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Journal articles on the topic 'Laves phase (fe2nb)'

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Published: 4 June 2021

Last updated: 7 February 2022

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Takeyama, Masao. "Novel Concept of Austenitic Heat Resistant Steels Strengthened by Intermetallics." Materials Science Forum 539-543 (March 2007): 3012–17. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3012.

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Alloy design concept for the development of a new class of austenitic heat resistant steels strengthened by Fe2M Laves phases (M: transition metals) has been proposed. The phase diagram studies on Fe-Ni-M ternary systems demonstrate that Fe2Nb with C14 structure is the most promising, because more than 40at% Ni can dissolve into the Fe sublattice sites and large γ+Fe2Nb two-phase region exists along the equi-niobium concentration direction. The control of the c/a ratio of the Laves phase using the composition homogeneity region by alloying makes it possible to disperse the Laves phase finely in the γ matrix. Based on the knowledge, a model alloy Fe-20Cr- 30Ni-2Nb (at%) was proposed and the TTP diagram of the Laves phase was constructed. The Laves phase homogeneously nucleates in the matrix and its fine morphology remains almost unchanged even after long-term aging at 1073K.

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Takata, N., H. Ghassemi-Armaki, Y. Terada, M. Takeyama, and S. Kumar. "Effect of Dislocation Sources on Slip in Fe2Nb Laves Phase with Ni in Solution." MRS Proceedings 1516 (2012): 269–74. http://dx.doi.org/10.1557/opl.2012.1566.

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ABSTRACTWe have examined the compression response of a ternary Fe2Nb Laves phase by deforming micropillars with a diameter of ~2 μm produced by focused ion beam milling from a two-phase Fe-15Nb-40Ni (at.%) ternary alloy consisting of the Laves phase and γ-Fe. The Laves phase micropillars exhibit high strength of about 6 GPa (of the order of the theoretical shear strength of the material), followed by a burst of plastic strain and shear failure on the basal plane. If dislocation sources are introduced on a non-basal plane in the micropillars by nanoindentation prior to compression, yielding occurs at a significantly lower stress level of about 3 GPa and plastic deformation by slip proceeds on a pyramidal plane close to (-1-122). Furthermore, if regenerative dislocation sources for basal slip are present in the micropillar, the Laves phase can be continuously plastically deformed in a stable manner to at least 5% strain at a significantly lower stress of 800 MPa. We thus demonstrate the plastic deformation of this ternary Laves phase at the micron-scale at room temperature when sufficient dislocation sources are present.

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Roy, M. "Synthesis and magnetic properties of Laves phase Fe2Nb amorphous alloy." Applied Physics A 86, no. 2 (November 17, 2006): 177–80. http://dx.doi.org/10.1007/s00339-006-3755-1.

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Ahn, Jae Cheon, Gyu Man Sim, and Kyung Sub Lee. "Effect of Aging Treatment on High Temperature Strength of Nb Added Ferritic Stainless Steels." Materials Science Forum 475-479 (January 2005): 191–94. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.191.

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Effects of aging treatment on high temperature strength of Nb added ferritic stainless steels for automotive parts were investigated. Hot tensile tests were carried out at 700 °C after the aging at 700 °C for different aging times using Gleeble 1500. High temperature strength of all steels decreased as the aging time increased. In Nb free steels, the reduction in high temperature strength is mainly due to grain growth. On the other hand, in Nb added steels, the reduction in high temperature strength occurred by Nb precipitation. It was observed that Fe2Nb (Laves phase), Nb(C,N) and Fe3Nb3C were precipitated out during the aging at 700 °C in Nb added steels. The coarsening rate of Fe2Nb was higher than that of Nb(C,N). Fine Fe2Nb precipitates formed during at the early stage of aging contributed to high temperature strength in 0.01C-0.38Nb steel. However, coarse Fe2Nb particles formed during the aging were very detrimental to high temperature strength. The coarsening of Fe2Nb was relatively retarded by adding Mo.

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Roy, M. "Synthesis and magnetic properties of off stoichiometric Laves phase Fe2Nb amorphous alloy." Solid State Communications 141, no. 12 (March 2007): 649–52. http://dx.doi.org/10.1016/j.ssc.2007.01.017.

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Chen, S. W., C. Zhang, Z. X. Xia, H. Ishikawa, and Z. G. Yang. "Precipitation behavior of Fe2Nb Laves phase on grain boundaries in austenitic heat resistant steels." Materials Science and Engineering: A 616 (October 2014): 183–88. http://dx.doi.org/10.1016/j.msea.2014.07.104.

