Decomposition Kinetics of Metastable β Phase in Ti-1300 Alloy Under Isothermal Conditions

被引：0

作者：

Wan, Mingpan ^{[1
]}

Zeng, Yujin ^{[1
]}

Tan, Yuanbiao ^{[1
]}

Huang, Chaowen ^{[1
]}

Zhao, Yongqing ^{[2
]}

机构：

[1] Guizhou University, College of Materials and Metallurgy, Guiyang,550025, China

[2] Northwest Institute for Nonferrous Metal Research, Xi'an,710016, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2019年 / 48卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Isotherms - Integral equations - Titanium alloys - Kinetics;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Phase transformation kinetics of Ti-1300 alloy after solution treatment were investigated under isothermal conditions in the temperature range of 400℃ to 700℃ by dilatometric method. The decomposition kinetic equation of metastable β phase in the alloy was constructed under isothermal conditions by analyzing the experimental data in the theoretical frame of the Johnson-Mehl-Avrami (JMA) theory. The different values of K and n parameters were obtained in the temperature range of 400℃ to 420℃ and 500℃ to 700℃, indicating that the mechanism of the phase transformation is different in different temperature ranges. The decomposition mechanism of metastable β phase is βm→β'+β→α+β at the temperature of 400℃ to 420℃, whereas the decomposition mechanism of metastable β phase is βm→α+β at the temperature of 500℃ to 700℃. When the metastable β phase of Ti-1300 alloy was annealed isothermally at a given temperature, the amount of α phase increases firstly, and then reaches a stable value with increasing the holding time. Based on calculation and experimental results, time-temperature-transformation diagrams (TTT diagram) of Ti-1300 alloys were plotted for the metastable β phase decomposition under isothermal conditions from 500℃ to 700℃. And the nose temperature of the TTT diagram of the alloy is around 600℃ for the Ti-1300 alloys. Copyright © 2019, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

引用

页码：3855 / 3862