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Article

Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage

1
College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2
National Engineering Research Center for Equipment and Technology of Cold Steel Rolling, Qinhuangdao 066004, China
3
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(9), 968; https://doi.org/10.3390/met9090968
Received: 18 July 2019 / Revised: 21 August 2019 / Accepted: 31 August 2019 / Published: 3 September 2019
In order to understand the non-isothermal transformation behavior of Ti-6Al-4V titanium alloy in the continuous heating stage of solution treatment, thermal dilatometry tests with heating rates of 0.1~0.8 °C/s were designed. The conversion between the expansion amount and the transformed volume fraction was realized by the lever principle, and the transformation characteristics of α + β → β were quantified based on the Kissinger-Akahira-Sunose (KAS) theory and the modified Johnson–Mehl–Avrami (JMA) model. The results show that the phase transformation kinetics curves present typical “S” patterns, and the element diffusion transformation controls the nucleation and growth of new grains during the transformation of α + β → β. The phase transformation interval gradually moves to high temperature regions with the increase of heating rates, and the phase transformation activation energy is 445.5 kJ·mol−1. The phase transformation process is divided into three stages according to the relationship between the Avrami exponent n and the transformed volume fraction fT. These three stages correspond to different stages of grain nucleation or growth. View Full-Text
Keywords: Ti-6Al-4V; solution treatment; non-isothermal dilatometry; JMA model; transformation kinetics Ti-6Al-4V; solution treatment; non-isothermal dilatometry; JMA model; transformation kinetics
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MDPI and ACS Style

Yu, H.; Li, W.; Zou, H.; Li, S.; Zhai, T.; Liu, L. Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage. Metals 2019, 9, 968. https://doi.org/10.3390/met9090968

AMA Style

Yu H, Li W, Zou H, Li S, Zhai T, Liu L. Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage. Metals. 2019; 9(9):968. https://doi.org/10.3390/met9090968

Chicago/Turabian Style

Yu, Hui, Wei Li, Haibei Zou, Songsong Li, Tongguang Zhai, and Ligang Liu. 2019. "Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage" Metals 9, no. 9: 968. https://doi.org/10.3390/met9090968

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