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Characterization of high-temperature deformation behavior of as-cast Ti60 titanium alloy using processing map
W. W. Peng; W. D. Zeng; Q. J. Wang; H. G. Yu
2013
Source PublicationMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
Volume571Pages:116-122
AbstractIsothermal compression testing of as-cast Ti60 titanium alloy is carried out at the deformation temperature range of 970-1120 degrees C with 50 degrees C intervals, strain rate range of 0.01-10 s(-1) and height reduction of 75%. The hot deformation behavior of as-cast Ti60 titanium alloy is characterized based on the analysis of the stress-strain behavior, kinetics and the processing map. The constitutive equation of as-cast Ti60 titanium alloy is established, which describes the flow stress as a function of the strain rate and deformation temperature. The apparent activation energies are calculated to be 574.8 kJ/mol in the alpha+beta two-phase field and 194.0 kJ/mol in the beta single-phase field, respectively. Based on the dynamic material model and the Prasad's instability criterion, the processing maps for the alloy are constructed at strains of 0.4 and 0.7. The maps exhibit a stable domain in the temperature range of 970-1120 degrees C and strain rate range of 0.01-0.1 s(-1) with two peaks in power dissipation of 70% and 70%, occurring at 970 degrees C/0.01 s(-1) and 1120 degrees C/0.01 s(-1), respectively. The high efficiency values of power dissipation indicate dynamic recrystallization in these fields, and dynamic recrystallization fraction increases with increasing deformation temperature. Therefore, the optimal processing condition for cogging procedure of as-cast Ti60 titanium alloy is 1120 degrees C/0.01 s(-1). Moreover, the material also undergoes flow instabilities domain occurring at strain rates higher than 1 s(-1). This instability domain exhibits flow localization and cracking which should be avoided during hot processing in order to obtain the satisfactory properties. (C) 2013 Elsevier B.V. All rights reserved.
description.department[peng, wenwen ; zeng, weidong ; yu, hanging] northwestern polytech univ, state key lab solidificat proc, sch mat, xian 710072, peoples r china. [wang, qingjiang] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; zeng, wd (reprint author), northwestern polytech univ, state key lab solidificat proc, sch mat, xian 710072, peoples r china. ; zengwd@nwpu.edu.cn
KeywordAs-cast Ti60 Titanium Alloy Constitutive Relationship Processing Map Hot Deformation Behavior Hot-working Microstructure Evolution Ti40 Alloy Ti-6al-4v Compression Workability Hydrogen Flow
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71426
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
W. W. Peng,W. D. Zeng,Q. J. Wang,et al. Characterization of high-temperature deformation behavior of as-cast Ti60 titanium alloy using processing map[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2013,571:116-122.
APA W. W. Peng,W. D. Zeng,Q. J. Wang,&H. G. Yu.(2013).Characterization of high-temperature deformation behavior of as-cast Ti60 titanium alloy using processing map.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,571,116-122.
MLA W. W. Peng,et al."Characterization of high-temperature deformation behavior of as-cast Ti60 titanium alloy using processing map".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 571(2013):116-122.
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