Fracture toughness of Alloy 690 and EN52 weld in air and water

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The effect of low and high temperature water with high hydrogen on the fracture toughness of Alloy 690 and its weld, EN52, was characterized using elastic-plastic J{sub IC} methodology. While both materials display excellent fracture resistance in air and elevated temperature (>93 C) water, a dramatic degradation in toughness is observed in 54 C water. The loss of toughness is associated with a hydrogen-induced intergranular cracking mechanism where hydrogen is picked up from the water. Comparison of the cracking behavior in low temperature water with that for hydrogen-precharged specimens tested in air indicates that the critical local hydrogen content required ... continued below

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38 p.

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Brown, C.M. & Mills, W.J. June 1, 1999.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

The effect of low and high temperature water with high hydrogen on the fracture toughness of Alloy 690 and its weld, EN52, was characterized using elastic-plastic J{sub IC} methodology. While both materials display excellent fracture resistance in air and elevated temperature (>93 C) water, a dramatic degradation in toughness is observed in 54 C water. The loss of toughness is associated with a hydrogen-induced intergranular cracking mechanism where hydrogen is picked up from the water. Comparison of the cracking behavior in low temperature water with that for hydrogen-precharged specimens tested in air indicates that the critical local hydrogen content required to cause low temperature embrittlement is on the order of 120 to 160 ppm. Loading rate studies show that the cracking resistance is significantly improved at rates above ca. 1000 MPa{radical}m/h because there is insufficient time to produce grain boundary embrittlement. Electron fractographic examinations were performed to correlate cracking behavior with microstructural features and operative fracture mechanics.

Physical Description

38 p.

Notes

OSTI as DE00755362

Medium: P; Size: 38 pages

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  • Other Information: PBD: 1 Jun 1999

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  • Report No.: B-T-3265
  • Grant Number: AC11-98PN38206
  • DOI: 10.2172/755362 | External Link
  • Office of Scientific & Technical Information Report Number: 755362
  • Archival Resource Key: ark:/67531/metadc710445

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  • June 1, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:35 p.m.

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Brown, C.M. & Mills, W.J. Fracture toughness of Alloy 690 and EN52 weld in air and water, report, June 1, 1999; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc710445/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.