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In situ Temperature Measurement During Spray Forming of A2-tool Steel and Axisymmetric Two-dimensional Analysis

Published online by Cambridge University Press:  31 January 2011

B. C. Moon ,
Z. H. Lee ,
D. R. White  and
E. J. Lavernia
B. C. Moon
Affiliation:
Department of Materials Science and Engineering, RASOM, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-Ku, Taejon 305-701, Korea
Z. H. Lee
Affiliation:
Department of Materials Science and Engineering, RASOM, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-Ku, Taejon 305-701, Korea
D. R. White
Affiliation:
Materials Systems Reliability Department, Ford Research Laboratory, Dearborn, Michigan 48121-2053
E. J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California—Irvine, Irvine, California 92697
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Abstract

An in situ temperature measurement was performed during spraying of A2-tool steel, and the results were used to verify an axisymmetric two-dimensional computer simulation program, which was developed for the prediction of shape and temperature variation in a spray-forming process. A thin thermocouple was placed inside of the chamber in advance and brought to the surface of the deposit during spraying. The temperature was then recorded. The surface temperature of the deposit was also measured by an infrared video camera. The emissivity of the surface of A2-tool steel during spraying was determined to be 0.23 through comparison of the temperatures measured by the thermocouple with the ones measured by the infrared video camera. The heat transfer coefficient at the top surface was estimated by comparing the calculated results with the experimental data. The cooling curve predicted on the basis of the numerical simulation showed good agreement with the experimental data.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1669 - 1678
Copyright
Copyright © Materials Research Society 2000

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