Computation of Stress and Strain Evolution During Heat Treatment of Work Rolls

[+] Author and Article Information
José Risso, Andres Anca

 CIMEC - INTEC (UNL/Conicet), Güemes 3450, (3000) Santa Fe, Argentina

Alberto Cardona

 CIMEC - INTEC (UNL/Conicet), Güemes 3450, (3000) Santa Fe, Argentinaacardona@intec.unl.edu.ar

Violeta Colpachi

Research & Development, Fundición San Cayetano, L.M. Drago y Melián, 1852 Burzaco, Argentina

J. Appl. Mech 73(6), 1045-1053 (Jan 03, 2006) (9 pages) doi:10.1115/1.2198247 History: Received September 27, 2005; Revised January 03, 2006

We present a numerical simulation of heat treatment of cast metallic alloys by the finite element method, to predict strains and stresses produced during the said process. From a computational point of view, this problem involves a coupled thermal-metallurgical-mechanical analysis modeled as a non-stationary and non-linear process. The calculation of metallurgical properties is coupled directly with thermal analysis. Material properties, which are dependent on temperature and microstructural composition, are rewritten for the purpose of the analysis as functions of temperature and time. Results of thermo-metallurgical analysis are taken as data for the subsequent mechanical analysis. The simulation was successful and proved the causes of failure during heat treatment of a centrifugally cast three-layered Hi-Chrome work roll.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Approximation of temperature-time transformation

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Figure 2

Conductivity versus temperature approximation

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Figure 3

Conductivity versus time/temperature diagram

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Figure 4

Conductivity versus time/temperature diagram—detail in the quenching cooling zone

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Figure 5

(Left) Work roll main dimensions, (right) FEM mesh

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Figure 6

Observed cracks in the barrel of work rolls

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Figure 7

Temperature-time-transformation diagram for Hi-Cr iron (shell)

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Figure 8

Temperature-time-transformation diagram for SG iron (core)

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Figure 9

Comparison between calculated and measured temperatures in barrel midpoint

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Figure 10

Temperature evolution during quenching cooling

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Figure 11

Intermediate state during austenizing heating (point A, 110h)

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Figure 12

End of austenizing heating (point B, 156h)

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Figure 13

Intermediate state during quenching cooling (point C, 166h)

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Figure 14

End of quenching cooling (point D, 332h)

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Figure 15

End of second tempering cooling (point E, 792h)

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Figure 16

Evolution of equivalent plastic strain




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