Fabrication of ultrahigh nitrogen austenitic steels by nitrogen gas absorption into solid solution

Toshihiro Tsuchiyma, H. Ito, K. Kataoka, Setsuo Takaki

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

For the purpose of fabricating ultrahigh nitrogen austenitic steels (> 1 mass pet N), the phenomenon of nitrogen absorption into solid solution was thermodynamically analyzed and applied to Fe-Cr-Mn system ternary alloy. During the annealing of the steel in a nitrogen gas atmosphere of 0.1 MPa at 1473 K (nitrogen absorption treatment), the nitrogen content of the steel was increased with the absorp- tion of nitrogen gas from the material surface and then saturated when the system reached a state of equilibrium. Effect of the steel composition on an equilibrium nitrogen content was formulated tak- ing account of interactions among Cr, Mn, and N atoms, and the condition for fabrication of ultra- high nitrogen austenitic steels was clarified. The nitrogen addition to ultrahigh content markedly increased proof stress and tensile stress of the austenitic steels without losing moderate ductility. For example, Fe-24Cr-10Mn-1.43N (mass pet) alloy has 830 MPa in 0.2 pet proof stress, 2.2 GPa in true vtensile stress, and 75 pet in total elongation. As a result of tensile tests for various nitrogen-bearing austenitic steels, it was found that the proof stress is increased in proportion to (atomic fraction of nitrogen).

Original languageEnglish
Pages (from-to)2591-2599
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume34 A
Issue number11
DOIs
Publication statusPublished - Jan 1 2003

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Gas absorption
Austenitic steel
Solid solutions
solid solutions
Nitrogen
steels
nitrogen
Fabrication
fabrication
gases
Steel
austenitic steel
Bearings (structural)
Gases
Ternary alloys
ternary alloys
tensile tests
ductility
tensile stress
Tensile stress

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Fabrication of ultrahigh nitrogen austenitic steels by nitrogen gas absorption into solid solution. / Tsuchiyma, Toshihiro; Ito, H.; Kataoka, K.; Takaki, Setsuo.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 34 A, No. 11, 01.01.2003, p. 2591-2599.

Research output: Contribution to journalArticle

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