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Instruments / Technical Area	Publication Details	Published	Actions
E02-JEM ARM 300CF	The mechanism of twin thickening and the elastic strain state of TWIP steel nanotwins Thomas W. J. Kwok , T. P. Mcauliffe , A. K. Ackerman , B. H. Savitzky , M. Danaie , C. Ophus , D. Dye Materials Science And Engineering: A 324 DOI: 10.1016/j.msea.2023.145005 Diamond Proposal Number(s): [18770] Open Access Show Abstract ▼ Abstract: A Twinning Induced Plasticity (TWIP) steel with a nominal composition of Fe-16.4Mn-0.9C-0.5Si-0.05Nb-0.05V was deformed to an engineering strain of 6%. The strain around the deformation twins were mapped using the 4D-STEM technique. Strain mapping showed a large average elastic strain of approximately 6% in the directions parallel and perpendicular to the twinning direction. However, the large average strain comprised of several hot spots of even larger strains of up to 12%. These hot spots could be attributed to a high density of sessile Frank dislocations on the twin boundary and correspond to shear stresses of 1–1.5 GPa. The strain and therefore stress fields are significantly larger than other materials known to twin and are speculated to be responsible for the early thickness saturation of TWIP steel nanotwins. The ability to keep twins extremely thin helps improve grain fragmentation, i.e. the dynamic Hall-Petch effect, and underpins the large elongations and strain hardening rates in TWIP steels.	Apr 2023
I12-JEEP: Joint Engineering, Environmental and Processing	Unravelling dynamic recrystallisation in a microalloyed steel during rapid high temperature deformation using synchrotron X-rays Kai Zhang , Tim Wigger , Rosa Pineda , Simon A. Hunt , Ben Thomas , Thomas Kwok , David Dye , Gorka Plata , Jokin Lozares , Inaki Hurtado , Stefan Michalik , Michael Preuss , Peter D. Lee , Mohammed A. Azeem Acta Materialia 10 DOI: 10.1016/j.actamat.2024.120265 Diamond Proposal Number(s): [23749] Show Abstract ▼ 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.	Aug 2024

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