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

Woei Shyan Lee, Chen Yang Liu, Tai Nong Sun

研究成果: Article同行評審

62 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)210-223
頁數14
期刊International Journal of Impact Engineering
32
發行號1-4
DOIs
出版狀態Published - 2005 12月

All Science Journal Classification (ASJC) codes

  • 土木與結構工程
  • 汽車工程
  • 航空工程
  • 安全、風險、可靠性和品質
  • 海洋工程
  • 材料力學
  • 機械工業

指紋

深入研究「Dynamic impact response and microstructural evolution of inconel 690 superalloy at elevated temperatures」主題。共同形成了獨特的指紋。

引用此