Hot deformation behavior of an industrially cast large grained low density austenitic steel

D. T. Pierce, D. M. Field, K. R. Limmer, T. Muth, K. M. Sebeck

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Hot compression testing was performed on specimens of an Fe–30Mn–9Al–1Si-0.9C-0.5Mo wt.% low density steel which were extracted from an industrial casting with large grain size (320 ± 50 μm). Grain boundaries act as nucleation sites for dynamic recrystallization in the present material and the large grain size results in fewer nucleation sites, which delays dynamic recrystallization to larger strains and/or higher temperatures and causes higher rates of work hardening relative to similar materials but with smaller grain sizes. A relatively high activation energy for hot deformation of 470 ± 90 kJ mol−1 was determined from a Zener-Hollomon analysis of the flow stresses at different temperatures and strain rates, attributed in part to the large grain size.

Original languageEnglish
Article number141785
JournalMaterials Science and Engineering: A
Volume825
DOIs
StatePublished - Sep 21 2021

Funding

The information, data, or work presented herein was conducted as an Advanced Vehicle Power Technology Alliance (AVPTA) “Extended Enterprise” project funded by the US Army Futures Command DEVCOM Ground Vehicle Systems Center (GVSC) , U.S. Department of Defense (DoD) , Department of the Army. AVPTA is Chartered under the auspices of the Department of Energy/DoD Memorandum of Understanding titled “Concerning Cooperation in a Strategic Partnership to Enhance Energy Security”. Additional support was funded through the Combat Vehicle Weight Reduction Initiative. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Government. The information, data, or work presented herein was conducted as an Advanced Vehicle Power Technology Alliance (AVPTA) ?Extended Enterprise? project funded by the US Army Futures Command DEVCOM Ground Vehicle Systems Center (GVSC), U.S. Department of Defense (DoD), Department of the Army. AVPTA is Chartered under the auspices of the Department of Energy/DoD Memorandum of Understanding titled ?Concerning Cooperation in a Strategic Partnership to Enhance Energy Security?. Additional support was funded through the Combat Vehicle Weight Reduction Initiative. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Government. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

  • Activation energy
  • Hot deformation
  • Low density steel
  • Rolling
  • Zener-holloman analysis

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