Use of subsized specimen for evaluating the strength and fracture toughness of irradiated 2 1/4 Cr-1 M(subscript 0) steel

Article Abstract:

Small punch specimens were used to determine strength and fracture toughness of irradiated 2 1/4 Cr-1 M(sub 0) steel for possible use in nuclear reactor pressure vessels. Small punch and tensile tests were performed by punching unirradiated and irradiated steel using an Instron in a radiation shielded hot cell. For both tests, yield strength increases 29% due to radiation hardening while ultimate tensile stress increases 21%. Fracture toughness of irradiated and unirradiated steel decreases about 37% after irradiation to a fluence of 3.2 x 10 (super 23) n/m (super 2).

Materials, Nuclear reactors, Radiation effects, Metals, Effect of radiation on

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Melt processing of bulk YBaCuO superconductors with high J(subscript c)

Article Abstract:

Various melt processes are performed to determine the conditions that will raise J(sub c) values in bulk YBaCuO. Results show that higher J(sub c) values depend on the control of the precursor microstructure just above the peritectic temperature. Reducing the size of 211 phase particles raises J(sub c) values. High critical density in large magnetic fields can be obtained through grain alignments and introduction of pinning centers.

Superconductors

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Fatigue behavior of Chromium steel surface deposits

Article Abstract:

Chromium steel surface deposits were postheated to 350 degrees Celsius. For fatigue crack growth threshold values of the stress intensity factor between 11-13 MPa m(superscript 1/2), three different propagation kinetics were observed, suggesting that environmental factors affect crack growth. Fracture toughness is dependent on vanadium or columbium content and more of both will decrease fracture toughness.

Fracture mechanics, Chrome steel, Metals at high temperatures, High temperature materials

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