Fe-based alloys

Zinc dialkyldithiophosphates (ZDDPs), which act as antiwear additives in lubricating oils and were postulated to exist in various molecular forms (monomer, dimer or neutral form, and basic form), were studied by multi-edge (Zn K-, P K- and S K-) XAS for structural assessment [311]. Grazing incidence absorption spectroscopy measurements have provided evidence for breakdown of the ZDDP molecule following its adsorption on to a steel substrate surface [312]. XANES and CEMS were used to study the interaction of per-fluoropolyalkyl ether (PFPAE) additives with Fe-based alloys [313],... 

Iron (Fe), 74 490-529. See also Fe entries Ferr- entries Iron compounds Ironmaking processes Manganese ferroalloys MoFe protein Nickel-chromium—iron alloys Nickel—iron-aluminum catalyst Ni-Fe-base alloys VFe protein... 

NifA proteins, 27 310-311 Ni-Fe-base alloys, precipitation hardened, 13 520... 

Table 2 Effect of thermal H2 charging on tensile properties of the Fe based-alloys...

Table 2 gives the tensile properties of the alloys. Nano-/ strengthened Fe-based alloys 75 and 90 and 100 have the excellent combination of hydrogen resistance, high strength at room temperature, high temperature strength. The properties of Fe-based alloys are better than that of the commercial Ni-based alloys. 

A total of four Co and Fe based alloys were procured from a commercial source. Disks were punched from the foil and mounted into VCR vacuum fittings, with a nickel gasket on one surface and the sample in direct contact with the VCR sealing surface on the other. The sample assemblies were leak tested and verified leak tight to 2x10 7 sscm He prior to intallation in the permeation test apparatus. 

Alternative Cp models. Chuang et al. (1985) have developed alternative exponential fimctions to describe the Cp curves and applied this to various Fe-base alloys (Chuang et al. 1986)... 

Chandrasekaran, L. and Miodownik, A. P. (1989) Phase equilibria relevant to liquid phase sintering in Fe-base alloys . Report to SERC under contract GR/D 99935 (University of Surrey, Guildford, January). 

Saunders, N. and Sundman, B. (1996) Fe-DATA, a database for calculation of phase equilibria in Fe-based alloys. 

To reach the remanent magnetization values quoted here, the soft layer spontaneous magnetization must be higher than typically 1.6 T. Such values imply that the soft layer be a Fe based alloy. The important adjustable parameter to be considered is the layer thickness, dsoft. Based on the relation established by Skomski and Coey [80], the dsoft dependence of hn = is... 

Pure bulk iron in the fee crystal structure (7-Fe) only exists at very high temperatures (between 1183 and 1667K). However, 7-Fe may be stabilized at low temperatures as small coherent precipitates in copper or copper-alloy matrices or as thin epitaxial films on a Cu or Cu-based alloy substrate [113], (114). Recently the interest in 7-Fe has been revived due to the existence of multiple magnetic states revealed by band-structure calculations [115], which is believed to be related to INVAR phenomena in 7-Fe-based alloys [116]. 

Investigate the nitriding characteristics of existing commercial high-Cr-, Ni- and Fe- base alloys to determine if a similar corrosion resistant Cr-nitride layer can be formed in order to facilitate scale-up and transfer of this technology. 

Fe-base alloys with high Cr-content are summarized as stainless steel. 

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