Abstract
1. The temperature boundaries of applicability of the criteria of static (KIc) and dynamic (KId) crack resistance for die steels are determined from the following relationships: KId KIc above 300°C. 2. In short-term static tests of die steels above 300°C the specimens fail brittlely according to the intergranular mechanism, which is caused by precipitation of carbide phase over practically the whole extent of the grain boundaries. 3. The method of crack resistance tests in dynamic loading in the area of die service temperatures provides an upper evaluation of the values of brittle strength and is weakly sensitive to changes in the structure factor and transitions from one fracture micromechanism (intragranular) to another (intergranular). 4. The crack resistance of hot work die steels must be evaluated using the values of static crack resistance as the result of the more complex agreement of the test parameters with the service conditions of the die metal.
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