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High strength state in low carbon steel with submicron fibrous structure

✍ Scribed by A.V. Korznikov; I.M. Safarov; A.A. Nazarov; R.Z. Valiev

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
685 KB
Volume
206
Category
Article
ISSN
0921-5093

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✦ Synopsis

The formation of a submicron fibrous (SMF) structure in low carbon low alloy steels under severe warm rolling is investigated. It is shown that by varying modes of deformation one can obtain structures with either equilibrium or nonequilibrium grain boundaries (GBs). It is established that SMF structure provides for a sharp increase in strength properties (by a factor of 23) as compared to those of coarse-grained material. An analysis of this effect based on Hall-Patch relation models is given.

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The influence of multiple overload at various stress intensity levels (AK) in the linear regime of Paris plot was studied in high strength low alloy structural steel SANH-55. It was observed that crack retardation increases by increasing the overload ratio and the number of overloads. Saturation eff