Low-temperature toughness of TZM alloy which internally nitrided by N2 gas

Makoto Kobayashi, Yutaka Hiraoka, Masahiro Nagae, Jun Takada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In order to investigate the effect of dispersion of fine nitride particles on the low-temperature toughness of molybdenum, bend tests were performed for TZM alloy which had been internally nitrided by N2 gas and demonstrated surface hardness of 250 Hv and 300 Hv. In this study the low-temperature fracture strength and ductility were represented by critical stress and critical temperature, respectively. The results are summarized as follows. (1) Yield strength of the nitrided specimens was generally much higher than that of the recrystallized ones. (2) Critical stress of the nitrided specimens was approximately as high as that of the recrystallized ones. (3) Fracture mode of the nitrided specimens was almost similar to that of the recrystallized ones. Transgranular fracture was predominant. (4) Ductility of the nitrided specimens was much lower than that of the recrystallized ones. These results are attributed to the distribution of nitride particles. Very fine nitride particles were observed predominantly in the matrix, but not at and near the grain boundaries.

Original languageEnglish
Pages (from-to)705-709
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume46
Issue number7
DOIs
Publication statusPublished - Jul 1999

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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