Characterization of phosphorus segregation in neutron-irradiated pressure vessel steels by atom probe field ion microscopy

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An atom probe field ion microscopy characterization of A533B and Russian VVER 440 and 1000 pressure vessel steels has been performed to determine the phosphorus coverage of grain and lath boundaries. Field ion micrographs of grain and lath boundaries have revealed that they are decorated with a semi-continuous film of discrete brightly-imaging precipitates that were identified as molybdenum carbonitride precipitates. In addition, extremely high phosphorus levels were measured at the boundaries. The phosphorus segregation was found to be confined to an extremely narrow region indicative of monolayer-type segregation. The phosphorus coverages determined from the atom probe results of the unirradiated ... continued below

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6 p.

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Miller, M. K.; Jayaram, R. & Russell, K. F. April 1995.

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An atom probe field ion microscopy characterization of A533B and Russian VVER 440 and 1000 pressure vessel steels has been performed to determine the phosphorus coverage of grain and lath boundaries. Field ion micrographs of grain and lath boundaries have revealed that they are decorated with a semi-continuous film of discrete brightly-imaging precipitates that were identified as molybdenum carbonitride precipitates. In addition, extremely high phosphorus levels were measured at the boundaries. The phosphorus segregation was found to be confined to an extremely narrow region indicative of monolayer-type segregation. The phosphorus coverages determined from the atom probe results of the unirradiated materials were in excellent agreement with predictions based on McLean`s equilibrium model of grain boundary segregation. The boundary phosphorus coverage of a neutron-irradiated weld material was significantly higher than that observed in the unirradiated material.

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6 p.

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INIS; OSTI as DE95009129

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95009129
  • Report No.: CONF-941144--109
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 39118
  • Archival Resource Key: ark:/67531/metadc682407

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  • April 1995

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 19, 2015, 12:24 p.m.

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Miller, M. K.; Jayaram, R. & Russell, K. F. Characterization of phosphorus segregation in neutron-irradiated pressure vessel steels by atom probe field ion microscopy, article, April 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc682407/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.