Author(s)

V. Goritski, V. Larionov & V. Lazoutine

Abstract

Influence of structure and service conditions on mechanism and rate of fatigue crack propagation in low-alloy steels V. Goritslu, V. Larionov & V. Lazoutine Melnikov Central Research and Design Institute of Steel Structures, Moscow, Russia Abstract The paper investigates the influence of the structure type (ferrite, ferrite + perlite and tempered sorbite) and the structure parameters (grain and subgrain sizes, size and distribution of sulphide particles) on the mechanism and rate of fatigue crack propagation in low-alloy structural steels. The investigation results are obtained using electron microscopy (on foil and carbon replicas) and scanning techniques. 1 Introduction It is known [I-31 that the structure of steel significantly influences the characteristics of cyclic crack resistance to fatigue fractures in structural steels. In this process the degree of influence on the fatigue crack growth rate depends on a value range of the coefficient of stress intensity AK. According to data [I], at

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