Conclusions
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1.
The presence of a brittle case leads to a change in the type of macrofracture of samples subjected to impact tests — plastic deformation is prevented although the fine structure of the fracture remains unchanged.
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2.
A brittle case has no effect on the cold brittleness threshold.
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3.
In the presence of a brittle case there is no macroplastic deformation of the sample before formation of the crack (the work of crack initiation) or during propagation of the crack.
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4.
The impact toughness of samples with a brittle case characterizes the work of crack propagation alone.
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Literature cited
A. P. Gulyaev, V. D. Zelenova, and I. V. Shermazan, Zavod. Lab., No. 7 (1968).
G. Irwin, Engineering Fracture Mechanics, 1, No. 2 (1968).
Applied Problems of Ductile Fracture [Russian translation], Mir (1968).
G. A. Beresenev, V. P. Vylezhnev, and V. I. Sarrak, Metal. i Term. Obrabotka Metal., No. 6 (1968).
Additional information
Central Scientific-Research Automobile and Automotive Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 49–51, June, 1970.
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Zelenova, V.D. Resistance to brittle fracture of case-hardened steel. Met Sci Heat Treat 12, 496–498 (1970). https://doi.org/10.1007/BF00668860
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DOI: https://doi.org/10.1007/BF00668860