Cryogenic Toughness Through Microstructure Control in an Iron-Nickel-Titanium Alloy

S Jin; B Whitaker; JW Morris; VF Zackay

doi:10.1520/STP29168S

SYMPOSIA PAPER Published: 01 January 1975

STP29168S

Cryogenic Toughness Through Microstructure Control in an Iron-Nickel-Titanium Alloy

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This paper discusses the selection of composition and processing of an iron-nickel-titanium (Fe-Ni-Ti) alloy having a favorable combination of strength and toughness at cryogenic temperatures. Criteria on alloy composition lead to the choice of low interstitial Fe-12Ni-0.25Ti. The alloy has a naturally favorable microstructure, but cryogenic toughness must be imparted through grain refinement. Several alternate procedures are identified; four of these are discussed in detail, along with the resulting tensile properties at 77 K, Charpy impact energies at 77 and 5 K, and behavior in fracture toughness tests at 77 K. Alloys are obtained having yield strengths to 150 ksi with excellent impact toughness to 5K.

Author Information

Jin, S

University of California, Berkeley, Calif.

Whitaker, B

University of California, Berkeley, Calif.

Morris, JW

University of California, Berkeley, Calif.

Zackay, VF

University of California, Berkeley, Calif.

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Details

Developed by Committee: E50

Pages: 348–360

DOI: 10.1520/STP29168S

ISBN-EB: 978-0-8031-4659-4

ISBN-13: 978-0-8031-0538-6

Cryogenic Toughness Through Microstructure Control in an Iron-Nickel-Titanium Alloy

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