Restitution of Prior-Austenite Grain Orientation by Microtexture Analysis of Tempered Martensite Structure in 9Cr-1Mo Ferritic Steel

Manmath Kumar Dash; T. Karthikeyan; S. Saroja; M. Vijayalakshmi

doi:10.4028/www.scientific.net/MSF.702-703.880

Paper Titles

Determination of the Orientation Relation from Variants Inherited by Phase Transformation
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Determination of Crystallographic Elements (Dislocation and Surface Plane) from Automated TEM Orientation Determination
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Evolution of Hot Rolling and Phase Transformation Textures in an α″ (Orthorhombic) Phase in Ti-Nb Alloys
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Evolution of Texture during Directional Solidification of Giant Magnetostrictive Tb_0.3Dy_0.7Fe_1.95 Alloy
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Restitution of Prior-Austenite Grain Orientation by Microtexture Analysis of Tempered Martensite Structure in 9Cr-1Mo Ferritic Steel
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Textural Evolution Evaluated by EBSD and XRD after Thermal Treatment in Ni-Ti Shape Memory Alloy
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Microstructural Irreversibilities under Thermal Cycling in Ni-Ti-Fe Shape Memory Alloys
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Evolution of Texture and Microstructure during Cold Rolling and Annealing of Fe-14Mn-6Si-9Cr-5Ni Shape Memory Alloy
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Deformation Induced Phase Seperation of Ni₄₅Co₅ Mn_36.7In_13.3 Alloy at High Temperature
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Restitution of Prior-Austenite Grain Orientation by Microtexture Analysis of Tempered Martensite Structure in 9Cr-1Mo Ferritic Steel

Abstract:

The 9Cr-1Mo-0.1C steel was solutionzed (1323 K for 1hr) and step cooled (at 40 K/hr between Ms and Mf) to effect martensitic transformation at slower rates, and then subsequently tempered (1023 K for 2 hr). The microtexture of the tempered martensite structure was evaluated using SEM-Electron Back Scattered Diffraction (EBSD) technique, and the crystal orientation data of ferrite crystallites formed within a single prior-γ grain were analyzed in detail. The Kurdjumov-Sachs (K S) orientation relationship (111)γ // (011)α´ [-101]γ // [-1-11]α´ is commonly obeyed in low carbon steels, and a restitution methodology was used to back calculate the orientation of parent γ grain assuming the K-S relationship. The austenite was identified as the common solution of the data set, and its mean orientation has been calculated. The mean deviation from the K-S was calculated to be 3.75º.