Modern Developments in Powder Metallurgy: Volume 5: by Gerald I. Friedman, John M. Kazaroff (auth.), Henry H.
By Gerald I. Friedman, John M. Kazaroff (auth.), Henry H. Hausner (eds.)
Aluminum P/M elements may be creation sintered in numerous varieties of furnaces and atmospheres. collection of sintering furnace will depend on monetary concerns and creation charges wanted. Batch furnaces have lowest funding charges and are sufficient for low to medium creation while non-stop furnaces are extra high priced yet offer better creation charges. robust, well-sintered P/M elements will be received in atmos pheres of nitrogen, dissociated ammonia and in vacuum. Atmos phere choice will depend on amenities to be had inside of person crops plus estate necessities. optimum strengths are produced in nitrogen via vacuum and dissociated ammonia. Repro ducible dimensions may be completed with right recognition to com pact density, sintering temperature, dew aspect and surroundings. REFERENCES 1. J. H. Dudas and W. A. Dean, "'llie creation of Precision Aluminum P/M Parts," foreign magazine of Powder Metallurgy, Vol. five, April, 1969. 2. P. F. Mathews, "Effects of Processing Variables at the houses of Sintered Aluminum Compacts,!! overseas magazine of Powder Metallurgy, Vol. four, October, 1968. three. J. H. Dudas and okay. J. Brondyke, "Aluminum P/M elements - Their houses and Performance,!! Technical Paper No. 700141, Society of automobile Engineers, Inc., Pennsylvania Plaza, big apple, long island, 10001. four. okay. R. Van Horn (Editor), Aluminum Vol. I, pp. 26-28, American Society for Metals, Metals Park, Ohio, 1967.
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Extra resources for Modern Developments in Powder Metallurgy: Volume 5: Materials and Properties Proceedings of the 1970 International Powder Metallurgy Conference, sponsored by the Metal Power Industries Federation and the American Powder Metallurgy Institute
EXPERIMENTAL RESULTS AND DISCUSSION Structure Structures of the three materials are compared in Figure 1. The structure of the heat treated dispersion strengthened superalloy consisted of coarse cylindrical grains of irregular cross section elongated in the extrusion direction (Figure 1a). The macrograph in Figure 1b shows the coarse grain structure clearly. The TD Nickel bar had a fine grained fibrous structure (Figure lc). The longest grain dimensions were parallel to the bar length and, by inference, parallel to the major working direction.
BENJAMIN AND R. l. CAIRNS 55 y ' PARTICLES / DISPERSOID PARTICLES FIGURE 3a. Transmission Electron Micrograph of Dispersion Strengthened Superalloy 56 NEW P/M MATERIALS PINNED DISLOCATIONS FIGURE 3b. PARTICLES Transmission Electron Micrograph of Dispersion Strengthened Superalloy J. S. BENJAMIN AND R. l. CAIRNS 57 PINNED DISLOCATIONS THORIA PARTICLES FIGURE 3c. Transmission Electron Micrograph of Stress Relief Annealed TD Nickel 58 NEW P/M MATERIALS Tensile Properties The elevated temperature tensile strength of the dispersion strengthened superalloy clearly shows two strengthening regimes.
281" Min. I. 255" Max . Frequency. CPS 240 237 Min. Frequency, CPS 230 230 TABLE 7 FATIGUE DATA ON FORGED POWDER AND WROUGHT BLADES Characteristic FIGURE 11 COMPRESSOR ROTOR BLADES MADE FROM METAL POWDER PREFORMS Photo No. 9270 Part No. 231817 Part No. 231818 Lot A Forged Powder Blades :'~r~I~~S Max. 6 Min. 4 Ave. S. 7 NEW P/M MATERIALS 46 as compared with conventional wrought blades~ REFERENCES 1. Kortovich, C. S. - "Close Tolerance Forgings From Powder Metallurgy Prefonns"; Air Force Materials Laboratory Technical Report TR-69-1Bl June, 1969.