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Fujita, Nobuhiro, Masao Kikuchi, and Keiichi Ohmura. "Expressions for Solubility Products of Fe3Nb3C carbide and Fe2Nb Laves Phase in Niobium Alloyed Ferritic Stainless Steels." ISIJ International 43, no. 12 (2003): 1999–2006. http://dx.doi.org/10.2355/isijinternational.43.1999.

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Shassere, Benjamin, Yukinori Yamamoto, Jonathan Poplawsky, Wei Guo, and Sudarsanam Suresh Babu. "Heterogeneous Creep Deformations and Correlation to Microstructures in Fe-30Cr-3Al Alloys Strengthened by an Fe2Nb Laves Phase." Metallurgical and Materials Transactions A 48, no. 10 (August 7, 2017): 4598–614. http://dx.doi.org/10.1007/s11661-017-4274-8.

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Zhao, Bing Bing, Xian Ping Dong, Feng Sun, and Lan Ting Zhang. "Impact of L1₂-Ordered Precipitation on the Strength of Alumina-Forming Austenitic Heat-Resistant Steels." Materials Science Forum 941 (December 2018): 692–97. http://dx.doi.org/10.4028/www.scientific.net/msf.941.692.

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Alumina-forming austenitic (AFA) heat-resistance steels firstly developed by Yamamoto et al. at Oak Ridge National Laboratory have been reported as a new promising class of steels with potential for use in high temperature applications in recent years. The creep resistance of AFA steels is improved mainly by precipitation strengthening. Besides modifying the typical existing precipitates, i.e. MC and M23C6 type carbides, B2-NiAl and Fe2Nb-type Laves phase, introduction of coherent L12-ordered precipitate is highly desired. L12-ordered phase gamma prime (γ’) is the most important precipitate for high-temperature strengthening in Ni-based superalloys. In the present work, we demonstrate that addition of 2.8 wt. % Cu to an AFA steel promotes the formation of an L12-ordered phase with the dominating elements Ni, Cu and Al. TEM characterization after slow rate tensile tests indicated there were the different precipitation behaviours at 700°C and 750°C. It was revealed that the occurrence of L12-ordered Ni-Cu-Al phase depends on temperature and Ni content. This opens up new opportunities to promote the formation of L12-ordered phase in Fe-based austenitic heat-resistance steels and benefit high-temperature mechanical properties.

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Takata, Naoki, Hassan Ghassemi-Armaki, Masao Takeyama, and Sharvan Kumar. "Nanoindentation study on solid solution softening of Fe-rich Fe2Nb Laves phase by Ni in Fe–Nb–Ni ternary alloys." Intermetallics 70 (March 2016): 7–16. http://dx.doi.org/10.1016/j.intermet.2015.11.003.

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Misosaku, Yu, Imanuel Tarigan, Takahiro Kimura, Naoki Takata, Mitsutoshi Ueda, Toshio Maruyama, and Masao Takeyama. "Effect of Grain Boundary Fe2Nb Laves Phase on Creep of Austenitic Heat Resistant Steel of Fe-20Cr-30Ni-2Nb in Steam Atmosphere." Tetsu-to-Hagane 100, no. 9 (2014): 1158–64. http://dx.doi.org/10.2355/tetsutohagane.100.1158.

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Tewes, M., J. Zweck, and H. Hoffmann. "Short-range order in amorphous FeTb." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 120–21. http://dx.doi.org/10.1017/s042482010017373x.

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The importance of amorphous rare-earth/transition-metal (Re-TM) alloys for use as magneto-optic (MO) storage media has been shown first in 1973. First atomic structural data of amorphous Fe2Tb were given in 1974 and compared with those of a crystalline counterpart, which is the well-known Laves phase. Significant differences of short range order (sro) in amorphous and crystalline Fe2Tb have been found. Similiar results were given in 1986 for a composition Fe79Tb21, to be used for MO-recording.In this work we present pair distribution functions (PDF’s) determined from electron diffraction data for amorphous FeTb alloys. It has been shown that Fourier transformation of the experimental observed diffraction intensities gives the original infinite lattice of an investigated (crystalline) specimen multiplied by its selfcorrelation-function. Therefore the PDF approaches zero for r-values greater than the distance ro representing the mean dimension of a crystal.

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Eremin, Evgeniy N., Alexsander S. Losev, and Sergey A. Borodikhin. "Heat Resistance of Steel N8G6M3FTB Obtained by Surfacing Cored Wire." Defect and Diffusion Forum 410 (August 17, 2021): 507–12. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.507.

