Formation and stabilization of reverted austenite in supermartensitic stainless steel

Frank Nießen*, Flemming Bjerg Grumsen, John Hald, Marcel Adrianius Johannes Somers

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The formation and stabilization of reverted austenite upon inter-critical annealing was investigated in a X4CrNiMo16-5-1 (EN 1.4418) supermartensitic stainless steel by means of scanning electron microscopy, electron backscatter-diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and dilatometry. The results were supported by thermodynamics and kinetics models, and hardness measurements. Isothermal annealing for 2 h in the temperature range of 475 to 650 °C led to gradual softening of the material which was related to tempering of martensite and the steady increase of the reverted austenite phase fraction. Annealing at higher temperatures led to a gradual increase in hardness which was caused by formation of fresh martensite from reverted austenite. It was demonstrated that stabilization of reverted austenite is primarily based on chemical stabilization by partitioning, consistent with modeling results.
Original languageEnglish
Article number402
JournalMetallurgical Research and Technology
Volume115
Issue number4
Number of pages9
ISSN2271-3654
DOIs
Publication statusPublished - 2018

Keywords

  • Supermartensitic stainless steel
  • Reversed austenite
  • Annealing treatment
  • Microstructure characterization
  • Kinetics modeling
  • Thermal stability

Cite this

@article{ef237b07af5f4ccfac7ab5a40bc0c58c,
title = "Formation and stabilization of reverted austenite in supermartensitic stainless steel",
abstract = "The formation and stabilization of reverted austenite upon inter-critical annealing was investigated in a X4CrNiMo16-5-1 (EN 1.4418) supermartensitic stainless steel by means of scanning electron microscopy, electron backscatter-diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and dilatometry. The results were supported by thermodynamics and kinetics models, and hardness measurements. Isothermal annealing for 2 h in the temperature range of 475 to 650 °C led to gradual softening of the material which was related to tempering of martensite and the steady increase of the reverted austenite phase fraction. Annealing at higher temperatures led to a gradual increase in hardness which was caused by formation of fresh martensite from reverted austenite. It was demonstrated that stabilization of reverted austenite is primarily based on chemical stabilization by partitioning, consistent with modeling results.",
keywords = "Supermartensitic stainless steel, Reversed austenite, Annealing treatment, Microstructure characterization, Kinetics modeling, Thermal stability",
author = "Frank Nie{\ss}en and Grumsen, {Flemming Bjerg} and John Hald and Somers, {Marcel Adrianius Johannes}",
year = "2018",
doi = "10.1051/metal/2018051",
language = "English",
volume = "115",
journal = "Metallurgical Research and Technology",
issn = "2271-3654",
publisher = "EDP Sciences",
number = "4",

}

Formation and stabilization of reverted austenite in supermartensitic stainless steel. / Nießen, Frank; Grumsen, Flemming Bjerg; Hald, John; Somers, Marcel Adrianius Johannes.

In: Metallurgical Research and Technology, Vol. 115, No. 4, 402, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Formation and stabilization of reverted austenite in supermartensitic stainless steel

AU - Nießen, Frank

AU - Grumsen, Flemming Bjerg

AU - Hald, John

AU - Somers, Marcel Adrianius Johannes

PY - 2018

Y1 - 2018

N2 - The formation and stabilization of reverted austenite upon inter-critical annealing was investigated in a X4CrNiMo16-5-1 (EN 1.4418) supermartensitic stainless steel by means of scanning electron microscopy, electron backscatter-diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and dilatometry. The results were supported by thermodynamics and kinetics models, and hardness measurements. Isothermal annealing for 2 h in the temperature range of 475 to 650 °C led to gradual softening of the material which was related to tempering of martensite and the steady increase of the reverted austenite phase fraction. Annealing at higher temperatures led to a gradual increase in hardness which was caused by formation of fresh martensite from reverted austenite. It was demonstrated that stabilization of reverted austenite is primarily based on chemical stabilization by partitioning, consistent with modeling results.

AB - The formation and stabilization of reverted austenite upon inter-critical annealing was investigated in a X4CrNiMo16-5-1 (EN 1.4418) supermartensitic stainless steel by means of scanning electron microscopy, electron backscatter-diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and dilatometry. The results were supported by thermodynamics and kinetics models, and hardness measurements. Isothermal annealing for 2 h in the temperature range of 475 to 650 °C led to gradual softening of the material which was related to tempering of martensite and the steady increase of the reverted austenite phase fraction. Annealing at higher temperatures led to a gradual increase in hardness which was caused by formation of fresh martensite from reverted austenite. It was demonstrated that stabilization of reverted austenite is primarily based on chemical stabilization by partitioning, consistent with modeling results.

KW - Supermartensitic stainless steel

KW - Reversed austenite

KW - Annealing treatment

KW - Microstructure characterization

KW - Kinetics modeling

KW - Thermal stability

U2 - 10.1051/metal/2018051

DO - 10.1051/metal/2018051

M3 - Journal article

VL - 115

JO - Metallurgical Research and Technology

JF - Metallurgical Research and Technology

SN - 2271-3654

IS - 4

M1 - 402

ER -