Abstract
We have investigated the effect of preliminary plastic compression on the characteristics of brittle fracture in bcc metals using 15Kh2MFA pearlitic steel as an example. We have experimentally established that preliminary plastic compression of the material leads to a change in the mechanism of brittle fracture from transcrystallite to intercrystallite. We have shown that the critical stress for brittle fracture is significantly lower for the intercrystallite mechanism than for the transcrystallite mechanism. We suggest mechanisms for embrittlement of material as a result of its preliminary plastic compression. We present schemes for the transition from intercrystallite fracture to transcrystallite, depending on the thermal and mechanical loading conditions for the precompressed material.
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