The solid solution and aging treatment for conventional manufacturing processes might not be suitable for laser additive manufactured titanium alloys due to the different lamellar microstructures. In this study, the influence of aging temperatures (600, 700 and 800 °C) on microstructure and mechanical properties of titanium alloy Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si was investigated. The results indicate that after solid solution treatment at 970 °C followed by water quenching, the alloy mainly consists of coarsening lamellar α phase in martensite α′ matrix. Aging at 600 °C will not change the size of primary lamellar α phase but lead to huge amount of secondary α phases (αs) generating with very fine microstructure. By increasing the aging temperature, the number of αs decreases but with coarsened microstructures. When aged at 800 °C, the width of the αs phase reaches 350 nm, almost 7 times wider than that aged at 600 °C. The changing size of αs obviously influences the property of the alloy. The fine αs leads to high strength and microhardness but low plasticity, and specimen aged at 700 °C with suitable αs size has the best comprehensive properties.
α + β titanium alloy Laser additive manufacturing Solid solution and aging treatment Microstructure Room temperature tensile property
This is a preview of subscription content, log in to check access.
This study was financially supported by the Beijing Municipal Science and Technology Project (No. Z171100000817002), the Young Elite Scientist Sponsorship Program by CAST and the National Key Research and Development Program of China (No. 2016YFB1100401).
Leyens C, Peter M. Titanium and Titanium Alloys. Weinheim: Die Deutsche Bibliothek; 2006. 18.Google Scholar
Eyers DR, Potter AT. Industrial additive manufacturing: a manufacturing systems perspective. Comput Ind. 2017;92–93:208.CrossRefGoogle Scholar
Tian XJ, Zhang SQ, Li A, Wang HM. Effect of annealing temperature on the notch impact toughness of a laser melting deposited titanium alloy Ti–4Al–1.5Mn. Mater Sci Eng A. 2010;527(7-8):1821.CrossRefGoogle Scholar
Li C, Chen J, Li W, Ren YJ, He JJ, Song ZX. Effect of heat treatment variations on the microstructure evolution and mechanical properties in a β metastable Ti alloy. J Alloys Compd. 2016;684:466.CrossRefGoogle Scholar
Keist JS, Palmer TA. Role of geometry on properties of additively manufactured Ti–6Al–4V structures fabricated using laser based directed energy deposition. Mater Des. 2016;106:482.CrossRefGoogle Scholar
Luo J, Ye P, Li MQ, Liu LY. Effect of the alpha grain size on the deformation behavior during isothermal compression of Ti–6Al–4V alloy. Mater Des. 2015;88:32.CrossRefGoogle Scholar
Mikler CV, Chaudhary V, Borkar T, Soni V, Jaeger D, Chen X, Contieri R, Ramanujan RV, Banerjee R. Laser additive manufacturing of magnetic materials. JOM. 2017;69(3):532.CrossRefGoogle Scholar
Kelly SM. Microstructural evolution in laser-deposited multilayer Ti–6Al–4V builds part 1: microstructural characterization. Metall Mater Trans A. 2004;35(6):1861.CrossRefGoogle Scholar
Sridharan N, Chaudhary A, Nandwana P, Babu SS. Texture evolution during laser direct metal deposition of Ti–6Al–4V. JOM. 2016;68(3):772.CrossRefGoogle Scholar
Lu Y, Tang HB, Fang YL, Liu D, Wang HM. Microstructure evolution of sub-critical annealed laser deposited Ti–6Al–4V alloy. Mater Des. 2012;37:56.CrossRefGoogle Scholar
Beese AM, Carroll BE. Review of mechanical properties of Ti–6Al–4V made by laser-based additive manufacturing using powder feedstock. JOM. 2016;68(3):724.CrossRefGoogle Scholar
Marshall GJ, Young WJ, Thompson SM, Shamsaei N, Daniewicz SR, Shao S. Understanding the microstructure formation of Ti–6Al–4V during direct laser deposition via in-situ thermal monitoring. JOM. 2016;68(3):778.CrossRefGoogle Scholar
Zhu Y, Liu D, Tian X, Tang H, Wang H. Characterization of microstructure and mechanical properties of laser melting deposited Ti–6.5Al–3.5Mo–1.5Zr–0.3Si titanium alloy. Mater Des. 2014;56:445.CrossRefGoogle Scholar
Liu CM, Wang HM, Tian XJ, Tang HB, Liu D. Microstructure and tensile properties of laser melting deposited Ti–5Al–5Mo–5V–1Cr–1Fe near β titanium alloy. Mater Sci Eng A. 2013;586:323.CrossRefGoogle Scholar
Liu C, Yu L, Zhang A, Tian X, Liu D, Ma S. Beta heat treatment of laser melting deposited high strength near β titanium alloy. Mater Sci Eng A. 2016;673:185.CrossRefGoogle Scholar
Li GC, Li J, Tian XJ, Cheng X, He B, Wang HM. Microstructure and properties of a novel titanium alloy Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si manufactured by laser additive manufacturing. Mater Sci Eng A. 2017;684:233.CrossRefGoogle Scholar
Imayev VM, Gaisin RA, Gaisina ER, Imayev RM. Microstructure, processing and mechanical properties of a titanium alloy Ti–20Zr–6.5Al–3.3Mo–0.3Si–0.1B. Mater Sci Eng A. 2017;696:137.CrossRefGoogle Scholar
China Materials Engineering Canon. Nonferrous Metal Material Engineering. Beijing: Chemical Industry Press; 2006. 85.Google Scholar
1.National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and EngineeringBeihang UniversityBeijingChina