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Influence of Different Cooling Mediums on βα Phase Transformation Microstructure and Texture in Commercially Pure Ti
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1.International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2.Panzhihua Iron and Steel Research Institute, Chengdu 610031, China

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Fund Project:

National Natural Science Foundation of China (51421001); Fundamental Research Funds for the Central Universities (2020CDJDPT001)

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    Abstract:

    The effect of cooling medium on microstructure evolution, variant selection and texture inheritance along with mechanical properties in a recrystallized commercially pure Ti sheet after β-solution treatment was investigated by combined use of optical microscopy (OM), electron channeling contrast (ECC) imaging, electron backscatter diffraction (EBSD) techniques, transmission electron microscopy (TEM) and micro-hardness test. It is found that with the decrease of cooling rate, fine needle-like α′ martensite (in water and liquid nitrogen), Widmanst?tten (in air), and coarse-grain microstructures (in furnace) are observed in turn. Additionally, the faster cooling rate results in a finer transformed structure accompanied with an attendant higher hardness value. Analyses for crystallographic orientations reveal that the Burgers orientation relationship (BOR) is strictly obeyed during the βα cooling except for the β-furnace-cooled specimen with appearance of other misorientations disobeying the BOR. As for texture characteristics, firstly, the texture distribution is largely scattered compared with the initial one and new orientation components of <0001>//TD and <>//ND appear upon the water and liquid nitrogen quenching. Secondly, the texture inheritance phenomenon occurs in furnace cooling condition because of stronger variant selection, then leading to a stronger transformation texture. Results suggest that raising cooling rates can be more feasible to weaken the transformation texture by suppressing the variant selection.

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[Yang Xiaoling, Wang Ying, Peng Lin, Li Jun, Luan Baifeng. Influence of Different Cooling Mediums on βα Phase Transformation Microstructure and Texture in Commercially Pure Ti[J]. Rare Metal Materials and Engineering,2022,51(6):1957~1963.]
DOI:10.12442/j. issn.1002-185X.20210316

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History
  • Received:April 12,2021
  • Revised:June 23,2021
  • Adopted:July 09,2021
  • Online: June 29,2022
  • Published: June 29,2022