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Acta Metall Sin  2014, Vol. 50 Issue (6): 707-714    DOI: 10.3724/SP.J.1037.2014.00003
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LI Kai 1), YANG Ping 1), SHA Aixue 2), YAN Mengqi 2)
1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2) Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095
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Abstract  To understand the differences in the mechanical properties between the center and surface regions of large size forged TC18 titanium alloy bar, electron backscatter diffraction (EBSD) technique is applied to reveal the differences in textures and strains in b phase in addition to the microstructures observation. The influence of the states of b phase on the deviation to the Burgers orientation relationship (OR) between a /b phases is also analyzed according to the acquired EBSD information. It is found that the b phases in different positions of forged bar are in different states of strain, textures and grain sizes. The b phase in the center shows strong <100> texture and coarse and inhomogeneous grain sizes which all contribute to the difference in properties. The spheroidization of ap phase proceeded mainly within b grains at subgrain boundaries and the OR between two phases changed slightly as the lamella ap phase transforms into block-like ap phase, but changed strongly during transforming to globular morphology. The misorientation in b phase is an effective parameter to evaluate the contribution of work-hardening state for the enhancement of strength, whereas the level of the deviation to Burgers OR is an effective parameter to evaluate the spheroidizing rate and the recovery extent.
Key words:  titanium alloy      forging      texture      phase transformation     
Received:  02 January 2014     
ZTFLH:  TG146.23  
Corresponding Authors:  YANG Ping, professor, Tel: (010)82376968, E-mail:   

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