Dynamic impact response and microstructural evolution of inconel 690 superalloy at elevated temperatures

Woei-Shyan Lee, Chen Yang Liu, Tai Nong Sun

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

This study employs a compressive split-Hopkinson bar to investigate the plastic deformation behaviour of Inconel 690 super alloy when subjected to high temperature and high-strain-rate loading conditions. Dynamic impact testing is performed under strain-rates ranging from 2.3×103 to 8.3×103 s-1 at temperatures between 25 and 900 °C. Optical, scanning, and transmission electron microscopy techniques are used to analyze the fracture and microstructure characteristics of the deformed specimens in order to determine the relationship between the alloy's mechanical and microstructural properties. The experimental results indicate that temperature, strain and strain rate influence the material's mechanical properties. At constant temperature, the flow stress, and strain-rate sensitivity both increase with increasing strain rate, but the activation volume and work hardening coefficient decrease. Meanwhile, at a constant strain rate, the flow stress, strain-rate sensitivity and work hardening coefficient decrease with increasing temperature, but the activation volume and temperature sensitivity increase. Shear band formation is followed by fracture characterized by dimpled structures. Microscopy yields evidence of dislocation and twinning. The dislocation and twinning densities increase with increasing strain-rate and flow stress, but decrease with increasing temperature. It is shown that the Zerilli-Armstrong constitutive equation with experimentally determined specific material parameters successfully describes the flow behaviour of the Inconel 690 super alloy under the current test conditions.

Original languageEnglish
Pages (from-to)210-223
Number of pages14
JournalInternational Journal of Impact Engineering
Volume32
Issue number1-4
DOIs
Publication statusPublished - 2005 Dec 1

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Microstructural evolution
Superalloys
Strain rate
Plastic flow
Temperature
Twinning
Dislocations (crystals)
Strain hardening
Chemical activation
Impact testing
Shear bands
Light transmission
Constitutive equations
Plastic deformation
Microscopic examination
Transmission electron microscopy
Scanning
Mechanical properties
Microstructure
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Safety, Risk, Reliability and Quality
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "This study employs a compressive split-Hopkinson bar to investigate the plastic deformation behaviour of Inconel 690 super alloy when subjected to high temperature and high-strain-rate loading conditions. Dynamic impact testing is performed under strain-rates ranging from 2.3×103 to 8.3×103 s-1 at temperatures between 25 and 900 °C. Optical, scanning, and transmission electron microscopy techniques are used to analyze the fracture and microstructure characteristics of the deformed specimens in order to determine the relationship between the alloy's mechanical and microstructural properties. The experimental results indicate that temperature, strain and strain rate influence the material's mechanical properties. At constant temperature, the flow stress, and strain-rate sensitivity both increase with increasing strain rate, but the activation volume and work hardening coefficient decrease. Meanwhile, at a constant strain rate, the flow stress, strain-rate sensitivity and work hardening coefficient decrease with increasing temperature, but the activation volume and temperature sensitivity increase. Shear band formation is followed by fracture characterized by dimpled structures. Microscopy yields evidence of dislocation and twinning. The dislocation and twinning densities increase with increasing strain-rate and flow stress, but decrease with increasing temperature. It is shown that the Zerilli-Armstrong constitutive equation with experimentally determined specific material parameters successfully describes the flow behaviour of the Inconel 690 super alloy under the current test conditions.",
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Dynamic impact response and microstructural evolution of inconel 690 superalloy at elevated temperatures. / Lee, Woei-Shyan; Liu, Chen Yang; Sun, Tai Nong.

In: International Journal of Impact Engineering, Vol. 32, No. 1-4, 01.12.2005, p. 210-223.

Research output: Contribution to journalArticle

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