Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574714 | Materials Science and Engineering: A | 2014 | 8 Pages |
Abstract
The influence of austenite deformation in non-recrystallization region on microstructural development in low-silicon content TRIP-assisted steels was investigated. Laboratory simulation of a typical thermomechanical control processing was carried out in an automated hot-compression testing machine. Specimens subjected to a typical multi-stage isothermal deformation/cooling program were deformed to true strains of 0, â0.15, â0.25 and â0.35 at various temperatures in austenite non-recrystallization region. Mössbauer spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and a novel tint-etching method were used to investigate the microstructure of deformed specimens. The results indicated that the maximum volume fraction (VRA) and carbon content (CRA%) of retained austenite can be obtained by deforming samples to some intermediate strains (ε=â0.15 for VRA and ε=â0.25 for CRA%). However, further straining of samples to ε=â0.35 resulted in a drastic reduction of both parameters due to formation of pearlite. It was found that a decrease in deformation temperature resulted in increasing VRA and CRA%. Moreover, deformation of austenite was associated with morphology changes in retained austenite particles from interlath film-like type in undeformed specimens to blocky and encapsulated types in the deformed specimens.
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Physical Sciences and Engineering
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Authors
Seyed Mohammad Kazem Hosseini, Abbass Zaeri-Hanzaki, Steve Yue,