Abstract
1. Spring steels 65G and 60S2A with a lower-bainite structure (isothermal hardening) are characterized by intercrystallite fracture and a discontinuous, intermittent failure, which corresponds to the serrated section on the failure diagram. In the steel with a structure of tempered martensite (quenching+tempering), failure occurs monotonically. 2. It can be assumed on the basis of analysis of the structure of the isothermally treated steel that discontinuous crack growth may be caused by the martensitic transformation of sections of residual austenite under stress in the crack tip. 3. The crack resistance of the isothermally treated steel is lower, and the resilience and relative elongation higher than those in the quenched and tempered steel.
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