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The Substructure of Austenite and Martensite Through a Carburized Surface

  • J. D. Makinaon (a1), W. N. Weins (a1) and R. J. De Angelis (a1)

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.

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[1] Jatczak, C. F., “Retained Austenite and its Measurement by X-Ray Diffraction,” SAE, Warrendale, PA 1980.
[2] “Metals Handbook, Properties and Selection: Iron and Steels,” 9th ed, ASM, Materials Park, OH 1985.
[3] “International Tables for X-Ray Crystallography,” v3, Kynoch, Birmingham, 1969.
[4] Cullity, B. D., “Elements of X-Ray Diffraction,” 2nd Ed. Addison Wesley 1978.
[5] DeAngelis, R. J., Dhere, A., Lewis, J., Kuo, H., “Techniques to Study the Sintering of Catalysts”, Sintering and Heterogeneous Catalysis, p.181, Plenum, 1984.
[6] Warren, B. E., “X-Ray Diffraction,” Addison Wesley 1969.
[7] Severdenko, V. P. et al. X-ray Diffraction Analysis of Stacking Faults in the Residual Austenite of Cr-W Steel 5Kh2VMNF After Low- Temperature Thermomechanical Treatment, Izvest. Akad. Nauk Beloruss. SSR.1975.

The Substructure of Austenite and Martensite Through a Carburized Surface

  • J. D. Makinaon (a1), W. N. Weins (a1) and R. J. De Angelis (a1)

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