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Title:: Research on Anisotropy Regulation of TC4 Titanium Alloy Plate for Navy Application

Author(s):: HOU Zhimin; YAN Xincheng; LIANG Shuhua; KANG Yan; XIE Wenlong; LI Changzheng; WANG Yu; LI Wei; 1.Xi’an University of Technology, Xi’an 710048, China 2.Western Titanium Technologies Co., Ltd, Xi’an 710201, China

Keywords:: TC4 titanium alloy; annealing heat treatment; recrystallization; microstructure; strengthductility matching

CLC:

PACS:: TG146.23

DOI:: 10.7502/j.issn.1674-3962.202506010

DocumentCode:

Abstract:: In response to the development requirements for super-large TC4 titanium alloy plates utilized in shipbuilding fields, certain plates can only be fabricated through unidirectional rolling technology. However, this rolling method tends to produce a B/T texture predominantly characterized by T texture, resulting in pronounced anisotropy. This study investigates the influence of unidirectional rolling deformation degrees on the microstructure and mechanical properties of TC4 titanium alloy subjected to heating and holding at 950 ℃. Additionally, the influence of annealing temperatures on the microstructure and mechanical performance is examined. The findings indicate that increasing rolling deformation enhances the material’s strength but also exacerbates the disparity between transverse and longitudinal mechanical properties. After annealing at 700 ℃, the microstructure primarily consists of deformed features. When the annealing temperature is elevated to the range of 800~850 ℃, substantial recrystallization occurs. Further increasing the temperature above 900 ℃ leads to a marked reduction in the primary α phase content and a pronounced precipitation of the secondary α phase. The tensile strength of the hot-rolled TC4 alloy sheet with a thickness of 20 mm can reach up to 1030 MPa. As the annealing temperature rises, strength decreases while ductility improves, attributed to recovery and partial recrystallization processes. Notably, annealing at 900 ℃ makes TC4 alloy have good comprehensive mechanical properties, with tensile strength reaching 1025 MPa, elongation of 16%, and reduction of area of 43%, alongside an impact energy of 44 J, and the microstructure exhibiting weak texture characteristics. However, further increasing the annealing temperature to 950 ℃ significantly diminishes the primary α phase fraction, coarsens the microstructure, and reduces the alloys plasticity and toughness. By modulating the annealing temperature, it is possible to tailor the microstructure, texture type, and strength, thereby mitigating anisotropy and enhancing the overall mechanical performance of the TC4 titanium alloy sheets.

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Research on Anisotropy Regulation of TC4 Titanium Alloy Plate for Navy Application(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

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