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 journalArticle

2 Citations (Scopus)

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

Fingerprint

Stainless Steel
Ferrite
casts
stainless steels
ferrites
Stainless steel
X rays
microstructure
Microstructure
x rays
centrifugal casting
Centrifugal casting
pressurized water reactors
Pressurized water reactors
coolants
austenite
corrosion resistance
Coolants
Austenite
Corrosion resistance

Keywords

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

ASJC Scopus subject areas

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

Cite this

Microstructure and micropore formation in a centrifugally-cast duplex stainless steel via X-ray microtomography. / Zhang, Qingdong; Niverty, Sridhar; Singaravelu, Arun Sundar S.; Williams, Jason J.; Guo, Enyu; Jing, Tao; Chawla, Nikhilesh.

In: Materials Characterization, Vol. 148, 01.02.2019, p. 52-62.

Research output: Contribution to journalArticle

Zhang, Qingdong ; Niverty, Sridhar ; Singaravelu, Arun Sundar S. ; Williams, Jason J. ; Guo, Enyu ; Jing, Tao ; Chawla, Nikhilesh. / Microstructure and micropore formation in a centrifugally-cast duplex stainless steel via X-ray microtomography. In: Materials Characterization. 2019 ; Vol. 148. pp. 52-62.
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