Thermal Loading of Duplex Steels

[+] Author and Article Information
Vadim V. Silberschmidt

Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leics. LE11 3TU, UK

Ewald A. Werner, Christof Messner

Lehrstuhl für Mechanik und Christian-Doppler-Laboratorium für Moderne Mehrphasenstähle, TU München, Boltzmannstr. 15, D-85747 Garching, Germany

J. Eng. Mater. Technol 125(1), 56-64 (Dec 31, 2002) (9 pages) doi:10.1115/1.1525250 History: Received January 22, 2001; Revised March 12, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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Change of surface topography due to cyclic thermal loading. Initially polished surface (a) and surfaces perpendicular (b) and parallel (c) to the axis of forging after 5 cycles at 1°C/s.
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Finite-element discretisation of one octant of cylindrical specimen for a standard three-dimensional-model (characteristic length scale 210 μm; 15600 elements). Ferrite is shown black.
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Finite-element discretisation of one octant of cylindrical specimen with longitudinal phase domains (characteristic length scale 210 μm; 15510 elements)
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Finite-element discretisation of inclusions in one quarter of square and circular transversal cross-sections (characteristic length scale 40 μm; 20000 and 15759 finite elements, respectively)
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Evolution of the equivalent plastic strain at heating from 20°C in different points of ferritic inclusions and of the austenitic matrix (FE-simulations with the characteristic length scale 40 μm)
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Typical distribution of equivalent plastic strain (in percent) in ferritic inclusions after 5 thermal cycles (1/500th part of the quarter of the specimen’s cross-section shown in Fig. 10 is presented)
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FE-prediction for roughness evolution on the specimen’s surface at thermal cycling (austenitic matrix)
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Evolution of residual axial strains at thermal cycling in XA and ZA specimens
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Mean residual axial strain increments in XA and ZA specimens at thermal cycling
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Instantaneous levels of Young’s moduli and of coefficients of thermal expansion for ferrite (α) and austenite (γ)
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Temperature dependence of yield stresses of ferrite and austenite
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Metallographic sections of duplex steel Z: (a) perpendicular and (b) parallel to the axis of the forged rod. Ferrite is the dark phase.
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Change of the axial length of XA specimen during 5 thermal cycles. Heating/cooling rate 5°C/s.



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