Constructing the Three-Dimensional Morphology of Intragranular Acicular Ferrite to Reveal the Formation Mechanism at the View of Growth Behavior
16 Pages Posted: 20 Dec 2019 First Look: Under Review
Precipitation of intragranular acicular ferrite (IAF) and interlocking microstructure is the chief principal, which can increase the strength and toughness of steel. Herein, the three-dimensional morphology and growth behavior of IAF is discussed. Focused Ion Beam, confocal laser scanning microscopy and electron backscattered diffraction were used. Results show that IAF was plate-like shape with much pits and defects, and needle-like with smooth surface which isolate in 750oC and 700oC for 1min respectively. The growth behavior of IAF and interlocking microstructure were studied. Additionally, we provide a theoretical basis for the three-dimensional morphology forming mechanism in a new perspective of IAF.
Keywords: three-dimensional morphology, ferrite, PE mode, LE mode, growth rate
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