Microstructure evolution during hot deformation of REX734 austenitic stainless steel

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Abstract

Mechanical properties of a REX734 austenitic stainless steel were examined through compression testing over a wide range of temperatures (1173 to 1373 K (900 to 1100 °C)) and strain rates (0.1 to 40 s-1) that cover deformation conditions encountered in different metalworking processes. The evolution of microstructure was studied using electron microscopy combined with electron backscatter diffraction and energy dispersive spectroscopy. Partially recrystallized microstructures were obtained after compression testing at 1173 K (900 °C), while after deformation at 1273 and 1373 K (1000 and 1100 °C) the material was fully recrystallized almost in all examined cases. The role dynamic and metadynamic restoration processes in the formation of final microstructure was investigated. Σ3 twin boundaries lost their twin character and transformed into general high-angle grain boundaries as a result of deformation, while during recrystallization new Σ3 twin boundaries formed. The evolution of precipitates during compression testing and their role in the recrystallization process was also discussed.
LanguageEnglish
JournalMetallurgical and Materials Transactions A
DOIs
Publication statusAccepted/In press - 5 Nov 2019

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Compression testing
Hot working
austenitic stainless steels
Austenitic stainless steel
microstructure
Microstructure
Electron diffraction
restoration
Electron microscopy
Restoration
strain rate
Strain rate
Precipitates
Energy dispersive spectroscopy
precipitates
electron microscopy
Grain boundaries
grain boundaries
mechanical properties
Mechanical properties

Keywords

  • austenitic stainless steel
  • hot deformation
  • recovery
  • recrystallization
  • electron backscatter diffraction
  • grain boundary character distribution (GBCD)

Cite this

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title = "Microstructure evolution during hot deformation of REX734 austenitic stainless steel",
abstract = "Mechanical properties of a REX734 austenitic stainless steel were examined through compression testing over a wide range of temperatures (1173 to 1373 K (900 to 1100 °C)) and strain rates (0.1 to 40 s-1) that cover deformation conditions encountered in different metalworking processes. The evolution of microstructure was studied using electron microscopy combined with electron backscatter diffraction and energy dispersive spectroscopy. Partially recrystallized microstructures were obtained after compression testing at 1173 K (900 °C), while after deformation at 1273 and 1373 K (1000 and 1100 °C) the material was fully recrystallized almost in all examined cases. The role dynamic and metadynamic restoration processes in the formation of final microstructure was investigated. Σ3 twin boundaries lost their twin character and transformed into general high-angle grain boundaries as a result of deformation, while during recrystallization new Σ3 twin boundaries formed. The evolution of precipitates during compression testing and their role in the recrystallization process was also discussed.",
keywords = "austenitic stainless steel, hot deformation, recovery, recrystallization, electron backscatter diffraction, grain boundary character distribution (GBCD)",
author = "Mykola Kulakov and Jianglin Huang and Michail Ntovas and Shanmukha Moturu",
year = "2019",
month = "11",
day = "5",
doi = "10.1007/s11661-019-05558-6",
language = "English",
journal = "Metallurgical and Materials Transactions A",
issn = "1073-5623",

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T1 - Microstructure evolution during hot deformation of REX734 austenitic stainless steel

AU - Kulakov, Mykola

AU - Huang, Jianglin

AU - Ntovas, Michail

AU - Moturu, Shanmukha

PY - 2019/11/5

Y1 - 2019/11/5

N2 - Mechanical properties of a REX734 austenitic stainless steel were examined through compression testing over a wide range of temperatures (1173 to 1373 K (900 to 1100 °C)) and strain rates (0.1 to 40 s-1) that cover deformation conditions encountered in different metalworking processes. The evolution of microstructure was studied using electron microscopy combined with electron backscatter diffraction and energy dispersive spectroscopy. Partially recrystallized microstructures were obtained after compression testing at 1173 K (900 °C), while after deformation at 1273 and 1373 K (1000 and 1100 °C) the material was fully recrystallized almost in all examined cases. The role dynamic and metadynamic restoration processes in the formation of final microstructure was investigated. Σ3 twin boundaries lost their twin character and transformed into general high-angle grain boundaries as a result of deformation, while during recrystallization new Σ3 twin boundaries formed. The evolution of precipitates during compression testing and their role in the recrystallization process was also discussed.

AB - Mechanical properties of a REX734 austenitic stainless steel were examined through compression testing over a wide range of temperatures (1173 to 1373 K (900 to 1100 °C)) and strain rates (0.1 to 40 s-1) that cover deformation conditions encountered in different metalworking processes. The evolution of microstructure was studied using electron microscopy combined with electron backscatter diffraction and energy dispersive spectroscopy. Partially recrystallized microstructures were obtained after compression testing at 1173 K (900 °C), while after deformation at 1273 and 1373 K (1000 and 1100 °C) the material was fully recrystallized almost in all examined cases. The role dynamic and metadynamic restoration processes in the formation of final microstructure was investigated. Σ3 twin boundaries lost their twin character and transformed into general high-angle grain boundaries as a result of deformation, while during recrystallization new Σ3 twin boundaries formed. The evolution of precipitates during compression testing and their role in the recrystallization process was also discussed.

KW - austenitic stainless steel

KW - hot deformation

KW - recovery

KW - recrystallization

KW - electron backscatter diffraction

KW - grain boundary character distribution (GBCD)

U2 - 10.1007/s11661-019-05558-6

DO - 10.1007/s11661-019-05558-6

M3 - Article

JO - Metallurgical and Materials Transactions A

T2 - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

SN - 1073-5623

ER -