Conclusions
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1.
We studied the effect of preliminary plastic deformation on the mechanical characteristics of steel 15Kh2MFA, with σ0.2=950 MPa and 540 MPa, in short-term tension.
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2.
It was established that different fracture mechanisms exist in steel 15Kh2MFA, depending on the strength (yield point). In the first stage of plastic deformation of smooth specimens of steels 15Kh2MFA (I) and 15Kh2MFA (II), microscopic pores are formed and grow in the direction of the action of the force. Subsequently, along with an increase in pore size in the longitudinal direction, in steel 15Kh2MFA (I) there is also an increase in size in the transverse direction and coalescence of pores. The latter is responsible for the occurrence of a dimpled fracture. In steel 15Kh2MFA (II), the direction of pore growth and coalescence remains lengthwise up to the formation of microcracks and longitudinal lamination at the stage preceding specimen fracture. In this case, the fracture is usually brittle and occurs along the grain boundaries.
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3.
The last stage of fracture is characterized by rapid pore growth and coalescence and microcrack formation. The fracture criterion which is independent of the degree of preliminary plastic deformation is the technical cohesive strength.
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Translated from Problemy Prochnosti, No. 9, pp. 41–45, September, 1988.
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Yasnii, P.V., Pokrovskii, V.V., Shtukaturova, A.S. et al. Study of the effect of preliminary plastic deformation on the mechanical properties and microstructure of structural steel. Strength Mater 20, 1178–1182 (1988). https://doi.org/10.1007/BF02082735
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DOI: https://doi.org/10.1007/BF02082735