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Residual stresses in spray-formed A2 tool steel

Published online by Cambridge University Press:  31 January 2011

H. M. Hu ,
E. J. Lavernia ,
Z. H. Lee  and
D. R. White
H. M. Hu
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697
E. J. Lavernia
Affiliation:
Department of Chemical and Biochemical Engineering and Materials Science, University of California at Irvine, Irvine, California 92697
Z. H. Lee
Affiliation:
Department of Materials Science and Engineering, ROSAM, KAIST, Taejon, 305–701, Korea
D. R. White
Affiliation:
Materials Systems Reliability Department, Ford Research Laboratory, Dearborn, Michigan 48121
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Abstract

The objective of this work was to investigate the fundamental factors that govern the formation and magnitude of residual stresses in A2 tool steel fabricated using spray-forming techniques. To that effect, a finite-element method (FEM) was performed by using a commercial code, ABAQUS, to solve for the temperature and displacement fields. Moreover, the residual stresses in the spray-formed materials were measured using x-ray diffraction to compare the FEM results with experimentation. Two types of substrate material, copper and Rescor™ 780 cer-cast ceramic, were used to investigate the influence of heat conduction on residual stress in the preforms. Relatively good agreement was found between experimentation and theory. The results show that the residual stress varies greatly with the position in deposited preform and that heat-transfer coefficient at the interface of spray-formed material/substrate affects the distribution and magnitude of the residual stresses significantly.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4521 - 4530
Copyright
Copyright © Materials Research Society 1999

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