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Wednesday, October 7, 2020 | History

2 edition of Low-chromium heat-resisting ferritic alloys strengthened by the chi phase found in the catalog.

Low-chromium heat-resisting ferritic alloys strengthened by the chi phase

M. L. Glenn

Low-chromium heat-resisting ferritic alloys strengthened by the chi phase

by M. L. Glenn

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Published by U.S. Dept. of the Interior, Bureau of Mines in [Washington, D.C.] .
Written in English

    Subjects:
  • Chromium-iron alloys.,
  • Heat resistant alloys.,
  • Precipitation hardening.,
  • Intermetallic compounds.

  • Edition Notes

    Bibliography: p. 16-18.

    Statementby M.L. Glenn and J.S. Dunning.
    SeriesReport of investigations ;, 8860., Report of investigations (United States. Bureau of Mines) ;, 8860.
    ContributionsDunning, J. S.
    Classifications
    LC ClassificationsTN23 .U43 no. 8860, TN799.C5 .U43 no. 8860
    The Physical Object
    Pagination18 p. :
    Number of Pages18
    ID Numbers
    Open LibraryOL2816064M
    LC Control Number83600362

    Ferritic Iron-based Alloys Strengthened by Laves Phase. Authors Dunning-JS Source Proc 2D Int'l Conf on Mech Behavior of Mat Am Soc Metals Boston 8/16 . These alloys are included in ASTM specifications A (Chromium stainless flat products), A (Seamless stainless steel mechanical tubing), A (Ferritic stainless steel tubing for general service) and also in ASME code and AISI and SAE specifications. High-chromium ferritic steels have % Cr and low content of carbon and nitrogen.

    modern computational tools for the study of phase stability, microstructure design, and coarsening dynamics, all of which will permit rapid exploration of new materials for these applications. This approach will be the basis for developing prototype ferritic super alloys having: (1) a steady-state creep rate of approximately s   From a practical standpoint, Ferrite can be considered pure iron at a low temperature. Sigma phase is a nonmagnetic intermetallic phase composed mainly of Iron and chromium which forms in ferritic and austenitic stainless steels during exposure at temperatures of to degrees F ( to C) It causes loss of ductility, toughness and is generally strain intolerant, or brittle at.

    Today, more than 1/2 of the high chromium steels are produced in the AOD Furnace Linnert, Welding Metallurgy AWS, A=Martensitic Alloys B=Semi-Ferritic Castro & Cadenet, Welding Metallurgy of C=Ferritic Stainless and Heat-resisting Steels Cambridge University Press, We will look at these properties in next slide! 6Mo alloy). The austenitic grades have a higher solubility for interstitial elements than the ferritic stainless steels. They are not susceptible to °F (°C) embrit-tlement and do resist the formation of sigma phase. The austenitic grades are generally easier to fabricate than the ferritic .


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Low-chromium heat-resisting ferritic alloys strengthened by the chi phase by M. L. Glenn Download PDF EPUB FB2

Low-chromium heat-resisting ferritic alloys strengthened by the chi phase. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Low-chromium heat-resisting ferritic alloys strengthened by the chi phase Part of this research concentrates on finding low-chromium substitutes for heat-resisting stainless steels for the temperature range deg to deg c.

Ferritic alloys are emphasized that have oxidation resistance provided by chromium contents as low as 10 pct and Cited by: 1. Part of this research concentrates on finding low-chromium substitutes for heat-resisting stainless steels for the temperature range deg to deg c.

Ferritic alloys are emphasized that have oxidation resistance provided by chromium contents as low as 10 pct and stress rupture strength provided by the precipitation of the chi(x)-phase.

Low-chromium heat-resisting ferritic alloys strengthened by the chi phase /Author: M. L.#N# (Max L.) Glenn and J. Dunning. Low chromium Heat resisting Ferritic Alloys Strengthened by the Chi Phase 66 F-ov– A I i I i | T I —2– KEY O-O - A 62F o ° c Z _Aa ° C _A-2– A 58. High chromium ferritic steels 7 W (Fe,Cr) 2 W / Chi WNb0Ti (Fe,Cr,Si) 2 (Nb,W) only Niobium “replaces” W, is incorporated into the Laves phase and refines it.

boosts precipitation kinetics of the Laves phase (Si seems to be incorporated into the (Fe,Cr,Si) 2 (Nb,W) phase only). “forces” an HT-Laves phase with higher T Solvus. Alloy development. Thermodynamic equilibrium calculations were performed, employing the software package Thermocalc ® (database TCFE), for nominal compositions of both the commercial Crofer ® 22 H (22 Cr, 2 W, Nb, Si; Fig.

