RELATION BETWEEN K SUB Ic AND MICROSCOPIC STRENGTH FOR LOW ALLOY STEELS.
CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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A simple model was developed to determine K sub Ic in terms of the microscopic cleavage strength and the tensile yield strength for low temperature cleavage fracture in A302B and A533 reactor grade quenched and tempered steels. The model applies at sufficiently low temperatures or in irradiated steels where microscopic cleavage strength or 3.4 tensile yield strength. It was determined that microscopic cleavage strength is independent of temperature below -150F and then increases with increasing temperature. At this time, it appears that microscopic cleavage strength is independent of irradiation. At temperatures above that at which microscopic cleavage strength or 3.4 tensile yield strength, unstable fracture initiates when a critical plastic strain is achieved near to the crack tip. The critical local plastic strain for unstable fracture also increases with increasing temperature. Author
- Metallurgy and Metallography