Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Surface globularization generated by standard PBF-EB Ti-6Al-4V processing achieves an improvement in fatigue performance

Published

Author(s)

Nicholas Derimow, Keenan Hanson, Newell Moser, Orion Kafka, Jake Benzing, Nik Hrabe

Abstract

Standard electron beam powder-bed fusion Ti-6Al-4V powder recovery and hot-isostatic pressing has been found to result in a surface layer microstructure change to globular α/β. Thickness control of this surface layer up to 15 μm was demonstrated by varying powder recovery blasting working distance and duration. This surface globular layer was found to improve high-cycle rotating bending fatigue strength at 10 M cycles by 60 MPa for specimens with smooth surfaces. The same trend was not observed for specimens with as-built surface roughness because globularization did not occur at dominant fatigue crack initiation sites; the roots of deep surface crevices.
Citation
International Journal of Fatigue

Citation

Derimow, N. , Hanson, K. , Moser, N. , Kafka, O. , Benzing, J. and Hrabe, N. (2022), Surface globularization generated by standard PBF-EB Ti-6Al-4V processing achieves an improvement in fatigue performance, International Journal of Fatigue, [online], https://doi.org/10.1016/j.ijfatigue.2022.106810, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933589 (Accessed August 14, 2022)
Created February 26, 2022, Updated July 27, 2022