Conclusions
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1.
A difference in the irreversible change of length results from the heating ⇌ cooling cycle in the temperature range of phase transformations, depending on the degree of preliminary deformation.
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2.
The largest irreversible change in length in the process of the α→γ→α transformation occurs in undeformed samples. No irreversible changes in length during the α→γ→α transformation are observed in samples previously deformed 75%.
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3.
The effect of the degree of deformation on the irreversible change in length is due to the α→γ transformation during heating.
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4.
Preliminary tempering at 650° makes the irreversible change in length during phase transformation independent of the degree of preliminary deformation.
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5.
The irreversible change in length in the heating ⇌ cooling cycle resulting from different degrees of preliminary deformation may be one reason for warping during heat treatment.
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Literature cited
P. Adam et al., Arch. Eisenhüttenw., 12, 1153–1159 (1970).
F. Richter and U. Lotter, Arch. Eisenhüttenw., 4, 303–306 (1972).
Additional information
Moscow Automobile Factory. NAMI. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 44–47, August, 1974.
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Bulgakov, V.A., Zelenova, V.D. & Kal'ner, V.D. Effect of cold working on the change in length of steel during heating and cooling. Met Sci Heat Treat 16, 683–685 (1974). https://doi.org/10.1007/BF00658436
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DOI: https://doi.org/10.1007/BF00658436