-54

[3] GeethaM, SinghA K, AsokamaniR, GogiaA K. Ti based biomaterials, the ultimate choice for orthopaedic implants-A review [J]. Progress in Materials Science, 2009, 54(3): 397-425

[4] DonoghueJ, AntonysamyA A, MartinaF, ColegroveP A, WilliamsS W, PrangnellP B. The effectiveness of combining rolling deformation with wire-arc additive manufacture on β-grain refinement and texture modification in Ti-6Al-4V [J]. Materials Characterization, 2016, 114: 103-114

[5] WangS-g, WuX-qiang. Investigation on the microstructure and mechanical properties of Ti-6Al-4V alloy joints with electron beam welding [J]. Materials & Design, 2012, 36: 663-670

[6] AttarH, CalinM, ZhangL C, ScudinoS, EckertJ. Manufacture by selective laser melting and mechanical behavior of commercially pure titanium [J]. Materials Science and Engineering A, 2014, 593: 170-177

[7] AttarH, BoenischM, CalinM, ZhangL C, ScudinoS, EckertJ. Selective laser melting of in situ titanium-titanium boride composites: Processing, microstructure and mechanical properties [J]. Acta Materialia, 2014, 76: 13-22

[8] ZhangS-y, LinX, ChenJ, HuangW-dong. Heat-treated microstructure and mechanical properties of laser solid forming Ti-6Al-4V alloy [J]. Rare Metals, 2009, 28(6): 537-544

[9] ZhouL-b, YuanT-c, LiR-d, TangJ-z, WangM-b, MeiF-sheng. Anisotropic mechanical behavior of biomedical Ti-13Nb-13Zr alloy manufactured by selective laser melting [J]. Journal of Alloys and Compounds, 2018, 762: 289-300

[10] WangP, EckertJ, PrashanthK G, WuM-w, KabanI, XiL-x, ScudinoS. A review of particulate-reinforced aluminum matrix composites fabricated by selective laser melting [J]. Transactions of Nonferrous Metals Society of China, 2020, 30(8): 2001-2034

[11] YangX, RenY-j, LiuS-f, WangQ-j, ShiM-jun. Microstructure and tensile property of SLM 316L stainless steel manufactured with fine and coarse powder mixtures [J]. Journal of Central South University, 2020, 27(2): 334-343

[12] GuD-d, HagedornY C, MeinersW, MengG-b, BatistaR J S, WissenbachK, PopraweR. Densification behavior, microstructure evolution, and wear performance of selective laser melting processed commercially pure titanium [J]. Acta Materialia, 2012, 60(9): 3849-3860

[13] ZhouL-b, YuanT-c, TangJ-z, HeJ, LiR-di. Mechanical and corrosion behavior of titanium alloys additively manufactured by selective laser melting-A comparison between nearly β titanium, α titanium and α+β titanium [J]. Optics & Laser Technology, 2019, 119: 105625

[14] LuS-l, TangH-p, QianM, HongQ, ZengL-y, StjohnD H. A yttrium-containing high-temperature titanium alloy additively manufactured by selective electron beam melting [J]. Journal of Central South University, 2015, 22(8): 2857-2863

[15] WangP, LaoC-s, ChenZ-w, LiuY-k, WangH, WendrockH, EckertJ, ScudinoS. Microstructure and mechanical properties of Al-12Si and Al-3.5Cu-1.5Mg-1Si bimetal fabricated by selective laser melting [J]. Journal of Materials Science & Technology, 2020, 3618-26

[16] PaulyS, WangP, KuehnU, KosibaK. Experimental determination of cooling rates in selectively laser-melted eutectic Al-33Cu [J]. Additive Manufacturing, 2018, 22: 753-757

[17] LiuS-y, ShinY C. Additive manufacturing of Ti6Al4V alloy: A review [J]. Materials & Design, 2019, 164: 107552

[18] SchwabH, PalmF, KuehnU, EckertJ. Microstructure and mechanical properties of the near-beta titanium alloy Ti-5553 processed by selective laser melting [J]. Materials & Design, 2016, 10575-80

[19] MurrL E, QuinonesS A, GaytanS M, LopezM I, RodelaA, MartinezE Y, HernandezD H, MartinezE, MedinaF, WickerR B. Microstructure and mechanical behavior of Ti-6Al-4V produced by rapid-layer manufacturing, for biomedical applications [J]. Journal of the Mechanical Behavior of Biomedical Materials, 2009, 2(1): 20-32

[20] ThompsonM K, MoroniG, VanekerT, FadelG, CampbellR I, GibsonI, BernardA, SchulzJ, GrafP, AhujaB, MartinaF. Design for additive manufacturing: Trends, opportunities, considerations, and constraints [J]. CIRP Annals-Manufacturing Technology, 2016, 65(2): 737-760

