Thermal embrittlement of carbon steels in canistered waste disposal containers

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It is known that fracture toughness in steels, especially in low steels, in severely reduced by exposure at the temperature range of 350-575{degrees}C through isothermal aging or slow cooling. It is also well recognized that segregation of impurities, such as Sb, P, Sn, As, along prior austenite grain boundaries is the main cause of thermal (temper) embrittlement. The most potent embrittling elements, in order of decreasing potency, are Sb, Sn, P, and As. However, Sb, Sn, and As are not generally present in steels. Therefore P is usually the most concerned element in steels. McMahon has concluded in his review ... continued below

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6 p.

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Huang, J. S. March 1, 1998.

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Description

It is known that fracture toughness in steels, especially in low steels, in severely reduced by exposure at the temperature range of 350-575{degrees}C through isothermal aging or slow cooling. It is also well recognized that segregation of impurities, such as Sb, P, Sn, As, along prior austenite grain boundaries is the main cause of thermal (temper) embrittlement. The most potent embrittling elements, in order of decreasing potency, are Sb, Sn, P, and As. However, Sb, Sn, and As are not generally present in steels. Therefore P is usually the most concerned element in steels. McMahon has concluded in his review that plain C steels containing less than 0.5 wt% Mn are not susceptible to temper embrittlement. However, he also noted the strong effect of Mn as an enhancement of the P aging of plain C-Mn steels, particularly high Mn contents, to disregard the possibility of thermal embrittlement. A516 plain carbon steels has been been proposed as a corrosion allowable material (CRM) for the outer barrier of canistered waste disposal containers. The expected peak temperature for a waste package container if as high as 200{degrees}C for many years. Therefore concern has been raised whether thermal embrittlement would occur in this steel after the long term temperature exposure expected in the current nuclear waste packages. The current report documents our recent analysis for this problem.

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6 p.

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OSTI as DE98058338

Other: FDE: PDF; PL:

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  • Other Information: PBD: 1 Mar 1998

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  • Other: DE98058338
  • Report No.: UCRL-ID--130062
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/654372 | External Link
  • Office of Scientific & Technical Information Report Number: 654372
  • Archival Resource Key: ark:/67531/metadc702950

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 5:56 p.m.

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Huang, J. S. Thermal embrittlement of carbon steels in canistered waste disposal containers, report, March 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc702950/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.