Microstructure coarsening behavior of Ti-17 alloy with equiaxed alpha during heat treatment

被引：30
作者：
Xu, Jianwei [1 ]
Zeng, Weidong [1 ]
Jia, Zhiqiang [1 ]
Sun, Xin [1 ]
Zhou, Jianhua [2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Baoshan Iron & Steel Co Ltd, Shanghai 200940, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 618卷
基金：
高等学校博士学科点专项科研基金;
关键词：
Ti-17; alloy; Microstructure coarsening; Quantitative analysis; Heat treatment; GRAIN-GROWTH KINETICS; CONVENTIONAL TITANIUM-ALLOY; TIAL-BASED ALLOYS; LAMELLAR MICROSTRUCTURE; STATIC GLOBULARIZATION; BETA-PHASE; TI-6AL-4V; MECHANISMS; SPHEROIDIZATION; TI-6AL-2SN-4ZR-2MO-0.1SI;
D O I：
10.1016/j.jallcom.2014.08.223
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Static coarsening behavior of Ti-17 alloy with equiaxed alpha microstructure was investigated. For this purpose, Ti-17 billet with a fully lamellar alpha microstructure was firstly forged in the two-phase field to break down the lamellar alpha structure. Then alpha/beta heat treatments were conducted at temperatures of 820 degrees C and 860 degrees C for times range from 10 min to 8 h followed by water quenching. Microstructure observations showed that alpha particle size increased with time during heat treatment, and it was more apparent at the higher temperature. Microstructure coarsening behavior during static heat treatment was analyzed by quantitative metallography. Quantitative analysis indicated that the rate of static coarsening decreases with heat treatment time. The coarsening of Ti-17 alloy with equiaxed alpha during heat treatment followed (r) over bar (3)(alpha) - (r) over bar (3)(alpha 0) vs t - t(0) kinetics, which is a classical bulk diffusion (volume-diffusion-controlled) behavior. Static coarsening behavior of Ti-17 alloy in this paper could be interpreted in terms of the modified Lifshitz-Slyosov-Wagner (LSW) theory. Furthermore, the coarsening rate constant during static heat treatment could be reasonably predicted by the modified Lifshitz-Slyosov-Wagner (LSW) theory. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：343 / 348
页数：6
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