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Materials 2017, 10(9), 1071; doi:10.3390/ma10091071

Influence of Hot Rolling and Heat Treatment on the Microstructural Evolution of β20C Titanium Alloy

1,2
,
1,2
,
1,2,* and 1,2
1
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2
National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Received: 15 August 2017 / Revised: 1 September 2017 / Accepted: 1 September 2017 / Published: 12 September 2017
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [22155 KB, uploaded 12 September 2017]   |  

Abstract

The microstructural evolution and underlying mechanism of a new high strength, high toughness near β titanium alloy, β20C, during hot deformation, and heat treatment were studied qualitatively and quantitatively. It was found that dynamic recovery occurs mainly in β phase, while α phase undergoes both a dynamic recovery and continuous incomplete dynamic recrystallization with a fraction of high-angle grain boundaries (≥15°) of 21.1% under hot-rolling. Subsequently, α phase undergoes static recrystallization with an increasing fraction of high-angle grain boundaries (21.1%→60.7%) under annealing, while the grains are equiaxed with refined grain sizes of 1.63 µm observed from the rolling direction (RD) and 1.66 µm observed from the transverse direction (TD). Moreover, the average aspect ratio of the lamellar α phase was 2.44 observed from the RD and 3.12 observed from the TD after hot rolling, but decreased to 2.20 observed from the RD, and 2.53 observed from the TD after annealing. Furthermore, the strict Burgers’ relationship between α and β phases changed after hot-rolling and remains the distortion, even after the static recrystallization process of α phase during annealing. View Full-Text
Keywords: β20C titanium alloy; microstructural evolution; EBSD β20C titanium alloy; microstructural evolution; EBSD
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Liu, X.; Yu, D.; Fan, Q.; Shi, R. Influence of Hot Rolling and Heat Treatment on the Microstructural Evolution of β20C Titanium Alloy. Materials 2017, 10, 1071.

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