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Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting.
- Source :
-
International Journal of Fatigue . Jul2022, Vol. 160, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • As-built samples have shown increased α-lath width along the build direction. • HIPing helped to remove the graded microstructure and increased α-lath width by 50%. • Graded microstructure in as-built samples led to graded cyclic softening behaviour. • As built samples from the bottom showed 38% lower plastic strain range than the top. • Application of HIPing reduced the graded cyclic deformation behaviour. Cyclic deformation and damage mechanisms in electron-beam-melted Ti-6Al-4V are investigated. As-built samples exhibit a graded microstructure over the height of 120 mm, with samples from the top having larger α-laths and higher plastic strain. After HIPing, the α-lath width is greater, with reduced grain misorientation, and lower microstructural and property gradients. In both conditions, the observed cyclic softening is dominated by a monotonic reduction in the friction stress and an increase in grain misorientation, suggesting the lath structure progressively fragments into smaller grains. As-built samples show typically lower fatigue life due to crack initiation from gas pores and lack-of-fusion defects. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRON beam furnaces
*ELECTRON beams
*FATIGUE life
*MICROSTRUCTURE
Subjects
Details
- Language :
- English
- ISSN :
- 01421123
- Volume :
- 160
- Database :
- Academic Search Index
- Journal :
- International Journal of Fatigue
- Publication Type :
- Academic Journal
- Accession number :
- 156320436
- Full Text :
- https://doi.org/10.1016/j.ijfatigue.2022.106883