Multiscale characterization of the 3D network structure of metal carbides in a Ni superalloy by synchrotron X-ray microtomography and ptychography

Research output: Contribution to journalArticlepeer-review

Authors

  • Zhiguo Zhang
  • Jia Chuan Khong
  • Billy Koe
  • Shifeng Luo
  • Shi Huang
  • Ling Qin
  • Silvia Cipiccia
  • Darren Batey
  • Andrew J. Bodey
  • Christoph Rau
  • Zhu Zhang
  • Jiawei Mi

Abstract

Synchrotron X-ray microtomography and ptychography were used to characterize the 3D network structure, morphology and distribution of metal carbides in an as-cast IN713LC Ni superalloy. MC typed carbides were found to distribute mainly on the grain boundary between the matrix γ and γ' phase. The differences in solidification cooling rate had a minor influence on the volume fraction of the MC type carbides, but significantly affected the carbide size, distribution and network morphology. Depending on the local composition of the remaining liquid phase and geometric constraints, the carbides can form either spherical or strip or network morphologies. The research demonstrated clearly the advantage and technical potential of using the two complementary tomography techniques synergistically to characterize non-destructively complex multiple-phase structures in three dimensional space with a spatial resolution of ~30 nm.

Details

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalScripta Materialia
Volume193
Early online date1 Nov 2020
Publication statusE-pub ahead of print - 1 Nov 2020

Keywords

  • IN713LC Ni superalloy, Metal carbides, Ptychography, Synchrotron X-ray microtomography