In Situ EBSD Observation of Pearlite-Austenite Reverse Transformation in Eutectoid Steel

Anh Hoang Pham; Shigekazu Morito; Takuya Ohba; Taisuke Hayashi

doi:10.4028/www.scientific.net/MSF.985.42

Paper Titles

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Micromechanical Analysis of Dislocation and Precipitate Interactions in Aluminum Alloys
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Robustness in Coupling between Iron and Rare Earth Spins in Rare Earth Orthoferrites
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Dislocation Dynamics Simulations of Dislocation-Particle Bypass Mechanisms
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In Situ EBSD Observation of Pearlite-Austenite Reverse Transformation in Eutectoid Steel
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First-Principles Study of the Adsorption of Carboxylic Acid on Cu(111)
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Corrosion Resistance of the Sintered Fe-Cu-C, Fe-Cu-Ni-Mo-C and Fe-Cr-Mo-C Alloys Coated with a Rust Preventive Oil
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Nanotube Formation on Ti-15Zr-4Nb-4Ta by Anodic Oxidation
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In Situ EBSD Observation of Pearlite-Austenite Reverse Transformation in Eutectoid Steel

Abstract:

The reverse transformation of austenite from pearlite was observed in-situ by using a sophisticated EBSD system. Quantitative information on the nucleation sites and orientation selection of the austenite was obtained. Initially, the nucleation sites were restricted to high-angle grain boundary (HAB) and all the austenite orientations were selected by Kurdjumov-Sachs (K-S) orientation relationship. Latterly, the constraints were relaxed as new nucleation sites were involved. The γ growth was preferentially into the pearlite grains without K-S relation. Nucleation and growth at HAB edge may contribute to γ coarse grains, whereas nucleation at pre-existing γ boundary is important to grain refinement of γ structure.