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Materials 2016, 9(11), 872; doi:10.3390/ma9110872

Evaluation of Subsequent Heat Treatment Routes for Near-β Forged TA15 Ti-Alloy

State Key Lab of Solidification Processing, Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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Academic Editor: Shankar M.L. Sastry
Received: 14 August 2016 / Revised: 20 October 2016 / Accepted: 21 October 2016 / Published: 26 October 2016
(This article belongs to the Special Issue Physical Metallurgy of High Performance Alloys)
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Abstract

TA15 Ti-alloy is widely used to form key load-bearing components in the aerospace field, where excellent service performance is needed. Near-β forging technology provides an attractive way to form these complicated Ti-alloy components but subsequent heat treatment has a great impact on the final microstructure and mechanical properties. Therefore evaluation and determination of the heat treatment route is of particular significance. In this paper, for the near-β forged TA15 alloy, the formation and evolution of microstructures under different subsequent heat treatment routes (annealing, solution and aging, toughening and strengthening) were studied and the cooling mode after forging was also considered. Then, the type and characteristics of the obtained microstructures were discussed through quantitative metallographic analysis. The corresponding mechanical properties (tensile, impact toughness, and fracture toughness) and effects of microstructural characteristics were investigated. Finally, for a required microstructure and performance a reasonable heat treatment route was recommended. The work is of importance for the application and development of near-β forging technology. View Full-Text
Keywords: TA15 Ti-alloy; near-β forging; heat treatment; microstructural characteristic; mechanical properties TA15 Ti-alloy; near-β forging; heat treatment; microstructural characteristic; mechanical properties
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Sun, Z.; Wu, H.; Yang, H. Evaluation of Subsequent Heat Treatment Routes for Near-β Forged TA15 Ti-Alloy. Materials 2016, 9, 872.

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