《Aging response of laser melting deposited Ti–6Al–2Zr–1Mo–1V alloy》.pdf

Materials Science Engineering A 560 (2013) 193–199 Contents lists available at SciVerse ScienceDirect Materials Science Engineering A journal homepage: /locate/msea Aging response of laser melting deposited Ti–6Al–2Zr–1Mo–1V alloy J. Li, H.M. Wang n Engineering Research Center of Ministry of Education on Laser Direct Manufacturing of Large Metallic Components, School of Materials Science and Engineering, Beihang University (formerly Beijing University of Aeronautics and Astronautics), 37 Xueyuan Road, Beijing 100191, China a r t i c l e i n f o a b s t r a c t Article history: Laser melting deposited Ti–6Al–2Zr–1Mo–1V alloy was isothermally aged in the a þ b phase region Received 23 May 2012 after a b solution treatment. A special microstructure consisting of crisscross a lamellas and dispersedly Received in revised form distributed b precipitates is obtained by aging below the Ms of the alloy. b solution treatment and 12 September 2012 water quenching result in hexagonal a0 martensite structure. During subsequent aging treatments, Accepted 14 September 2012 0 densely dispersed fine b precipitates nucleate heterogeneously inside a martensite plates and at plate- Available online 23 September 2012 plate interfaces, with the variant formation is strongly restricted. The fine b precipitates grow and