Investigation to Hole Surface Microstructure Evolution in Drilling of Aerospace Alloys: Ti-5553

Publication Date

1-1-2021

Document Type

Conference Proceeding

Publication Title

Minerals, Metals and Materials Series

Volume

5

DOI

10.1007/978-3-030-65261-6_40

First Page

433

Last Page

443

Abstract

Ti-5553 (Ti-5Al-5Mo-5V-3Cr-0.5Fe) is a newly developed near β titanium (Ti) alloy with excellent fatigue performance and corrosion resistance. Hence, it is of significant importance in several high-performance aerospace applications such as landing gear components and helicopter rotors. The machinability of Ti-5553 is low owing to its high strength at elevated temperature, low thermal conductivity and high chemical reactivity. Although there is a profound knowledge about the machinability of α + β Ti alloys (typically Ti-6Al-4V), there is a lack of understanding regarding the surface microstructure evolution during machining of Ti-5553. This paper presents experimental investigations on the microstructure evaluation in the hole surface produced from drilling of Ti-5553. A series of high-speed drilling tests were conducted to evaluate the influence of cutting conditions on the hole surface microstructure alternation in relation to the cutting temperature. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) technique were used to characterize the hole surface microstructure evolution. The precipitation of new α phase from β matrix in the hole surface was observed in dry drilling; however, this phenomenon was not detected in wet drilling with a coolant supplied.

Funding Sponsor

San José State University

Keywords

Cutting temperature, High-speed drilling, Microstructure evolution, Surface quality, Ti-5553

Department

Aviation and Technology

Link to Full Text

Share

COinS