Unravelling dynamic recrystallisation in a microalloyed steel during rapid high temperature deformation using synchrotron X-rays

DOI: 10.1016/j.actamat.2024.120265

Authors: Kai Zhang (University College London; Research Complex at Harwell) , Tim Wigger (University College London; Research Complex at Harwell) , Rosa Pineda (Luleå University of Technology) , Simon A. Hunt (University of Manchester) , Ben Thomas (University of Sheffield) , Thomas Kwok (Imperial College London) , David Dye (Imperial College London) , Gorka Plata (Mondragon Unibertsitatea) , Jokin Lozares (University of Deusto) , Inaki Hurtado (Mondragon Unibertsitatea) , Stefan Michalik (Diamond Light Source) , Michael Preuss (University of Manchester; Monash University) , Peter D. Lee (University College London; Research Complex at Harwell) , Mohammed A. Azeem (University of Leicester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 10

State: Published (Approved)
Published: August 2024
Diamond Proposal Number(s): 23749

Abstract: Microstructure evolution during high-strain rate and high-temperature thermo-mechanical processing of a 44MnSiV6 microalloyed steel is investigated using in situ synchrotron high-energy powder X-ray diffraction. The conditions selected replicate a newly developed near solidus high-strain rate process designed for reducing raw material use during the hot processing of steels. High temperatures (exceeding 1300 °C) and high strain rate  = 9 s-1 processing regimes are explored. The lattice strains and dislocation activity estimated from diffraction observations reveal that the microstructure evolution is primarily driven by dynamic recrystallisation. A steady-state stress regime is observed during deformation, which develops due to intermittent and competing work hardening and recovery processes. The texture evolution during the heating, tension, shear deformation and cooling stages is systematically investigated. The direct observation of phase evolution at high-temperature and high-strain rate deformation enables a comprehensive understanding of new manufacturing processes and provides deep insights for the development of constitutive models for face-centred cubic alloys.

Journal Keywords: Microalloyed steels; Synchrotron diffraction; High-temperature deformation; Microstructure deformation kinetics; Dynamic recrystallisation

Diamond Keywords: Alloys

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 07/08/2024 10:41

Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Metallurgy

Technical Tags:

Diffraction