Conclusions
-
l.
At the beginning of martensitic transformation there occurs a “cold” plastic deformation of austenite, which is replaced by the compression of residual austenite after a considerable hardening as the quantity of martensite begins to increase. Damping of the plastic deformation and the compression of residual austenite are followed by an intensive growth of the microscopic and submicroscopic distortions.
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2.
The diminution of the lattice parameter in the process of martensitic transformation, and its increase at the first stage of tempering, occur without diffusion.
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3.
The lattice parameter of residual austenite in steels is always smaller than that of pure austenite.
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4.
The total value by which the lattice parameter of residual austenite is reduced in the process of martensitic transformation may be determined at the initial tempering stage.
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5.
The presence of residual austenite in hardened steels is due to submicroscopic distortions in austenite and the stresses of all-round compression.
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References
P.M. Yushkevich, “Physical Metallurgy and Metallography”, Vol. 8, No. 6, 1959.
E. Houdremont and Kirsement, O. “Archiv Eisenhuettenwesen”, H. 1/2, 1953.
P.M. Yushkevich, “Metallography and Heat-Treatment of Metals”, No. 2, 1960.
A.I. Stregulin and Chuprikova, N.P. “Reports of the USSR Academy of Sciences”, Vol. 105, No. 6, 1955.
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Yushkevich, P.M. All-round compression and phase hardening of residual austenite. Met Sci Heat Treat 3, 297–299 (1961). https://doi.org/10.1007/BF00810378
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DOI: https://doi.org/10.1007/BF00810378