Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of as-cast Ti60 titanium alloy

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	Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of as-cast Ti60 titanium alloy
	W. W. Peng; W. D. Zeng; Q. J. Wang; Q. Y. Zhao; H. G. Yu
	2014
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	593 页码:16-23
摘要	Effects of the processing parameters on the flow stress behavior and the microstructural revolution are investigated in the hot compression of as-cast Ti60 alloy. The flow stress behavior reveals greater flow softening in the two-phase field compared with that of single-phase field. In the two-phase field, flow softening is caused by break-up of lamellar alpha, deformation heating, flow localization and free-surface cracking. While in the single-phase field, flow softening is associated with dynamic recovery and recrystallization. In addition, the flow stress curves display discontinuous yielding, which is attributed to rapid dislocation generation and multiplication from the grain boundary. Moreover, the magnitude of yield drop is inversely proportional to the average grain size. In the alpha+beta phase field, the distorted degree of lamellar alpha within the prior beta grains increases with increasing strain rate and reduction, while flow instability including low localization and oxidation cracking occurs in higher strain rate (>1 s(-1)) and larger reduction (>60%), a small amount of recrystallized grains are observed at the prior beta grain boundaries in lower strain rates (<= 0.1 s(-1)) with reduction of 60%. In the beta phase field, however, the concentration of recrystallized p grains at prior beta grain boundaries is much higher than that observed during deformation in the alpha+beta phase field. The fraction of recrystallized beta grains increases with increasing temperature, reduction and decreasing strain rate. It indicates that the processing parameters have a significant influence on the deformation behavior and microstructural revolution of as-cast Ti60 titanium alloy. It is helpful for the controlling of the microstructure and the optimization of processing parameters. (C) 2013 Elsevier B.V. All rights reserved.
部门归属	[peng, wenwen ; zeng, weidong ; yu, hanging] northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china. [wang, qingjiang] chinese acad sci, inst met res, shenyang 110016, peoples r china. [zhao, qinyang] univ sci & technol beijing, sch mat sci & engn, beijing 100083, peoples r china. ; zeng, wd (reprint author), northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china. ; zengwd@nwpu.edu.cn
关键词	As-cast Ti60 Titanium Alloy Flow Softening Discontinuous Yielding Microstructural Evolution Working Ti-6al-4v Temperature Map Imi-834 Imi834
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72567
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. W. Peng,W. D. Zeng,Q. J. Wang,et al. Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of as-cast Ti60 titanium alloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2014,593:16-23.
APA	W. W. Peng,W. D. Zeng,Q. J. Wang,Q. Y. Zhao,&H. G. Yu.(2014).Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of as-cast Ti60 titanium alloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,593,16-23.
MLA	W. W. Peng,et al."Effect of processing parameters on hot deformation behavior and microstructural evolution during hot compression of as-cast Ti60 titanium alloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 593(2014):16-23.