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Effect of chromium on low-temperature deformation of high-purity ironA series of very low interstitial Fe-Cr alloys containing 0, 1, 3, 5, and 10 wt% Cr were prepared by vacuum melting and fabricated under argon to 1.83 mm diam wires exposed in an alumina system to wet hydrogen for 200 h at 1423 K followed by 1000 h in ZrH2-purified hydrogen at 1573 K. The wires were then transverse-rolled into thin sheet and cut into tensile specimens subjected to electropolishing and strained to fracture in a series of cryogenic baths ranging from 4.2 K to room temperature. It is shown that small Cr additions lower the twinning stress so that yielding occurs by twinning rather than by slip. Cr in amounts up to 10 wt% has little effect on the yield strength of high-purity Fe between 147 and 300 K, and ductility is not greatly affected at any test temperature. Higher solute contents provide appreciable strengthening only at temperatures of 112 K and below.
Document ID
19760048558
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kelley, M. J.
(DuPont de Nemours Engineering Technology Laboratory Wilmington, Del., United States)
Stoloff, N. S.
(Rensselaer Polytechnic Institute, Troy, N.Y., United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1976
Publication Information
Publication: Metallurgical Transcations A - Physical Metallurgy and Materials Science
Volume: 7A
Subject Category
Metallic Materials
Accession Number
76A31524
Funding Number(s)
CONTRACT_GRANT: NGL-33-018-003
Distribution Limits
Public
Copyright
Other

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