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THE INFLUENCE OF PLASTIC PRESTRAINING ON BRITTLE FRACTURE RESISTANCE OF METALLIC MATERIALS WITH CRACKS
Author(s) -
Pokrovsky V. V.,
Troshchenko V. T.,
Kopcmsky G. A.,
Kaplunenko V. G.,
Fiodorov V. G.,
Dragunov Yu. G.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb00897.x
Subject(s) - materials science , embrittlement , brittleness , brittle fracture , composite material , fracture (geology) , metallurgy , work hardening , hardening (computing) , microstructure , layer (electronics)
The purpose of the present work was to study the influence of different regimes of overloading of pressure vessel steels in different states which correspond to the steel properties at the beginning of a reactor operation and at different degrees of embrittlement (simulated by heat treatment). The experiments were performed on 25, 50 and 150 mm thick specimens with short and long cracks of various shape in the temperature range from 293 to 623 K corresponding to the service temperature range of those steels. The following factors were investigated contribution of different effects (residual stresses, strain hardening, crack tip blunting) into the enhancement of the brittle fracture resistance of steels after warm prestressing, stability of the positive warm prestressing effect during subsequent exposure of the steels to different service loading conditions; size effect on optimal regimes of thermo‐mechanical prestressing and on the brittle fracture resistance characteristics of the steels studied after warm‐prestressing. An approach is proposed to predict the increase in the brittle fracture resistance of steels with cracks after warm prestressing.