Research Designed to Evaluate Zr-2.5nb and Zr-2.5nb-0.5cu Alloys for Delayed Failure Hydride Susceptibility. Quarterly Report No. 3, April 15, 1963-July 14, 1963

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A program is in progress to determine the extent to which Zr-2.5Nb and Zr--2.5Nb-0.5Cu exhibit delayed failure under various conditions of hydrogen content, heat treatment, ambient temperature, and specimen geometry. Specimens are hydrogenated to 200 or 500 ppm in a modified Sieverts apparatus, heat treated or cold reduced (150 deg C), and then evaluated in dynamic tensile and delayed failure tests. Data presented on the ternary alloy show that the beta-quenched and aged condition promotes a high sensitivity to static fatigue fracture. At room temperature, unnotched specimens containing 500 ppm hydrogen showed ordinary dynamic tensile stress-strain properties with very good ... continued below

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Weinstein, D. & Holtz, F. C. July 1, 1963.

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  • IIT Research Institute
    Publisher Info: Illinois inst. of Tech., Chicago. IIT Research Inst.
    Place of Publication: Chicago, Illinois

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Description

A program is in progress to determine the extent to which Zr-2.5Nb and Zr--2.5Nb-0.5Cu exhibit delayed failure under various conditions of hydrogen content, heat treatment, ambient temperature, and specimen geometry. Specimens are hydrogenated to 200 or 500 ppm in a modified Sieverts apparatus, heat treated or cold reduced (150 deg C), and then evaluated in dynamic tensile and delayed failure tests. Data presented on the ternary alloy show that the beta-quenched and aged condition promotes a high sensitivity to static fatigue fracture. At room temperature, unnotched specimens containing 500 ppm hydrogen showed ordinary dynamic tensile stress-strain properties with very good values of strength and elongation. However, at an applied stress of 95% of the yield stress, static fracture-in the absence of macroscopic plastic deformation---occurred after several hundred hours. Photomicrographs are presented showing the brittle crack propagation through the microstructure; mechanisms for such behavior are still speculative, however. (auth)

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: IITRI-B6005-8
  • Grant Number: AT(11-1)-578
  • DOI: 10.2172/4654966 | External Link
  • Office of Scientific & Technical Information Report Number: 4654966
  • Archival Resource Key: ark:/67531/metadc1034936

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  • July 1, 1963

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  • Oct. 18, 2017, 7:39 a.m.

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  • Jan. 22, 2018, 4 p.m.

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Weinstein, D. & Holtz, F. C. Research Designed to Evaluate Zr-2.5nb and Zr-2.5nb-0.5cu Alloys for Delayed Failure Hydride Susceptibility. Quarterly Report No. 3, April 15, 1963-July 14, 1963, report, July 1, 1963; Chicago, Illinois. (digital.library.unt.edu/ark:/67531/metadc1034936/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.