Abstract
1. The presence in the microstructure of steel 25KhGSA quenched from 760–780° and tempered at 500° for 1 h of ∼20% free ferrite or even a substantial difference in austenite grain size (from grade 2 to grade 8) increases its notch sensitivity in uniaxial and also biaxial tension. 2. Steel 25KhGSA quenched from 880° and tempered, at 500° for 1 h with a structure of sorbite and an austenite grain size of grade 9 is not sensitive to a notch in the form of a narrow slit 4 mm long and 0.1–0.15 mm wide in biaxial tension. 3. The deformed condition differs substantially in biaxial and uniaxial tension. Longitudinal deformation e1 is 50–100% smaller in biaxial tension than in uniaxial tension; transverse deformation is completely restricted (e2=0), while e2=0.5e1 in uniaxial tension.
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