Fatigue crack growth behavior of pressure vessel steels and submerged arc weldments in a high-temperature pressurized water environment |
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Authors: | P K Liaw W A Logsdon J A Begley |
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Affiliation: | (1) Westinghouse Research and Development Center, 1310 Beulah Road, 153 Pittsburgh, PA |
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Abstract: | The fatigue crack growth rate (FCGR) properties of SA508 C1 2a and SA533 Gr A C1 2 pressure vessel steels and the corresponding
automatic submerged are weldments were developed in a high-temperature pressurized water (HPW) environment at 288 °C (550°F)
and 7.2 MPa (1044 psi) at load ratios of 0.02 and 0.50. The HPW enviromment FCGR properties of these pressure vessel steels
and submerged arc weldments were generally conservative, compared with the approrpriate American Society of Mechanical Engineers
(ASME) Section XI water environmental reference curve. The growth rate of fatigue cracks in the base materials, however, was
considerably faster in the HPW environment than in a corresponding 288°C (550°F) base line air environment. The growth rate
of fatigue cracks in the two submerged are weldments was also accelerated in the HPW environment but to a significantly lesser
degree than that demonstrated by the corresponding base materials. In the air environment, fatigue striations were observed,
independent of material and load ratio, while in the HPW environment, some intergranular facets were present. The greater
environmental effect on crack growth rates displayed by the base materials, as compared with the weldments, was attributed
to a different sulfide composition and morphology. |
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