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Metals 2017, 7(3), 99; doi:10.3390/met7030099

The Effects of Prestrain and Subsequent Annealing on Tensile Properties of CP-Ti

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China
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Academic Editor: Mark T. Whittaker
Received: 14 February 2017 / Revised: 12 March 2017 / Accepted: 14 March 2017 / Published: 17 March 2017
(This article belongs to the Special Issue Titanium Alloys 2017)
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Abstract

The aim of the present work is to investigate the effects of prestrain and subsequent annealing on tensile properties of commercial pure titanium (CP-Ti). According to tensile test results, yield strength and ultimate tensile strength increase with the increase of prestrain. Elongation and uniform strain decrease linearly with prestrain. In the case of prestrain that is higher than 3.5%, the macro-yield of specimens changes from gradual yielding to discontinuous yielding. It is supposed that considerable numbers of dislocations introduced into the material lead to the appearance of yield plateau. The quantitative analysis of the contribution of dislocation hardening to the strain hardening shows that dislocation-associated mechanisms play an important role in strain hardening. Moreover, a modified Fields-Backofen model is proposed to predict the flow stress of prestrained CP-Ti at different strain rates. Both strain rate sensitivity and strain hardening exponent decrease with prestrain. Fracture surfaces of the specimens show that fracture mechanism of all tested specimens is dimple fracture. The more ductile deformation in prestrained CP-Ti after annealing indicates that its ductility is improved by annealing. View Full-Text
Keywords: CP-Ti; prestrain; yield plateau; tensile properties; flow stress; fracture CP-Ti; prestrain; yield plateau; tensile properties; flow stress; fracture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chang, L.; Zhou, C.-Y.; He, X.-H. The Effects of Prestrain and Subsequent Annealing on Tensile Properties of CP-Ti. Metals 2017, 7, 99.

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