Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 10, Pages 3257-3264Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63465-8
Keywords
large diameter thin-walled CP-Ti bent tube; warm bending; texture; twinning; deformation mechanism
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Funding
- National Natural Science Foundation of China [50905144, 51275415]
- Program for New Century Excellent Talents in University, China
- Program of Introducing Talents of Discipline to Universities, China (111 Project) [B08040]
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In order to develop the warming bending technology of the large diameter thin-walled (LDTW) commercial pure titanium alloy CP-Ti tubes, the warm bending mechanism of the extrados and intrados of LDTW CP-Ti tubes was researched. By EBSD analysis and Vickers hardness test, the changes of microstructure and strength of the tubes at different bending temperatures of 293, 423 and 573 K, were analyzed. The results show: 1) The extrados of the bent tube deforms mainly by slip, along with few twinning, and the preferred orientation is similar to that of the initial tube; the intrados of the bent tube experiences compression deformation mainly by {10 (1) over bar2} tensile twinning, and the twinning makes the preferred orientation of wall materials change sharply. 2) The Vickers hardness values of both the extrados and intrados of the samples after bending increase greatly; the Vickers hardness values of the intrados are much higher than those of the extrados, and Vickers hardness values of the RD-TD planes are always higher than those of the RD-LD planes, which are related to the different deformation mechanisms.
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