On the role of cooling rate and temperature in forming twinned α’ martensite in Ti–6Al–4V

Sheng Cao; Bohua Zhang; Yi Yang; Qingbo Jia; Lei Li; Shewei Xin; Xinhua Wu; Qiaodan Hu; Chao Voon Samuel Lim

doi:10.1016/j.jallcom.2019.152247

On the role of cooling rate and temperature in forming twinned α’ martensite in Ti–6Al–4V

Sheng Cao, Bohua Zhang, Yi Yang, Qingbo Jia, Lei Li, Shewei Xin, Xinhua Wu, Qiaodan Hu, Chao Voon Samuel Lim

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

3 Citations (Scopus)

Abstract

Quenching experiments having different cooling rates up to 1.6 × 10⁴ ˚C/s were applied on rolled Ti–6Al–4V sheets. Twins were not observed in the condition with a low cooling rate. With an increased quenching rate to the order of 10⁴ ˚C/s, {101¯1} twins were formed in the temperature range of 550–850 °C, and {101¯2} twins were activated at an even lower temperature range. These observations offer insights into the mechanism of twinned martensite formation for selective laser melted Ti–6Al–4V by considering the alternating thermal stress and fast cooling from decreasing peak temperatures in selective laser melting thermal cycles.

Original language	English
Article number	152247
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	813
DOIs	https://doi.org/10.1016/j.jallcom.2019.152247
Publication status	Published - 15 Jan 2020

Keywords

Quenching
Titanium alloys
Transmission electron microscopy
Twinning

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10.1016/j.jallcom.2019.152247

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Cite this

@article{93b7ae020cd14e74ba1cb45b26117945,

title = "On the role of cooling rate and temperature in forming twinned α{\textquoteright} martensite in Ti–6Al–4V",

abstract = "Quenching experiments having different cooling rates up to 1.6 × 104 ˚C/s were applied on rolled Ti–6Al–4V sheets. Twins were not observed in the condition with a low cooling rate. With an increased quenching rate to the order of 104 ˚C/s, {101¯1} twins were formed in the temperature range of 550–850 °C, and {101¯2} twins were activated at an even lower temperature range. These observations offer insights into the mechanism of twinned martensite formation for selective laser melted Ti–6Al–4V by considering the alternating thermal stress and fast cooling from decreasing peak temperatures in selective laser melting thermal cycles.",

keywords = "Quenching, Titanium alloys, Transmission electron microscopy, Twinning",

author = "Sheng Cao and Bohua Zhang and Yi Yang and Qingbo Jia and Lei Li and Shewei Xin and Xinhua Wu and Qiaodan Hu and Lim, {Chao Voon Samuel}",

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doi = "10.1016/j.jallcom.2019.152247",

language = "English",

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journal = "Journal of Alloys and Compounds",

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T1 - On the role of cooling rate and temperature in forming twinned α’ martensite in Ti–6Al–4V

AU - Cao, Sheng

AU - Zhang, Bohua

AU - Yang, Yi

AU - Jia, Qingbo

AU - Li, Lei

AU - Xin, Shewei

AU - Wu, Xinhua

AU - Hu, Qiaodan

AU - Lim, Chao Voon Samuel

PY - 2020/1/15

Y1 - 2020/1/15

N2 - Quenching experiments having different cooling rates up to 1.6 × 104 ˚C/s were applied on rolled Ti–6Al–4V sheets. Twins were not observed in the condition with a low cooling rate. With an increased quenching rate to the order of 104 ˚C/s, {101¯1} twins were formed in the temperature range of 550–850 °C, and {101¯2} twins were activated at an even lower temperature range. These observations offer insights into the mechanism of twinned martensite formation for selective laser melted Ti–6Al–4V by considering the alternating thermal stress and fast cooling from decreasing peak temperatures in selective laser melting thermal cycles.

AB - Quenching experiments having different cooling rates up to 1.6 × 104 ˚C/s were applied on rolled Ti–6Al–4V sheets. Twins were not observed in the condition with a low cooling rate. With an increased quenching rate to the order of 104 ˚C/s, {101¯1} twins were formed in the temperature range of 550–850 °C, and {101¯2} twins were activated at an even lower temperature range. These observations offer insights into the mechanism of twinned martensite formation for selective laser melted Ti–6Al–4V by considering the alternating thermal stress and fast cooling from decreasing peak temperatures in selective laser melting thermal cycles.

KW - Quenching

KW - Titanium alloys

KW - Transmission electron microscopy

KW - Twinning

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