Abstract
This investigation deals with the tensile properties and the fracture toughness obtained by dynamic or static strain aging of the ausformed or the conventionally heat treated steel containing 9%W-2.5%Cr. The results obtained are as follows:(1) The ultimate tensile strength and the yield strength of the conventionally heat treated steel are increased by the dynamic strain aging, but the fracture toughness and the elongation are decreased.(2) The ultimate tensile strength and the yield strength of the ausformed steel are considerably increased without any decrease of the fracture toughness by the dynamic strain aging, but the elongation is decreased.(3) The pretempering prior to dynamic strain aging decreases the fracture toughness and the elongation of both steels.(4) The maximum strength of both steels are obtained by the dynamic strain aging at about 300°C.(5) The best combination of the tensile properties and the fracture toughness of both steels is obtained by the post tempering at about 500°C.(6) In the case of the conventionally heat treated steel which was not subjected to pretempering, the fracture toughness and the elongation of the dynamic strain aged steel are larger than those of the static strain aged steel. In the case of the ausformed steel, no significant difference between the static and dynamic strain aging treatments can be found.
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