Microstructure and micropore formation in a centrifugally-cast duplex stainless steel via X-ray microtomography

Qingdong Zhang, Sridhar Niverty, Arun Sundar S. Singaravelu, Jason J. Williams, Enyu Guo, Tao Jing, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Cast duplex stainless steels (CDSS) is being extensively used in many industries. The morphology and distribution of ferrite phase present, as well as the micropores defect, significantly influences the hot cracking susceptibility and corrosion resistance of CDSS. In this work, the microstructure and the micropores of the inner wall and outer wall position of a primary coolant pipe used in the pressurized water reactor (PWR) were characterized and compared using a lab scale X-ray microtomography approach. During centrifugal casting process, the local ferrite grains tend to grow in the same direction. Although the ferrite phases seem separated from each other in a two-dimensional (2D) image, most of them are connected in a three-dimensional (3D) view. Solution treatment can result in homogeneous distribution in both fraction and morphology of ferrite phase. Micropores always form along the ferrite/austenite interface and the inner wall position is more prone to porosity.

Original languageEnglish (US)
Pages (from-to)52-62
Number of pages11
JournalMaterials Characterization
Volume148
DOIs
StatePublished - Feb 1 2019

Keywords

  • 3D microstructure
  • Cast duplex stainless steel
  • Micropore
  • Tomography

ASJC Scopus subject areas

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

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