Microstructure and texture evolution in double-cone samples of Ti6Al4V alloy with colony preform microstructure

Kun Vanna Yang, Chao Voon Samuel Lim, Kai Zhang, Jifeng Sun, Xiaoguang Yang, Aijun Huang, Xinhua Wu, Chris H. Davies

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Heat-treated Ti-6Al-4V forged bar with colony microstructure was machined into double- cone-shaped samples for a series of isothermal uniaxial compression test at 1223 K (950 C) with varying constant crosshead speeds of 12.5, 1.25, and 0.125 mms1 to a height reduction of 70 pct. Another set of samples deformed under the same conditions were heat treated at 1173 K (900 C) for an hour followed by water quench. Finite element modeling was used to provide the strains, strain rates, and temperature profiles of the hot compression samples, and the microstructure and texture evolution was examined at four positions on each sample, representative of different strain ranges. Lamellae fragmentation and kinking are the dominant microstructural features at lower strain range up to a maximum of 2.0, whereas globularization dominates at strains above 2.0 for the as-deformed samples. The globularization fraction generally increases with strain, or by post-deformation heat treatment, but fluctuates at lower strain. The grain size of the globular a is almost constant with strain and maximizes for samples with the lowest crosshead speed due to the longer deformation time. The globular a grain also coarsens because of post-deformation heat treatment, with its size increasing with strain level. With respect to texture evolution, a basal transverse ring and another component 30 deg from ND is determined for samples deformed at 12.5 mms1, which is consistent with the temperature increase to close to b-transus from simulation results. The texture type remains
unchanged with its intensity increased and spreads with increasing strain.
Original languageEnglish
Pages (from-to)5989-6002
Number of pages14
JournalMetallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Volume46A
Issue number12
DOIs
Publication statusPublished - Dec 2015

Cite this

@article{b9809f04822d4077bd97659fe6ec4e29,
title = "Microstructure and texture evolution in double-cone samples of Ti6Al4V alloy with colony preform microstructure",
abstract = "Heat-treated Ti-6Al-4V forged bar with colony microstructure was machined into double- cone-shaped samples for a series of isothermal uniaxial compression test at 1223 K (950 C) with varying constant crosshead speeds of 12.5, 1.25, and 0.125 mms1 to a height reduction of 70 pct. Another set of samples deformed under the same conditions were heat treated at 1173 K (900 C) for an hour followed by water quench. Finite element modeling was used to provide the strains, strain rates, and temperature profiles of the hot compression samples, and the microstructure and texture evolution was examined at four positions on each sample, representative of different strain ranges. Lamellae fragmentation and kinking are the dominant microstructural features at lower strain range up to a maximum of 2.0, whereas globularization dominates at strains above 2.0 for the as-deformed samples. The globularization fraction generally increases with strain, or by post-deformation heat treatment, but fluctuates at lower strain. The grain size of the globular a is almost constant with strain and maximizes for samples with the lowest crosshead speed due to the longer deformation time. The globular a grain also coarsens because of post-deformation heat treatment, with its size increasing with strain level. With respect to texture evolution, a basal transverse ring and another component 30 deg from ND is determined for samples deformed at 12.5 mms1, which is consistent with the temperature increase to close to b-transus from simulation results. The texture type remainsunchanged with its intensity increased and spreads with increasing strain.",
author = "Yang, {Kun Vanna} and Lim, {Chao Voon Samuel} and Kai Zhang and Jifeng Sun and Xiaoguang Yang and Aijun Huang and Xinhua Wu and Davies, {Chris H.}",
year = "2015",
month = "12",
doi = "10.1007/s11661-015-3158-z",
language = "English",
volume = "46A",
pages = "5989--6002",
journal = "Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science",
issn = "1073-5623",
publisher = "Springer",
number = "12",

}

Microstructure and texture evolution in double-cone samples of Ti6Al4V alloy with colony preform microstructure. / Yang, Kun Vanna; Lim, Chao Voon Samuel; Zhang, Kai; Sun, Jifeng; Yang, Xiaoguang; Huang, Aijun; Wu, Xinhua; Davies, Chris H.

In: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Vol. 46A, No. 12, 12.2015, p. 5989-6002.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Microstructure and texture evolution in double-cone samples of Ti6Al4V alloy with colony preform microstructure

AU - Yang, Kun Vanna

AU - Lim, Chao Voon Samuel

AU - Zhang, Kai

AU - Sun, Jifeng

AU - Yang, Xiaoguang

AU - Huang, Aijun

AU - Wu, Xinhua

AU - Davies, Chris H.

PY - 2015/12

Y1 - 2015/12

N2 - Heat-treated Ti-6Al-4V forged bar with colony microstructure was machined into double- cone-shaped samples for a series of isothermal uniaxial compression test at 1223 K (950 C) with varying constant crosshead speeds of 12.5, 1.25, and 0.125 mms1 to a height reduction of 70 pct. Another set of samples deformed under the same conditions were heat treated at 1173 K (900 C) for an hour followed by water quench. Finite element modeling was used to provide the strains, strain rates, and temperature profiles of the hot compression samples, and the microstructure and texture evolution was examined at four positions on each sample, representative of different strain ranges. Lamellae fragmentation and kinking are the dominant microstructural features at lower strain range up to a maximum of 2.0, whereas globularization dominates at strains above 2.0 for the as-deformed samples. The globularization fraction generally increases with strain, or by post-deformation heat treatment, but fluctuates at lower strain. The grain size of the globular a is almost constant with strain and maximizes for samples with the lowest crosshead speed due to the longer deformation time. The globular a grain also coarsens because of post-deformation heat treatment, with its size increasing with strain level. With respect to texture evolution, a basal transverse ring and another component 30 deg from ND is determined for samples deformed at 12.5 mms1, which is consistent with the temperature increase to close to b-transus from simulation results. The texture type remainsunchanged with its intensity increased and spreads with increasing strain.

AB - Heat-treated Ti-6Al-4V forged bar with colony microstructure was machined into double- cone-shaped samples for a series of isothermal uniaxial compression test at 1223 K (950 C) with varying constant crosshead speeds of 12.5, 1.25, and 0.125 mms1 to a height reduction of 70 pct. Another set of samples deformed under the same conditions were heat treated at 1173 K (900 C) for an hour followed by water quench. Finite element modeling was used to provide the strains, strain rates, and temperature profiles of the hot compression samples, and the microstructure and texture evolution was examined at four positions on each sample, representative of different strain ranges. Lamellae fragmentation and kinking are the dominant microstructural features at lower strain range up to a maximum of 2.0, whereas globularization dominates at strains above 2.0 for the as-deformed samples. The globularization fraction generally increases with strain, or by post-deformation heat treatment, but fluctuates at lower strain. The grain size of the globular a is almost constant with strain and maximizes for samples with the lowest crosshead speed due to the longer deformation time. The globular a grain also coarsens because of post-deformation heat treatment, with its size increasing with strain level. With respect to texture evolution, a basal transverse ring and another component 30 deg from ND is determined for samples deformed at 12.5 mms1, which is consistent with the temperature increase to close to b-transus from simulation results. The texture type remainsunchanged with its intensity increased and spreads with increasing strain.

UR - https://link.springer.com/article/10.1007%2Fs11661-015-3158-z

U2 - 10.1007/s11661-015-3158-z

DO - 10.1007/s11661-015-3158-z

M3 - Article

VL - 46A

SP - 5989

EP - 6002

JO - Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science

SN - 1073-5623

IS - 12

ER -