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Título del libro: Quenching Control And Distortion - Proceedings Of The 6th International Quenching And Control Of Distortion Conference, Including The 4th International Distortion Engineering Conference
Título del capítulo: A new methodology for estimating heat transfer boundary conditions during quenching of steel probes

Autores UNAM:
JOSE BERNARDO HERNANDEZ MORALES;

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Autores externos:

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Idioma:

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Año de publicación:
2012

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Palabras clave:

Analysis; Cooling curve; IHCP; Mathematical model; Transformation

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Resumen:

Cooling curve analysis is a powerful method to characterize the cooling power of quench baths. From the cooling curve the local cooling rate and the heat transfer boundary condition may be estimated. However, the fact that the rate of phase transformation and the rate of heat extraction are interrelated has prompted the use of probes fabricated with materials that do not transform upon quenching. Unfortunately, the thermophysical properties of such materials are not the same as those of heat treatable steels which hinders the use of the estimated boundary conditions for modeling purposes. Thus, the possibility of building a composite surface heat flux curve was explored by conducting a series of experiments with instrumented AISI 4140 steel probes quenched from temperatures below the austenitizing temperature in a fludized bed (alumina-air at room temperature); probes were also quenched from the recommended austenitizing temperature. Using the measured thermal responses the surface heat flux, as a function of surface temperature, was estimated for all experiments, generating a family of curves. Since heat extraction depends primarily on the instantaneous driving force, in the region of the austenite-martensite transformation all curves have very similar values. Therefore, it should possible to build a composite curve that may be effectively used in mathematical models of quenching processes in a fludized bed. The hypothesis was probed by developing a mathematical model which was validated against measured cooling curves; the comparison showed that the proposal is valid. This methodology should be further explored to assess its applicability to quenching in vaporizable media. Copyright © 2012 ASM International® All rights reserved.

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Entidades citadas de la UNAM:

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ISBN:
1615039805
Editorial:

Tipo de producto:
Conference Paper