Abstract
Creep crack growth tests under vacuum at 565 °C were conducted on small (10 mm × 10 mm cross-section) single-edge notch bend specimens of a 0.5Cr0.5Mo0.25V steel. The effect of varying the microstructure from bainite, to the ferrite-pearlite state was investigated. Crack lengths and crack-opening displacements were recorded as a function of time and were related to the applied stresses and to the material microstructures. The presence of small amounts of ferrite in an otherwise bainitic structure had a marked effect on crack growth rates. The formation of 15% bainite in an otherwise ferritic structure drastically reduced the ductility. This was attributed, in part, to the lower creep strength of the ferrite-pearlite resulting from a slow cooling rate from the austenitising temperature which allowed heavy carbide precipitation and overaging.
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