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The operational reliability of rolling production tools depends on the heat resistance of the steel from which they are made. To increase the performance of the rolls, a hardening surfacing with wear-resistant alloys is used. The effectiveness of the applied hardening technology depends on the functional characteristics of the deposited metal. The aim of the work is to study the tempering resistance in the state after heat treatment of the deposited steel (Fe-C-Ni-Mn-Mo-V-Ti-Nb system). It was established that the thermal resistance coefficient of steel 15N8G6M3FTB at temperatures from 650 to 800 °C varies from 0.76 to 0.66, which exceeds the heat resistance of steel 30Kh2V8F by 1.5 times. It is shown that in the fine structure of such a metal after tempering at 800 °C, large amounts of finely dispersed precipitates are observed. These precipitates have a rounded shape up to 100 nm in size and belong to the Laves phases - Fe2Mo, Fe2Nb, and Fe2Ti. The obtained high heat resistance values of 15N8G6M3FTB steel make it possible to recommend it for creating surfacing materials. Flux-cored wire based on this steel can be used for hardfacing hardening of tools operating at temperatures up to 800 °C inclusive.

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Hasebe, Y., K. Hashimoto, T. Matsuo, and M. Takeyama. "Assessment of the Phase Equilibria among γ-Fe/ Fe2Nb/ Ni3Nb Phases in Fe-Ni-Nb Ternary System at Elevated Temperatures." MRS Proceedings 1295 (2011). http://dx.doi.org/10.1557/opl.2011.557.

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ABSTRACTPhase equilibria among γ-Fe, ε-Fe2Nb Laves and δ-Ni3Nb phases in Fe-Ni-Nb ternary system at 1473 K and 1373 K were experimentally examined, and also assessed by calculation in order to calculate the phase equilibria among these phases at 973 K. A ternary compound with hP24 structure with its limited composition range of Fe-21.5Nb- (56.8-59.8) Ni exists between Fe2Nb and Ni3Nb phase regions at both temperatures. Including the hP24 phase, the calculated isotherms at both temperatures are in good agreement with experimental ones. By using the optimized interaction parameters among the three elements in each phase, the isothermal section calculated at 973 K revealed a γ-Fe+ Fe2Nb + Ni3Nb three-phase coexisting region extended to Fe-rich composition of 80 at. % Fe. This suggests a possibility to develop austenitic heatresistant steels strengthened by both intermetallics phases.

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Takata, Naoki, Shigehiro Ishikawa, Takashi Matsuo, and Masao Takeyama. "Transmission Electron Microscopy of Fe2Nb Laves Phase with C14 structure in Fe-Nb-Ni Alloys." MRS Proceedings 1128 (2008). http://dx.doi.org/10.1557/proc-1128-u08-06.

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AbstractThe lattice structure of the C14 Fe2Nb Laves phase with Ni in solution in Fe-Nb-Ni ternary alloys was examined by transmission electron microscopy. Binary stoichiometric Fe2Nb (Fe-33.3 at.% Nb) exhibits a featureless morphology with a low dislocation density. A similar morphology was observed in stoichiometric Fe2Nb containing 20 at.% Ni and in binary Fe-rich Fe2Nb (Fe-27.5 at.% Nb). In contrast, many planar faults parallel to the basal plane of the C14 structure were observed in Fe-rich Fe2Nb with Ni in solution, and the fault density increases with increasing Ni content up to 33.1 at.%. The high resolution transmission electron microscope (HRTEM) analysis revealed that the planar faults are related to the local change in the stacking sequence of the three 36-nets (triple layer) of the C14 structure. These results suggest that the presence of both, the point defects (Fe sublattice sites occupied by Ni atoms) and the anti-site defects (Nb sublattice sites occupied by excess Fe atoms), facilitate the formation of the planar faults.

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Ishikawa, Shigehiro, Takashi Matsuo, Naoki Takata, and Masao Takeyama. "Site Occupation and Defect Structure of Fe2Nb Laves Phase in Fe-Nb-M Ternary Systems at Elevated Temperatures." MRS Proceedings 1128 (2008). http://dx.doi.org/10.1557/proc-1128-u08-04.

