Surface modification of dilute Mo-Ti alloys by gas carburization

Naoki Nomura, Masahiro Nagae, Jun Takada, Yutaka Hiraoka, Tetsuo Yoshio

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

For pure Mo and dilute Mo-Ti Alloys carburized in mixed gases of argon and carbon monoxide, microstructural observation through a transmission electron microscope, X-ray diffraction analysis and hardness measurements were carried out. Static three-point bend tests were also performed at temperatures from 77 to 298 K. In the case of Mo-Ti alloys, hardening due to the internal carburizing was recognized, whereas no hardening was observed in the case of pure Mo. The hardness of the internal carburizing layer exhibited Hv∼300 for the specimen carburized at 1673 K for 16 h, gradually decreasing as the depth from specimen surface increased. The rate of hardening was strongly dependent on the carbon monoxide concentration. X-ray diffraction analysis for carburized specimens revealed that brittle α -Mo2C layer was hardly formed on the specimen surface in the case of low carbon monoxide concentration. These results suggest that gas carburization using mixed gases of argon and carbon monoxide is effective to the strengthening of Mo-Ti alloys.

Original languageEnglish
Pages (from-to)2449-2452
Number of pages4
JournalMaterials Science Forum
Volume426-432
Issue number3
Publication statusPublished - 2003

Fingerprint

Carbon Monoxide
Carbon monoxide
carbon monoxide
Surface treatment
Gases
hardening
carburizing
Hardening
Carburizing
Argon
gases
X ray diffraction analysis
hardness
Hardness
argon
bend tests
Strengthening (metal)
diffraction
x rays
Electron microscopes

Keywords

  • α-MoC phase
  • Carbon monoxide gas
  • Gas-carburization
  • Hardening
  • Internal carburizing
  • Molybdenum-Titanium Alloys

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nomura, N., Nagae, M., Takada, J., Hiraoka, Y., & Yoshio, T. (2003). Surface modification of dilute Mo-Ti alloys by gas carburization. Materials Science Forum, 426-432(3), 2449-2452.

Surface modification of dilute Mo-Ti alloys by gas carburization. / Nomura, Naoki; Nagae, Masahiro; Takada, Jun; Hiraoka, Yutaka; Yoshio, Tetsuo.

In: Materials Science Forum, Vol. 426-432, No. 3, 2003, p. 2449-2452.

Research output: Contribution to journalArticle

Nomura, N, Nagae, M, Takada, J, Hiraoka, Y & Yoshio, T 2003, 'Surface modification of dilute Mo-Ti alloys by gas carburization', Materials Science Forum, vol. 426-432, no. 3, pp. 2449-2452.
Nomura N, Nagae M, Takada J, Hiraoka Y, Yoshio T. Surface modification of dilute Mo-Ti alloys by gas carburization. Materials Science Forum. 2003;426-432(3):2449-2452.
Nomura, Naoki ; Nagae, Masahiro ; Takada, Jun ; Hiraoka, Yutaka ; Yoshio, Tetsuo. / Surface modification of dilute Mo-Ti alloys by gas carburization. In: Materials Science Forum. 2003 ; Vol. 426-432, No. 3. pp. 2449-2452.
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