bct-Fe formation during mechanical processing of bcc-Fe powder

Journal Article · Mon May 01 00:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00164-Q· OSTI ID:64351

Rawers, J; Govier, D ^[1]; Cook, D ^[2]

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1. Bureau of Mines Albany Research Center, Albany, OR (United States)
2. Old Dominion Univ., Norfolk, VA (United States)

In this study, a novel technique for producing nanocrystalline bct-Fe from bcc-Fe is reported. bct-Fe, often referred to as martensite, is normally produced either by a thermal transformation or through a shear stress mechanism from retained fcc-Fe. The authors produced nanocrystalline bct-iron-carbon/nitrogen phase by processing bcc-Fe powder in high-energy ball mill. bct-Fe formed after a significant amount of mechanical processing (cold working) in the presence of interstitial atoms of either carbon or nitrogen, bct-(Fe-C/N). The authors hesitate to call the bct-Fe phase observed in this study martensite because martensite is normally though to form from fcc-Fe and from planar lattice shifts resulting in a relationship in the martensite lattice orientation and the bcc/fcc lattice in which it is embedded. No such relationship between the bct formed in this study and the bcc matrix was observed. The capability of producing nanocrystalline bct powder offers the possibility of producing near-net-shape, high strength products.

• OSTI ID: 64351
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 9 Vol. 32; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARGON
CARBON
CRYSTAL-PHASE TRANSFORMATIONS
GRINDING
IRON
MARTENSITE
METALLURGICAL EFFECTS
NITROGEN
STAINLESS STEELS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION