Conclusions
-
1.
The use of high-temperature metallography and a vacuum stage makes it possible to reveal different mechanisms of austenite grain growth in carbon and alloy structural steels.
-
2.
It was found that austenite grain growth occurs at 850–1250° by three different mechanisms: I) resorption of grains; II) formation of new boundaries and grains; III) boundary migration. The first and second mechanisms are accompanied by decomposition of old boundaries and the third is characterized by movement of the boundaries.
-
3.
Resorption of grains predominates at temperatures 50–100° above Ac3, and the formation of new more even boundaries at temperatures 250–300° above Ac3. Boundary migration occurs at all temperatures but affects grain growth only above 1100°.
-
4.
The resorption of grains evidently depends on rebuilding of dislocation arrays, and the formation of new grain boundaries on rebuilding of dislocation arrays and movement of atoms. The process of boundary migration may be determined by the movement of dislocation groups and collective diffusional movements of atoms.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature cited
E. S. MacLean, Grain Boundaries in Metals [Russian Translation], Metallurgizdat, Moscow (1960).
S. S. Gorelik, Recrystallization of Metals and Alloys [in Russian], Metallurgiya, Moscow (1967).
V. D. Sadovskii, "Structural mechanism of the formation of austenite on heating of steel", in: Structural and Phase Transformations during Heating of Steels and Alloys [in Russian], Perm' (1969).
N. N. Lipchin, "Mechanism of the occurrence and elimination of structural inheritance in steel", in: Structural and Phase Transformations during Heating of Steels and Alloys [in Russian], Perm' (1969).
K. G. Ost and J. V. Rattech, "Migration of grain boundaries", in: Recovery and Recrystallization of Metals [Russian translation], Metallurgiya, Moscow (1966).
S. S. D'yachenko, "Principle of the crystallogeometric relationship during heating and structural inheritance in steels", in: Structural and Phase Transformations during Heating of Steels and Alloys [in Russian], Perm' (1969).
M. G. Lozinskii, Structure and Properties of Metals and Alloys at High Temperatures [in Russian], Metallurgizdat, Moscow (1963).
S. S. D'yachenko, I. V. Doshchechkina, and A. M. Petrichenko, "The orientation α→γ transformation in annealed steels and the mechanism by which it occurs", in: Structural and Phase Transformations during Heating of Steels and Alloys [in Russian], Perm' (1969).
K. Stransky and M. Karlowa, Metal Treatment,31, 226, 255–267 (1964).
G. A. Faivilevich, G. A. Torpanova, and L. A. Nikitina, in: New Methods of Testing Metals [in Russian], No. 38, Metallurgiya, Moscow (1964), pp. 105–111.
I. Yu. Ul'yanina, G. A. Faivilevich, and S. S. Kol'be, "Use of getters in high-temperature investigations of structure", in: New Methods of Testing Metals [in Russian], No. 79 (1971), pp. 173–174.
S. V. Zagulyaeva and M. I. Vinograd, "Austenite grain growth in structural steel", Metal. i Term. Obrabotka Metal., 7, 2–4 (1971).
A. P. Gulyaev and R. P. Leshchinskaya, "Intercrystalline fracture in high-speed steel", Metal. i Term. Obrabotka Metal., 9, 22–27 (1963).
M. A. Krishtal, Yu. I. Davydov, and M. I. Lerner, "Mechanism of secondary recrystallization in powdered tungsten", in: Interactions between Dislocations and Impurity Atoms in Metals and Alloys [in Russian], Tul'skii Politekhnicheskii Institut, Tula (1969), pp. 256–262.
Additional information
Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 5–11, January, 1975.
Rights and permissions
About this article
Cite this article
Vinograd, M.I., Ul'yanina, I.Y. & Faivilevich, G.A. Mechanism of austenite grain growth in structural steels. Met Sci Heat Treat 17, 5–9 (1975). https://doi.org/10.1007/BF00663078
Issue Date:
DOI: https://doi.org/10.1007/BF00663078