Dynamic shear properties of alloy 718 over wide temperature range

Woei-Shyan Lee, Chi Feng Lin, Tao Hsing Chen, Chi Sheng Huang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, a split Hopkinson torsional bar was utilised to study the dynamic shear deformation behaviour of Alloy 718 at shear strain rates of 1000, 1500 and 3200 s -1 and temperatures of -150, 25 and 300°C. It was found that the mechanical behaviour of Alloy 718 is sensitive to both the strain rate and the temperature. The yield shear stress and work hardening coefficient increased with increasing strain rate, but decreased with increasing temperature. In addition, the fracture shear strain increased with increasing strain rate and temperature. The strain rate sensitivity and temperature sensitivity increased with increasing strain and strain rate, but decreased with increasing temperature. It was found that the high strain rate plastic deformation of Alloy 718 alloy can be adequately described using the Kobayashi and Dodd constitutive equation. Finally, the fracture surfaces were found to contain multiple dimple-like features. The dimple density increased with increasing strain rate and temperature. Thus, it was inferred that the ductility of Alloy 718 increases at higher strain rates and temperatures.

Original languageEnglish
Pages (from-to)1758-1764
Number of pages7
JournalMaterials Transactions
Volume53
Issue number10
DOIs
Publication statusPublished - 2012 Oct 5

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shear properties
strain rate
Strain rate
Temperature
temperature
shear strain
Shear strain
work hardening
constitutive equations
Constitutive equations
ductility
Strain hardening
hardening
Shear deformation
shear stress
plastic deformation
Ductility
Shear stress
Plastic deformation
shear

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Lee, Woei-Shyan ; Lin, Chi Feng ; Chen, Tao Hsing ; Huang, Chi Sheng. / Dynamic shear properties of alloy 718 over wide temperature range. In: Materials Transactions. 2012 ; Vol. 53, No. 10. pp. 1758-1764.
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Dynamic shear properties of alloy 718 over wide temperature range. / Lee, Woei-Shyan; Lin, Chi Feng; Chen, Tao Hsing; Huang, Chi Sheng.

In: Materials Transactions, Vol. 53, No. 10, 05.10.2012, p. 1758-1764.

Research output: Contribution to journalArticle

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AU - Lee, Woei-Shyan

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AB - In this study, a split Hopkinson torsional bar was utilised to study the dynamic shear deformation behaviour of Alloy 718 at shear strain rates of 1000, 1500 and 3200 s -1 and temperatures of -150, 25 and 300°C. It was found that the mechanical behaviour of Alloy 718 is sensitive to both the strain rate and the temperature. The yield shear stress and work hardening coefficient increased with increasing strain rate, but decreased with increasing temperature. In addition, the fracture shear strain increased with increasing strain rate and temperature. The strain rate sensitivity and temperature sensitivity increased with increasing strain and strain rate, but decreased with increasing temperature. It was found that the high strain rate plastic deformation of Alloy 718 alloy can be adequately described using the Kobayashi and Dodd constitutive equation. Finally, the fracture surfaces were found to contain multiple dimple-like features. The dimple density increased with increasing strain rate and temperature. Thus, it was inferred that the ductility of Alloy 718 increases at higher strain rates and temperatures.

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