Abstract
The results of a range of different small scale material characterisation tests were correlated with the crack arrest temperature at 2 3 the yield strength of a number of modern ferritic steels and their weldments. The crack arrest temperature was determined experimentally using large scale structurally representative double tension tests. The comparison of small and large scale tests indicates that a safe estimate of the crack arrest temperature for the steels and welds investigated can be obtained using the nil-ductility transition temperature plus 40°C. The 50% fracture appearance transition temperature or the 20% fracture appearance transition temperature plus 20°C obtained from full thickness drop weight tear test are also reliable measures of the lower bound crack arrest temperatures.
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