Temperature Distribution, Phase Transformations and Residual Stresses in Heat Treatment of Grinding Balls

Abstract:

Article Preview

The goal of this work is to model the temperature distribution, phase transformation and residual stresses induced during the heat treatment of 3 and 5 inches diameter grinding balls. In the first step, the radial distribution of temperature inside the balls was calculated and validated experimentally. During the quenching, the model considers factors such as the heating of the water and the formation of a steam layer that surrounds the balls in the beginning of the treatment. In a second step, with the temperature distribution, the CCT curves of the steel and the Koistinen- Marburger equation, the radial distribution of martensite was determined during the heat treatment. Finally, in the third step, the residual stresses field was modeled considering the temperature distribution, the force equilibrium equations and the constitutive thermo-elastic relationships, where the expansion due to the austenite – martensite transformation was included. In the temperature distribution, a good experimental-theoretical agreement was obtained, with differences at the end of the quenching no higher than 0,5 %. Respect to the residual stresses, the model indicates that the maximum tensile values occur at certain depth below the surface of the balls and the experimental evidence of the behavior of the balls in a mill simulator, as well as the measured residual stresses by means of DRX shows an acceptable agreement with the theoretical predictions.

Info:

Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

2234-2239

Citation:

C. Camurri et al., "Temperature Distribution, Phase Transformations and Residual Stresses in Heat Treatment of Grinding Balls", Materials Science Forum, Vols. 539-543, pp. 2234-2239, 2007

Online since:

March 2007

Export:

Price:

$38.00

[1] C. Camurri, C., Carrasco and P. Cañete: Revue de Métallurgie (1997), p.949.

[2] F. Kreith: Principios de Transferencia de Calor (Herreros Hnos. 1973).

[3] P. Incropera and D. Dewit: Fundamentos de Transferencia de calor (Prentice Hall 1999).

[4] A. Mills: Transferencia de Calor (Irwin 1995).

[5] J. Welty: Transferencia de Calor Aplicada a la Ingeniería (Limusa 1979).

[6] S. Farlow: Partial Differential Equations for Scientists and Engineers (Elsevier 1982).

[7] C. Camurri, A. García and P. Cañete: Mater. Sci. Forum (2003) p.3933.

[8] A. Sorin: Modélisation des conditions de refroidissement d'une éprouvette Jominy (Centre d'études des Structures et des Matériaux, France 1997).

[9] A. García: Esfuerzos residuales durante el temple de medios de molienda (Facultad de Ingeniería, Universidad de Concepción 2000).

Fetching data from Crossref.
This may take some time to load.