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Cryogenic fracture toughness of 9Ni steel enhanced through grain refinement

  • Mechanical Behavior
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Abstract

A thermal cycling technique was used to refine the grain size of commercial “9Ni” cryogenic steel. The grain refined alloy was then tempered, a treatment which introduced a small admixture of retained austenite. The reprocessed alloy shows an excellent combination of strength and toughness to temperatures as low as 6 K, and shows little evidence of embrittlement in liquid helium. The microstructure and mechanical properties of the reprocessed alloy are described and compared to those obtained through conventional treatment.

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Author notes

  1. Sungho Jin (Assistant Research Engineer, Member of Research Staff)

    Present address: Bell Laboratories, Metallurgical Engineering Department, Murray Hill, NJ

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of California, Berkeley, CA

    Chol K. Syn (Assistant Research Engineer), J. W. Morris (Associate Professor) & Sungho Jin (Assistant Research Engineer, Member of Research Staff)

Authors
  1. Chol K. Syn
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  2. J. W. Morris
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  3. Sungho Jin
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Syn, C.K., Morris, J.W. & Jin, S. Cryogenic fracture toughness of 9Ni steel enhanced through grain refinement. Metall Trans A 7, 1827–1832 (1976). https://doi.org/10.1007/BF02659812

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  • DOI: https://doi.org/10.1007/BF02659812

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