Fracture behavior of two ultrahigh carbon steels
DOI:
https://doi.org/10.3989/revmetalm.2001.v37.i2.501Keywords:
UHC steels, Barker fracture test, Toughness, Crack growth behavior, Carbide size, Elastic energy,Abstract
Two ultrahigh carbon steels containing 1.3 and 1.5 pet carbon have been tested for their plane-strain (Chevron-notch) fracture toughness using Barker tests. The microstructure of these two materials consisted of fine carbides dispersed in a ferrite matrix. Fracture toughness of UHC-1.3 C was twice that of UHC-1.5 C. This result can be readily explained by means of the difference in size of the carbide particles found in each microstructure. The crack growth mechanism consisted of ductile tearing at the notch tip region followed by nucleation of a brittle crack at carbides. Crack propagation in the UHC-1.3 C specimen occurred unstably and smooth crack growth behavior was observed in UHC-1.5 C. The difference in crack growth behavior was attributed to the elastic energy stored in the grips, which was higher for the UHC-1.3 C test than for the UHC-1.5 C test.
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