Abstract
The influence of cooling rate on phase constitution and tensile properties of Ti-2.9Fe-4.9Cr and Ti-4.2Fe-6.9Cr alloys was investigated by electrical resistivity and Vickers hardness measurements, X-ray diffraction, optical microstructure observation and tensile testing.In only Ti-2.9Fe-4.9Cr alloy quenched at an average cooling rate of 25 Ks−1, reflections from isothermal omega phase were identified, whereas only reflections from beta phase were identified by XRD with no reflections of isothermal omega phase present in Ti-2.9Fe-4.9Cr alloy cooled at other cooling rates and Ti-4.2Fe-6.9Cr alloy quenched at all cooling conditions. HV for Ti-2.9Fe-4.9Cr alloy cooled at 25 Ks−1, was about 400 and HV of Ti-4.2Fe-6.9Cr alloy cooled at all cooling conditions, even 25 Ks−1, was around 320. Therefore, quench sensitivity of Ti-4.2Fe-6.9Cr alloy is lower than that of Ti-2.9Fe-4.9Cr alloy.Tensile strength and reduction in area of Ti-2.9Fe-4.9Cr alloy cooled at three different cooling rates except for 25 Ks−1 showed about 1200 MPa and 45%, respectively. About 1050 MPa in σB and 60% in φ were obtained in all quenched Ti-4.2Fe-6.9Cr alloys, respectively. The strength/ductility balances of Ti-4.2Fe-6.9Cr alloy quenched at four different cooling rates are comparable with those of developed beta titanium alloys in solution treated and quenched state.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Japan Institute of Metals and Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
