Dilute carbon monoxide gas heating of molybdenum alloys

Masahiro Nagae, Naoko Ise, Jun Takada, Yutaka Hiraoka, Tomohiro Takida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dilute Mo-Zr Alloys heated in mixed gases of argon and carbon monoxide, microstructural observations through a transmission and scanning electron microscope, X-ray diffraction analysis and hardness measurements were carried out. Static three-point bend tests were also performed at 77 K. X-ray diffraction analysis revealed that brittle a-Mo2C layer was hardly formed on the specimen surface at temperatures above 1573 K. Precipitation hardening due to dispersion of columnar Zr02 with a cubic structure was recognized in case of the specimens heated at temperatures above 1673 K. After dilute carbon monoxide gas heating, grain boundary was strengthened due to the grain boundary segregation of carbon, resulting in an increase in fracture strength. These results indicate that dilute carbon monoxide gas heating is effective in the strengthening of molybdenum alloys.

Original languageEnglish
Title of host publicationProceedings of the 17th IFHTSE Congress
PublisherThe Japan Society for Heat Treatment (JSHT)
Pages667-670
Number of pages4
ISBN (Electronic)9780000000002
Publication statusPublished - Jan 1 2008
Event17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
Duration: Oct 26 2008Oct 28 2008

Publication series

NameProceedings of the 17th IFHTSE Congress
Volume2

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
CountryJapan
CityKobe
Period10/26/0810/28/08

Keywords

  • Dilute carbon monoxide healing
  • Grain boundaty strengthening
  • Molybdenum alloy
  • Precipitation hardening

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

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