Transactions of Materials and Heat Treatment

Title：Influence of microstructure on mechanical properties during multi-pass warm rolled Ti-6Al-4V

Authors： Ling Min

Unit： Guizhou Institute of Technology

KeyWords： Ti-6Al-4V alloy warm rolling microstructure mechanical properties texture

ClassificationCode：TG304

year,vol(issue):pagenumber：2015,40(11):127-131

Abstract：

High strength bulk ultrafine-grained titanium alloy Ti-6Al-4V bars with 12 mm diameter and several meters long were successfully produced by multi-pass warm rolling at different temperatures (650, 700 and 750 ℃). The research shows that when the rolling temperature is 650 ℃,Ti-6Al-4V bars is of the best mechanical properties, namely, the yield strength is 1200 MPa, the tensile strength is 1300 MPa, and the elongation is 10%. The alloys microstructure and its evolution process in the forming were observed by optical microscopy, electron back scattered diffraction (EBSD) and X-ray diffraction. The result shows that the ultra fine-grained microstructure and the morphology of α and β phases after the warm rolling play an important role in improving alloys mechanical properties. Further, the cost and time of small diameter bar products can be saved by multi-pass warm rolling, and the efficiency can be improved.

Funds：

贵州理工学院自然科学基金资助项目（XJZK20130807）

凌敏（1981-），女，硕士，副教授

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