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

1995; Pergamon Press; Volume: 32; Issue: 9 Linguagem: Inglês

10.1016/0956-716x(95)00164-q

1873-2712

J. Rawers, D. Govier, Dianne Cook,

Metal Alloys Wear and Properties

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.