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The Substructure of Austenite and Martensite Through a Carburized Surface

Published online by Cambridge University Press:  06 March 2019

J. D. Makinaon ,
W. N. Weins  and
R. J. De Angelis
J. D. Makinaon
Affiliation:
Department of Mechanical Engineering Center for Materials Research and Analysis University of Nebraska-Lincoln Lincoln, NE 68588-0656
W. N. Weins
Affiliation:
Department of Mechanical Engineering Center for Materials Research and Analysis University of Nebraska-Lincoln Lincoln, NE 68588-0656
R. J. De Angelis
Affiliation:
Department of Mechanical Engineering Center for Materials Research and Analysis University of Nebraska-Lincoln Lincoln, NE 68588-0656
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Abstract

The complex relationships among composition, roartensite start and finish temperatures, morphology of the martensite, residual stress distribution, and quenching conditions produce significant microstructural changes through a carburized case. Variations in the amount of retained austenite, the diffracting-particle size, and hardness were measured every 50μm in depth through a one percent carbon case on AISI-SAE 4320 steel. Measurement were made to a total depth of 2 mm. The percent retained austenite decreases from a maximum of 26% near the surface to a few percent in the bulk. It is shown that the x-ray diffracting-particle size of the martenaite phase is a structure parameter that changes when the martensite morphology goes from plate to lath type. The austenite phase diffracting-particle size is controlled hy the deformatioxis induced by the martensite formation.

Type
X. Crystallite Size/Strain Analysis
Information
Advances in X-Ray Analysis , Volume 34: Thirty-Ninth Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1990 , 1990 , pp. 483 - 491
Copyright
Copyright © International Centre for Diffraction Data 1990

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References

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