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Grain refinement through thermal cycling in an Fe-Ni-Ti cryogenic alloy

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Abstract

A thermal cycling technique which allows the grain refinement of Fe-12 Ni-0.25 Ti alloy from 40∼60 µm (ASTM #5∼6) to 0.5 ∼ 2 µm (ASTM #1∼18) in four cycles has been developed. The process consists of alternate annealing in γ range and (α + γ) range with intermediate air cooling. The transformation behavior, the change of microstructures and cryogenic mechanical properties on each cycling step are described. Due to the ultrafine grain size, the ductile-brittle transition temperature of this ferritic alloy in Charpy impact testing was suppressed below 6 K. In fracture toughness testing at 77 K, the mode of fracture was altered from brittle quasi-cleavage to complete ductile rupture through the grain refining.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of California and Center for the Design of Alloys, Inorganic Materials Research Division, Lawrence Berkeley Laboratory, 94720, Berkeley, California

    S. Jin (Assistant Research Engineer), J. W. Morris (Associate Professor) & V. F. Zackay (Professor)

Authors
  1. S. Jin
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  2. J. W. Morris
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  3. V. F. Zackay
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Jin, S., Morris, J.W. & Zackay, V.F. Grain refinement through thermal cycling in an Fe-Ni-Ti cryogenic alloy. Metall Trans A 6, 141–149 (1975). https://doi.org/10.1007/BF02673682

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  • DOI: https://doi.org/10.1007/BF02673682

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