Effect of Austenite Deformation on the Microstructure Evolution and Grain Refinement Under Accelerated Cooling Conditions View Full Text


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Article Info

DATE

2017-05-01

AUTHORS

H. Zhao, E. J. Palmiere

ABSTRACT

Although there has been much research regarding the effect of austenite deformation on accelerated cooled microstructures in microalloyed steels, there is still a lack of accurate data on boundary densities and effective grain sizes. Previous results observed from optical micrographs are not accurate enough, because, for displacive transformation products, a substantial part of the boundaries have disorientation angles below 15 deg. Therefore, in this research, a niobium microalloyed steel was used and electron backscattering diffraction mappings were performed on all of the transformed microstructures to obtain accurate results on boundary densities and grain refinement. It was found that with strain rising from 0 to 0.5, a transition from bainitic ferrite to acicular ferrite occurs and the effective grain size reduces from 5.7 to 3.1 μm. When further increasing strain from 0.5 to 0.7, dynamic recrystallization was triggered and postdynamic softening occurred during the accelerated cooling, leading to an inhomogeneous and coarse transformed microstructure. In the entire strain range, the density changes of boundaries with different disorientation angles are distinct, due to different boundary formation mechanisms. Finally, the controversial influence of austenite deformation on effective grain size of low-temperature transformation products was argued to be related to the differences in transformation conditions and final microstructures. More... »

PAGES

3389-3399

References to SciGraph publications

  • 2014-10-08. The Effect of Simulated Thermomechanical Processing on the Transformation Behavior and Microstructure of a Low-Carbon Mo-Nb Linepipe Steel in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2011-02-12. Effect of Composition and Deformation on Coarse-Grained Austenite Transformation in Nb-Mo Microalloyed Steels in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2006-04. Relationship between yield ratio and the material constants of the Swift equation in METALS AND MATERIALS INTERNATIONAL
  • 1994-02. Softening and microstructural change following the dynamic recrystallization of austenite in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1996-04. The influence of niobium supersaturation in austenite on the static recrystallization behavior of low carbon microalloyed steels in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2010-03-17. Bainite Transformation in Deformed Austenite in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2007-07-10. Effects of Molybdenum and Vanadium Addition on Tensile and Charpy Impact Properties of API X70 Linepipe Steels in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1995-05. Transformation strengthening by thermomechanical treatments in C-Mn-Ni-Nb steels in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1987-08. The intermediate transformation of Mn-Mo-Nb steel during continuous cooling in JOURNAL OF MATERIALS SCIENCE
  • 2014-01-18. Effect of the Grain Size and Deformation Substructure of Austenite on the Crystal Geometry of Bainite and Martensite in Low-Carbon Steels in METAL SCIENCE AND HEAT TREATMENT
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s11661-017-3987-z

    DOI

    http://dx.doi.org/10.1007/s11661-017-3987-z

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