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

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 vo...

Full description

Bibliographic Details
Main Authors:	Hui Yu, Wei Li, Haibei Zou, Songsong Li, Tongguang Zhai, Ligang Liu
Format:	Article
Language:	English
Published:	MDPI AG 2019-09-01
Series:	Metals
Subjects:	Ti-6Al-4V solution treatment non-isothermal dilatometry JMA model transformation kinetics
Online Access:	https://www.mdpi.com/2075-4701/9/9/968

id	doaj-1df43e1258584738b37f32019fe21e00
record_format	Article
spelling	doaj-1df43e1258584738b37f32019fe21e002020-11-25T01:33:29ZengMDPI AGMetals2075-47012019-09-019996810.3390/met9090968met9090968Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating StageHui Yu0Wei Li1Haibei Zou2Songsong Li3Tongguang Zhai4Ligang Liu5College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, ChinaCollege of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, ChinaCollege of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, ChinaCollege of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, ChinaDepartment of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USACollege of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, ChinaIn 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<sup>−1</sup>. The phase transformation process is divided into three stages according to the relationship between the Avrami exponent <i>n</i> and the transformed volume fraction <i>f</i><sub>T</sub>. These three stages correspond to different stages of grain nucleation or growth.https://www.mdpi.com/2075-4701/9/9/968Ti-6Al-4Vsolution treatmentnon-isothermal dilatometryJMA modeltransformation kinetics
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Hui Yu Wei Li Haibei Zou Songsong Li Tongguang Zhai Ligang Liu
spellingShingle	Hui Yu Wei Li Haibei Zou Songsong Li Tongguang Zhai Ligang Liu Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage Metals Ti-6Al-4V solution treatment non-isothermal dilatometry JMA model transformation kinetics
author_facet	Hui Yu Wei Li Haibei Zou Songsong Li Tongguang Zhai Ligang Liu
author_sort	Hui Yu
title	Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage
title_short	Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage
title_full	Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage
title_fullStr	Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage
title_full_unstemmed	Study on Non-Isothermal Transformation of Ti-6Al-4V in Solution Heating Stage
title_sort	study on non-isothermal transformation of ti-6al-4v in solution heating stage
publisher	MDPI AG
series	Metals
issn	2075-4701
publishDate	2019-09-01
description	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<sup>−1</sup>. The phase transformation process is divided into three stages according to the relationship between the Avrami exponent <i>n</i> and the transformed volume fraction <i>f</i><sub>T</sub>. These three stages correspond to different stages of grain nucleation or growth.
topic	Ti-6Al-4V solution treatment non-isothermal dilatometry JMA model transformation kinetics
url	https://www.mdpi.com/2075-4701/9/9/968
work_keys_str_mv	AT huiyu studyonnonisothermaltransformationofti6al4vinsolutionheatingstage AT weili studyonnonisothermaltransformationofti6al4vinsolutionheatingstage AT haibeizou studyonnonisothermaltransformationofti6al4vinsolutionheatingstage AT songsongli studyonnonisothermaltransformationofti6al4vinsolutionheatingstage AT tongguangzhai studyonnonisothermaltransformationofti6al4vinsolutionheatingstage AT ligangliu studyonnonisothermaltransformationofti6al4vinsolutionheatingstage
_version_	1725076858996785152

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

Similar Items