Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting

A. K. Syed; D. Parfitt; D. Wimpenny; E. Muzangaza; B. Chen

doi:10.1016/j.ijfatigue.2022.106883

Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting

A. K. Syed, D. Parfitt, D. Wimpenny, E. Muzangaza, B. Chen

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Article number	106883
Journal	International Journal of Fatigue
Volume	160
Early online date	31 Mar 2022
DOIs	https://doi.org/10.1016/j.ijfatigue.2022.106883
Publication status	Published - Jul 2022

Bibliographical note

Funding Information:
Bo Chen acknowledges UK's Engineering and Physical Sciences Research Council, EPSRC, for financial support through the First Grant Scheme EP/P025978/1 and Early Career Fellowship Scheme EP/R043973/1. Barry Meek from Coventry University and Stan Hiller from The Open University, UK are acknowledged for their support during the LCF sample manufacturing and testing. The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

Funding Information:
Bo Chen acknowledges UK's Engineering and Physical Sciences Research Council, EPSRC, for financial support through the First Grant Scheme EP/P025978/1 and Early Career Fellowship Scheme EP/R043973/1. Barry Meek from Coventry University and Stan Hiller from The Open University, UK are acknowledged for their support during the LCF sample manufacturing and testing.

Publisher Copyright:
© 2022 The Author(s)

Funder

EPSRC Grants: EP/P025978/1 and EP/R043973/1

Keywords

Additive manufacturing
Cyclic deformation
Electron beam melting
Strain controlled fatigue
Titanium alloys

ASJC Scopus subject areas

Modelling and Simulation
General Materials Science
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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Syed_et_al_Cyclic plasticityFinal published version, 18.6 MBLicence: CC BY

Cite this

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title = "Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting",

abstract = "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.",

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author = "Syed, {A. K.} and D. Parfitt and D. Wimpenny and E. Muzangaza and B. Chen",

note = "Funding Information: Bo Chen acknowledges UK's Engineering and Physical Sciences Research Council, EPSRC, for financial support through the First Grant Scheme EP/P025978/1 and Early Career Fellowship Scheme EP/R043973/1. Barry Meek from Coventry University and Stan Hiller from The Open University, UK are acknowledged for their support during the LCF sample manufacturing and testing. The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. Funding Information: Bo Chen acknowledges UK's Engineering and Physical Sciences Research Council, EPSRC, for financial support through the First Grant Scheme EP/P025978/1 and Early Career Fellowship Scheme EP/R043973/1. Barry Meek from Coventry University and Stan Hiller from The Open University, UK are acknowledged for their support during the LCF sample manufacturing and testing. Publisher Copyright: {\textcopyright} 2022 The Author(s)",

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language = "English",

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AU - Parfitt, D.

AU - Wimpenny, D.

AU - Muzangaza, E.

AU - Chen, B.

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N2 - 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.

AB - 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.

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Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting

Abstract

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Keywords

ASJC Scopus subject areas

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