Abstract
Distinct contours of traces of local yield layers (LYL) are observed on surfaces of tensioned specimens formed from heat-treated steel 09G2S (COST 19282-73). Single- and bimetallic specimens (basic layer — steel 09G2S, plating — stainless steel 12Kh18N10T) were investigated. In the bimetallic specimens, LYL are generated near the surface of the ferrous metal, intersect the broad face at an angle of 54.7°, and approach the surface of the plating layer at an angle of π/2; the trajectory of the curved sections of the traces on the narrow faces is approximated by a logarithmic spiral, for which the angle between the radiusvector and the tangent is equal to arctan 1/√2. It is proposed that an LYL in an elastically deformed metal is developed by conversion of a portion of the volume adjacent to the mouth of the layer to plastic metal.
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