1978 Volume 21 Issue 156 Pages 939-947
This paper deals with the fatigue crack growth behavior of an anisotropic rolled steel plate (SB56M). Two groups of materials were prepared by annealing and spheroidizing treatments, so that the effects of the laminated structure and the mechanical fibering of inclusion, both of which were produced by rolling, could be separated. The fatigue crack growth behavior in various anisotropy directions was examined microscopically as well as macroscopically. The crack growth behavior was much more anisotropic with the annealed material than with the spheroidized material. It is concluded with this class of the steel plate investigated that the anisotropy in the behavior of crack growth on the microscopic and macroscopic levels was primarily affected and controlled by the laminate structure, while the inclusions gave a secondary effect on the anisotropy of crack growth.
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