[21] ZhangL-c, AttarH. Selective laser melting of titanium alloys and titanium matrix composites for biomedical applications: A review [J]. Advanced Engineering Materials, 2016, 18(4): 463-475

[22] KarimzadehF, HeidarbeigyM, SaatchiA. Effect of heat treatment on corrosion behavior of Ti-6Al-4V alloy weldments [J]. Journal of Materials Processing Technology, 2008, 206(1–3): 388-394

[23] ZhangA-l, LiuD, WuX-h, WangH-ming. Effect of heat treatment on microstructure and mechanical properties of laser deposited Ti60A alloy [J]. Journal of Alloys and Compounds, 2014, 585: 220-228

[24] VranckenB, ThijsL, KruthJ P, HumbeeckJ V. Heat treatment of Ti6Al4V produced by selective laser melting: Microstructure and mechanical properties [J]. Journal of Alloys and Compounds, 2012, 541: 177-185

[25] WuS Q, LuY J, GanY L, HuangT T, ZhaoC Q, LinJ J, GuoS, LinJ X. Microstructural evolution and microhardness of a selective-laser-melted Ti-6Al-4V alloy after post heat treatments [J]. Journal of Alloys and Compounds, 2016, 672: 643-652

[26] VilaroT, ColinC, BartoutJ D. As-fabricated and heat-treated microstructures of the Ti-6Al-4V alloy processed by selective laser melting [J]. Metallurgical and Materials Transactions A, 2011, 42(10): 3190-3199

[27] ZengL, BielerT R. Effects of working, heat treatment, and aging on microstructural evolution and crystallographic texture of α, α′, α″ and β phases in Ti-6Al-4V wire [J]. Materials Science and Engineering A, 2005, 392(12): 403-414

[28] McquillanM K. Phase transformations in titanium and its alloys [J]. Metallurgical Reviews, 1963, 8(1): 41-104

[29] JandaghiM R, PouraliakbarH, SabooriA. Effect of second-phase particles evolution and lattice transformations while ultrafine graining and annealing on the corrosion resistance and electrical conductivity of Al-Mn-Si alloy [J]. Materials Research Express, 2019, 6(10): 1065d9

[30] XuW, BrandtM, SunS, ElambasserilJ, LiuQ, LathamK, XiaK, QianM. Additive manufacturing of strong and ductile Ti-6Al-4V by selective laser melting via in situ martensite decomposition [J]. Acta Materialia, 2015, 85: 74-84

[31] QaziJ I, SenkovO N, RahimJ, GencA, ForesF H. Phase transformations in Ti-6Al-4V-xH alloys [J]. Metallurgical and Materials Transactions A, 2001, 32(10): 2453-2463

[32] AhmedT, RackH J. Phase transformations during cooling in α+β titanium alloys [J]. Materials Science and Engineering A, 1998, 243(1): 206-211

[33] SafdarA, WeiL Y, SnisA, LaiZ. Evaluation of microstructural development in electron beam melted Ti-6Al-4V [J]. Materials Characterization, 2012, 658-15

[34] PattersonA L. The Scherrer Formula for X-ray particle size determination [J]. Physical Review, 1939, 56(10): 978-982

[35] LohL E, ChuaC K, YeongW Y, SongJ, MaparM, SingS L, LiuZ-h, ZhangD-qing. Numerical investigation and an effective modelling on the selective laser melting (SLM) process with aluminium alloy 6061 [J]. International Journal of Heat and Mass Transfer, 2015, 80: 288-300

[36] PrashanthK G, DamodaramR, MaityT, WangP, EckertJ. Friction welding of selective laser melted Ti6Al4V parts [J]. Materials Science and Engineering A, 2017, 704: 66-71

[37] LuetjeringG, WilliamsJ CTitanium [M], 2003, Berlin, Springer

[38] DobromyslovA V, ElkinV A. Martensitic transformation and metastable beta-phase in binary titanium alloys with d-metals of 4–6 periods [J]. Scripta Materialia, 2001, 44(6): 905-910

[39] LiuZ, WelschG. Literature survey on diffusivities of oxygen, aluminum, and vanadium in alpha titanium, beta titanium, and in rutile [J]. Metallurgical Transactions A, 1988, 19(4): 1121-1125

[40] Ehtemam-HaghighiS, LiuY-j, CaoG-h, ZhangL-chang. Phase transition, microstructural evolution and mechanical properties of Ti-Nb-Fe alloys induced by Fe addition [J]. Materials & Design, 2016, 97: 279-286