Grain-size effects in the quasi-static fracture resistance of a thermally embrittled RPV steel (quenched and tempered microstructures) |
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Authors: | J R Tarpani W W Bose Filho D Spinelli |
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Affiliation: | 1. Materials, Aeronautical and Automotive Engineering Department-SMM, Engineering School of S?o Carlos-EESC, University of S?o Paulo-USP, Av. Trabalhador S?o-Carlense, 400, 13566-590, S?o Carlos, SP, Brazil
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Abstract: | The elastic-plastic fracture toughness and crack extension behavior under the quasi-static loading regimen of several thermally
embrittled conditions of a nuclear reactor pressure vessel (RPV) steel were assessed on the basis of microstructural parameters.
It was discovered that the bainite packet size is the fracture properties controlling parameter of single-phase quenched and
tempered microstructures. Results were found in close agreement to those obtained in a parallel study with dual-phase annealed
microstructures derived from the same low alloy steel. Similarly, it was concluded that a Hall-Petch type relationship correlates
J-fracture mechanics criteria to the grain size. |
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Keywords: | fracture toughness Hall-Petch relationship J-R curve neutron damage simulation RPV steel |
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