Microstructural evolution and mechanical properties of Ti6Al4V alloy prepared by the multi-pass hot caliber rolling at 700 °C and 800 °C with different reductions

被引：0
作者：
Chuan, Wu [1 ,2 ]
Fei, Meng Ya [1 ,2 ]
Xi, Liu Bao [3 ]
Tao, Huang [4 ]
机构：
[1] Tianjin Univ Technol & Educ, Natl Local Joint Engn Lab Intelligent Mfg Oriented, Tianjin 300222, Peoples R China
[2] Tianjin Key Lab High Performance Precis Forming Mf, Tianjin, Peoples R China
[3] Hebei Univ Technol, Res Inst Energy Equipment Mat, Sch Mat Sci & Engn, TianJin Key Lab Mat Laminating Fabricat & Interfac, Tianjin 300132, Peoples R China
[4] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471023, He Nan, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2025年 / 222卷
基金：
中国国家自然科学基金;
关键词：
Titanium alloy; Multi-pass hot caliber rolling; Ultra-fine fibrous; Mechanical properties; Thermo-mechanical coupled finite element; GRAINED TITANIUM; TI-6AL-4V ALLOY; FLOW BEHAVIOR; DEFORMATION; STRENGTH; TEMPERATURE; PHOSPHORUS; TEXTURE; STEELS;
D O I：
10.1016/j.matchar.2025.114816
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study adopts a promising technique named multi-pass hot caliber rolling (MP-HCR) to manufacture the Ti6Al4V bars with a ultra-fine fibrous (UFF) microstructure to improve the comprehensive properties of material. However, this kind of special microstructure is sensitive to temperature and could result in a complex evolution, and even heavily influence the service performance. Thus, an exact understanding of the MP-HCR processing- microstructure- properties relationship is a necessary step for precisely tailoring this UFF microstructure and taking its potential advantage. For this purpose, the Ti6Al4V bars were firstly manufactured by the MP-WCR method, then high-temperature tensile and impact tests were carried out to obtain the strength, plasticity, and toughness indicators at different temperatures, and finally scanning electron microscope (SEM), electron back- scattered diffraction (EBSD) and transmission electron microscope (TEM) were utilized to analyze the UFF evolution. To uncover the formation mechanism of the fibrous structure and very ultra-fine grains, a thermomechanical coupled finite element method, combining with the microstructural characterization, was used to analyze the MP-HCR deformation, and it is concluded that the effects of elongation along the rolling direction and mechanical fragmenting are mainly responsible for the formation of UFF. It is found that the ultra-fine grains coarsening reduces the strength while the interfaced zones between the fibrous structure becomes a potential crack source deteriorating the impact toughness. To obtain a desired combination of microstructure and properties, a proposed processing scheme of rolling temperature at 700 degrees Cwith a reduction of 51 % is selected for MPWCR in this work.
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页数：24
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