Microstructure evolution during hot deformation of REX734 austenitic stainless steel

Kulakov, Mykola and Huang, Jianglin and Ntovas, Michail and Moturu, Shanmukha (2020) Microstructure evolution during hot deformation of REX734 austenitic stainless steel. Metallurgical and Materials Transactions A, 51 (2). pp. 845-854. ISSN 1073-5623

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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.

ORCID iDs

Kulakov, Mykola ORCID: https://orcid.org/0000-0001-5605-8824

Ntovas, Michail ORCID: https://orcid.org/0000-0001-7335-318X

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  Item type:	Article
  ID code:	70525
  Dates:	Date Event 29 February 2020 Published 4 December 2019 Published Online 5 November 2019 Accepted
  Keywords:	austenitic stainless steel, hot deformation, recovery, recrystallization, electron backscatter diffraction, grain boundary character distribution (GBCD), Environmental engineering, Mechanical engineering and machinery, Mechanics of Materials, Metals and Alloys, Condensed Matter Physics
  Subjects:	Technology > Engineering (General). Civil engineering (General) > Environmental engineering Technology > Mechanical engineering and machinery
  Department:	Faculty of Engineering > Design, Manufacture and Engineering Management > National Manufacturing Institute Scotland Strategic Research Themes > Advanced Manufacturing and Materials Faculty of Engineering > Design, Manufacture and Engineering Management
  Depositing user:	Pure Administrator
  Date deposited:	14 Nov 2019 15:18
  Last modified:	08 May 2021 00:45
  Related URLs:	Scopus publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/70525