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Journal of Iron and Steel Research International

, Volume 26, Issue 12, pp 1366–1375 | Cite as

Effects of solution treatment and cold rolling on structure and tensile properties of hot-rolled Ti–7.5Mo alloy

  • Yen-chun Chen
  • Chien-ping Ju
  • Jiin-huey Chern LinEmail author
Original Paper
  • 22 Downloads

Abstract

The effects of solution treatment (ST) and cold rolling (CR) on structure and tensile properties of a heavily hot-rolled (HR) Ti–7.5Mo alloy were investigated. Experimental results indicated that, after HR with a one-pass 65% reduction in thickness, the pores in as-received samples substantially disappeared, the misorientation angle distribution became broader, and grain texture shifted toward \(\left\langle {10\bar{1}0} \right\rangle\). Post-HR ST produced an orthorhombic α″-phase with fine needle-type morphology and caused misorientation to narrow down to 55°–65° with substantially random texture; post-ST CR caused misorientation shift toward high-angle side and texture toward \(\left\langle {10\bar{1}0} \right\rangle\) and \(\left\langle {2\bar{1} \bar{1}0} \right\rangle\). With an increase in reduction in thickness, α′(102) intensity increased at the expense of two adjacent (112)/(022) α′′-peaks. All X-ray diffraction, metallography and electron backscattered diffraction on scanning electron microscope results indicated that pre-ST HR did not affect the formation of the desired low-modulus α′′-phase when the alloy was subsequently solution-treated. From a practical point of view, the most optimal tensile properties may be found in the sample solution-treated at 900 °C for 30 min and cold-rolled by a 20% reduction in thickness, which demonstrated a yield strength of 924 MPa, an ultimate tensile strength of 933 MPa, a tensile modulus of 73 GPa, and an elongation of 26%.

Keywords

Titanium alloy Ti–Mo alloy Electron backscattered diffraction Microstructure Mechanical property 

Notes

Acknowledgements

The authors would like to acknowledge the support for this research by National Science Council of Taiwan, China under the Research Grant No. NSC 101-2622-E-006-030-CC2.

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  • Yen-chun Chen
    • 1
  • Chien-ping Ju
    • 1
  • Jiin-huey Chern Lin
    • 1
    Email author
  1. 1.Department of Materials Science and EngineeringCheng-Kung UniversityTaiwan 70101China

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