Thermodynamics of nitrogen absorption into solid solution in Fe-Cr-Mn ternary alloys

Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

For the purpose of fabricating ultra-high nitrogen austenitic steels (>1mass%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 absorption of nitrogen gas from the material surface and then saturated when the system reached a state of equilibrium. The effect of the steel composition on the equilibrium nitrogen content was formulated taking 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 ultra-high content markedly increased proof stress and tensile stress of the austenitic steels without losing moderate ductility. For example, Fe-24Cr-10Mn-1.43N (mass%) alloy has 830 MPa in 0.2% proof stress, 2.2 GPa in true tensile stress and 75% in total elongation.

Original languageEnglish
Pages (from-to)957-962
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number2
Publication statusPublished - Jul 18 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: Jul 7 2003Jul 11 2003

Fingerprint

Ternary alloys
ternary alloys
Solid solutions
solid solutions
Nitrogen
Thermodynamics
nitrogen
thermodynamics
steels
Austenitic steel
Steel
tensile stress
Tensile stress
Gases
ductility
gases
elongation
Ductility
Elongation
Annealing

All Science Journal Classification (ASJC) codes

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

Cite this

Thermodynamics of nitrogen absorption into solid solution in Fe-Cr-Mn ternary alloys. / Tsuchiyma, Toshihiro; Takaki, Setsuo.

In: Materials Science Forum, Vol. 426-432, No. 2, 18.07.2003, p. 957-962.

Research output: Contribution to journalConference article

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abstract = "For the purpose of fabricating ultra-high nitrogen austenitic steels (>1mass{\%}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 absorption of nitrogen gas from the material surface and then saturated when the system reached a state of equilibrium. The effect of the steel composition on the equilibrium nitrogen content was formulated taking 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 ultra-high content markedly increased proof stress and tensile stress of the austenitic steels without losing moderate ductility. For example, Fe-24Cr-10Mn-1.43N (mass{\%}) alloy has 830 MPa in 0.2{\%} proof stress, 2.2 GPa in true tensile stress and 75{\%} in total elongation.",
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