The carburization behavior of alloy 800HT in high temperature supercritical-CO2

Gokul Obulan Subramanian, Sung Hwan Kim, Changheui Jang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The contribution of high temperature supercritical-CO2 (S-CO2) exposure (650 °C for 1000 h) on the carburization behavior of Alloy 800HT was studied. For comparison, Alloy 800HT specimens were also exposed to air and vacuum environments. The S-CO2 exposed specimens showed carbon-accumulated layer at the oxide-matrix interface. All specimens showed subsurface carbide precipitation but it was more pronounced for the S-CO2 exposed specimen, suggesting inward carbon diffusion from the carbon-accumulated layer at oxide-matrix interface. The pronounced subsurface carbide precipitation for the S-CO2 exposed specimens resulted in much increased hardening and reduction in ductility. Thus, we clearly identified that S-CO2 exposure caused the formation of the interfacial carbon-accumulated layer and more subsurface carbide precipitates, and resulting in additional hardening and reduction in ductility for Alloy 800HT.

Original languageEnglish
Article number130067
JournalMaterials Letters
Volume299
Early online date19 May 2021
DOIs
Publication statusPublished - 15 Sep 2021

Bibliographical note

Funding Information:
This study was mainly supported by the Nuclear R&D Program (no. 2020M2A8A402393722 and 2020M2A8A402545322 ) of the MSIT/NRF of the Rep. of Korea.

Keywords

  • Alloy 800HT
  • Carburization
  • High temperature corrosion
  • Oxide spallation
  • Supercritical carbon dioxide
  • Tensile test

ASJC Scopus subject areas

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

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