SEM fractography revealed no distinct features at the initiation sites of steel A. In all cases, steel A showed better cleavage resistance than steel B. Optical and scanning electron microscopy were used for microstructural and fractographic analysis. Toughness was measured using instrumented precracked Charpy, Charpy-V-notch, and double crack, 4-point bend tests.
Coarse grain heat affected zone (CGHAZ) specimens were produced by Gleeble simulation. Steel A was microalloyed with 0.076V, 0.028Nb, and 0.011 Ti, while steel B contained 0.048Ti. The toughness of two microalloyed, thermomechanical control process steels were investigated (steels A and B). This data is applicable to evaluate flaw stability of the storage tanks that are operated above 70 degrees Fahrenheit since, even at 40 degrees Fahrenheit, crack advance is observed to proceed by ductile tearing. However, unstable cleavage crack extension can be initiated during cold starts if a sufficiently long crack is = 15 ft-lb), are presented. Variation in inclusion content, microstructure, yield and tensile strengths, and ductile to brittle transition temperature had no effect on the crack growth rate of 1 Cr-Mo-V rotor steels brittle cleavage modes of fatigue were not observed in either continuous or intermittently strain aged specimens tested at ambient temperature. In addition the tensile properties above the temperature range of 0/sup 0/ to 538/sup 0/C have been evaluated using cylindrical tensile specimens. The impact properties of these steels above the temperature range of -62 - +100/sup 0/C have also been determined using both standard and precracked Charpy specimens. The effects of inclusion content, manufacturing processes, and repeated aging on the rate of subcritical crack growth at room temperature have been investigated using compact tension specimens.
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(See instructions if you don't know how to install: Instructions on how to install)ĥ.Fatigue crack growth and plane strain fracture toughness have been examined in three 1 Cr-Mo-V bainitic steam generator rotor steels. Request a game or request re-upload, visit Game Request
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