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AbstractFor the Fe2Nb Laves phase with C14 structure in the Fe-Nb-M (M : Cr, Mn, Co, Ni) systems, the site occupation of M in Fe2Nb has been examined in terms of XRD Rietveld analysis, particularly paying attention to the two Fe sublattice sites of Fe1 (36-net in the triple layer : t) and Fe2 (kagome-net of the single layer : s) with the fraction of 0.25 and 0.75, respectively. In any these four ternary systems, the Fe2Nb Laves phase region largely extends along the equi-Nb concentration direction; for Mn complete solid solubility exists, and the solubility of Cr and Co in Fe2Nb is more than 50 at.% and that of Ni is 44 at.%. Thus, at least two thirds of all Fe sublattices in Fe2Nb are occupied by M in all cases. Rietveld analysis revealed that Cr and Mn with which have a larger atomic size than Fe prefer to occupy the Fe1 sublattice site when the amount in solution is less than 0.25 fraction of Fe in Fe2Nb and the preferred occupation site changes to the Fe2 sublattice site when the amount in solution increases beyond 0.25. In contrast, Co and Ni whose atomic size is smaller than Fe preferentially occupy the Fe2 sublattice site, regardless of the amount. The c/a ratio of stoichiometoric Fe2Nb increases and becomes closer to the ideal value (1.633) of the cubic C15 structure when the Fe1 sublattice site is occupied by Cr and Mn. However, the degree of symmetries of both tetrahedron and kagome-net formed by Fe atoms become better when Fe2 sublattice site is occupied by a certain amount of Ni.

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Roy, M. "WITHDRAWN: Synthesis and magnetic properties of Laves phase Fe2Nb amorphous alloy." Solid State Communications, November 2006. http://dx.doi.org/10.1016/j.ssc.2006.10.027.

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Tarigan, Imanuel, Keiichi Kurata, Naoki Takata, Takashi Matsuo, and Masao Takeyama. "Novel Concept of Creep Strengthening Mechanism using Grain Boundary Fe2Nb Laves Phase in Austenitic Heat Resistant Steel." MRS Proceedings 1295 (2011). http://dx.doi.org/10.1557/opl.2011.558.

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ABSTRACTThe creep behavior of a new type of austenitic heat-resistant steel Fe-20Cr-30Ni-2Nb (at.%), strengthened by intermetallic Fe2Nb Laves phase, has been examined. Particular attention has been given to the role of grain boundary Laves phase in the strengthening mechanism during long-term creep. The creep resistance increases with increasing area fraction (ρ) of grain boundary Laves phase according to equation ε/ε = (1−ρ), where ε0 is the creep rate at ρ = 0. In addition, the creep rupture life is also extended with increasing ρ without ductility loss, which can yield up to 77% of elongation even at ρ = 89%. Microstructure analysis revealed local deformation and well-developed subgrains formation near the grain boundary free from precipitates, while dislocation pile-ups were observed near the grain boundary Laves phase. Thus, the grain boundary Laves phase is effective in suppressing the local deformation by preventing dislocation motion, and thereby increases the long-term creep rupture strength. This novel creep strengthening mechanism was proposed as “grain boundary precipitation strengthening mechanism” (GBPS).

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Takeyama, Masao, Nobuyuki Gomi, Sumio Morita, and Takashi Matsuo. "Phase Equilibria and Lattice Parameters of Fe2Nb Laves Phase in Fe-Ni-Nb Ternary System at Elevated Temperatures." MRS Proceedings 842 (2004). http://dx.doi.org/10.1557/proc-842-s5.37.

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ABSTRACTPhase equilibria in Fe-Ni-Nb ternary system at elevated temperatures have been examined, in order to identify the two-phase region of γ-Fe (austenite) and ε-Fe2Nb (C14). The ε single phase region exists in the range of 27.5 to 35.5 at.% Nb in the Fe-Nb binary system, and it extends toward the equi-niobium concentration direction up to 44 at.% Ni in the ternary system at 1473 K, indicating that more than half of the Fe atoms in Fe2Nb can be replaced with Ni. Thus, the γ+ε two-phase region exists extensively, and the solubility of Nb in γ phase increases from 1.5 to 6.0 at.% with increase in Ni content. The lattice parameters of a and c in the C14 Laves phase decrease with increasing Ni content. The change in a axis is in good agreement with calculation based on Vegard's law, whereas that of c axis is much larger than the calculated value. The result suggests that atomic size effect is responsible for a-axis change and the binding energy is dominant factor for the c-axis change. To extend these findings to development of new class of austenitic steels strengthened by Laves phase, an attempt has been made to control the c/a ratio by alloying. The addition of Cr is effective to make the c/a ratio close to the cubic symmetry value (1.633).

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