1a) and the low chromium (18 Cr, 2 W, Nb, Si; Fig. 1a) variant. Because of its brittleness and high Cr-content (resulting in lowered Cr. The amount of strengthening (Fe,Si,Cr) 2 (W,Nb) – Laves phase particles is found to correlate well with the level of W- and Nb-alloying and in contrast to ferritic–martensitic steels, the formed Laves phase particles are highly stable at elevated temperature.

Owing to the high contents of chromium, the model alloys have excellent steam. γ phase is a solid solution (face center cubic structure of lattice parameter: a 0 = nm) of alloying elements (Cr, Co, Mo, W) in nickel.

γ′ phase of regular body center cubic structure L1 2 is present in the form of precipitates and is coherent with the matrix. Lattice parameters are: Ni 3 Al – a 0 = nm, Ni 3 (Al 0,5Ti ) – a 0 = nm. γ′ phase crystals. of these alloys are generally adjusted to prevent the for-mation of ferrite which has a detrimental effect on high-temperature creep-rupture strength.

Long-time expo-sure at high temperatures, e.g., ºF, can result in transformation of ferrite to the sigma phase with signifi-cant loss of toughness at room temperature. Thus, in. Low-chromium heat-resisting ferritic alloys strengthened by the chi phase.

Personal Author: Glenn, M. (Max L.); Dunning, J. S.; "The Bureau of Mines is conducting research on fe-based alloys using si and al additions to reduce the cr required for heat-resisting applications. "The Bureau of Mines is investigating low-chromium alloy.

The Fe 2 AlV-strengthened ferritic alloys show an appreciable flow stress and creep strength up to °C, comparable to those of other iron aluminide based alloys with coherent microstructures. In the present study, the brittle-to-ductile transition temperature (BDTT) of the Fe 76 Al 12 V 12 alloy was investigated in the peak hardness condition by Charpy test.

The creep behaviour of ferritic Fe-Cr alloys which are strengthened on one hand by fine dispersions of NbC and on the other hand by coarse distributions of the intermetallic x phase was reported recently [1], [2]. In the present work the deformation behaviour of single and two-phase ferritic Fe-Ni-Al alloys is.

alloy composition for forming the dispersion-strengthened lath martensite microstructure. SSOL 5 was used as the thermodynamic database. LIQUID (liquid phase), FCC_A1 (austenite phase or MX-type carbonitride), BCC_A2 (ferrite phase), HCP_A3 (Cr 2N nitride), M23C6 (M 23C 6 carbide), and LAVES_C14 (Fe 2W Laves phase) were input as the.

Sigma Phase In ferritic stainless steels this phase is composed of iron and chromium alone. In austenitic stainless alloys, it is much more complex and will include nickel, manganese, silicon, niobium, etc. in addition to iron and chromium.

Sigma phase forms in ferritic and austenitic stainless steels from ferrite, or metastable austenite, during. Ferritic stainless steel contains higher chromium content than the martensitic stainless steel. Normally the chromium content of the ferritic stainless steel ranges from 14 to 27 wt%.

From the Fe–C–Cr diagram sectioned at 18% chromium, shown in Fig it appears that for a low-carbon level, the austenite is not possible to form until a very high temperature, viz °C is attained. Ferritic stainless steels are essentially chromium containing steel alloys with at least % Cr.

They can be grouped based on their chromium content: low chromium ( to %), medium chromium (16 to 19%), and high chromium (greater than 25%). This article provides general information on the metallurgy of ferritic stainless steels.

Higher-alloy ferritic and ferritic/austenitic steels are also included, although they may not suffer an α to γ transformation.

Other than this last group, the common feature about these alloys is that they may all, to a greater or lesser degree, be hardened as a result of passing through the weld thermal cycle and may therefore suffer a.

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the HelpHelp. "The Bureau of Mines is conducting research on fe-based alloys using si and al additions to reduce the cr required for heat-resisting applications.

Part of this research is being done to evaluate alloys containing ()-cr-()ni-()Si-()a. Abstract. Papers are presented on the development of oxidation- and sulfidation-resistant ferritic alloys; the microstructural stability of sulfidation-resistant FeCrAl stainless steels around C; age hardening in Fe-Mn-Al-C austenitic alloys; the oxidation/corrosion behavior of low-Cr Fe-Cr-Ni alloys containing Zr or Nb; the high temperature oxidation/corrosion of iron-based superalloys.The Ni-Cr white irons, which are low-chromium alloys containing 3 to 5% Ni and 1 to 4% Cr with one alloy modification which contains 7 to 11% Cr.

The chromium-molybdenum irons containing 11 to 23% Cr, up to 3% Mo, and often additionally alloyed with nickel or copper.Alloy HR °C (°F) One of the strongest available wrought alloys up to about °C (°F). RA alloy (N) About °C (°F) in open air Uses: retorts, rotary calciners, muffles for brazing, molybdenum and tungsten oxide reduction.

(N) °C (°F) Oxidation resistance High strength.