Transactions, Band 64Some vols., 1920-1949, contain collections of papers according to subject. |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
½ hr aging alloy containing alloys aluminum amalgam amount annealed average brass briquets brittle bronze Bureau of Standards calcines carbon cast cent Chem coke colloidal composition concentrates condenser constantan constituent cooling copper crystalline crystals CuAl CuAl2 curve diameter distillation ductility duralumin effect electrical electrolytic Elongation etching eutectic extensometer FeAl furnace hard-rolled strip hardening hearth Heat treated heat treatment Horse Head impurities increase ingots intercrystalline International Nickel Co iron lead magnesium manganese manganin material maximum melting point metal mold nickel wire nitric acid obtained originally annealed oxide particles Plate plugs produced pure reannealing recrystallization reduced resistance retort roaster roasting rolled zinc samples Scleroscope Hardness sheet shown in Fig shows silicon Soft-rolled solid solution solubility specimens spelter steel strip zinc structure sulfate sulfide sulfur surface TABLE temperature tensile strength terminals test bars thermal tion ture U. S. Bureau values zinc sulfate
Beliebte Passagen
Seite 289 - It is composed of 88 per cent copper, 10 per cent tin and 2 per cent zinc.
Seite 243 - ... no signs of any one having anything to do. This may be accounted for to a certain extent by the fact that 300 houses are occupied by those useless, unprofitable drones termed Syuds.* The place has no manufactures, except of carpets of an inferior quality to those of Birjund ; but there is a description of silk embroidery made by the women, which, if not very pretty, is unique, not being made elsewhere...
Seite 67 - Annealed at 300°, 1 7 ; quenched, but not aged, 16; quenched and aged 8 days, 35. This is probably due to the fact that a specimen as ordinarily cooled after annealing still contains some dissolved CuAl2 in excess of its solubility ; the material hardens slightly during cooling. Specimens cooled extremely slowly give a scleroscope hardness of from 7 to 10, much lower than that of the quenched imaged ones.
Seite 510 - Yield point (pounds per square inch) Tensile strength (pounds per square inch) Elongation (per cent in 8 inches) Reduction of area (per cent) Test No.
Seite 223 - Service shall be made of a bronze casing with the bore tapering continuously and evenly from end to end, and filled from end to end with tin not less than...
Seite 20 - CuAl2 at 525° C. and about 12.5 per cent, of magnesium as Mg4Al3 at 450° C. The solubility of both compounds decreases with decreasing temperature. At 300° C., aluminum dissolves only 1 per cent, of copper as CuAl2 and slightly less than 5.9 per cent, of magnesium as Mg4Al3.
Seite 67 - Hardening of Duralumin and That of Steel The hardening of duralumin upon the basis of this hypothesis presents an interesting analogy with that of steel. The hardening of steel is due to the partial or entire suppression of the eutectoid transformation; most recent thought regards it as due more directly to the suppression of the cementite precipitation (as pearlite) , the transformation of y and a iron having taken place at least in part.
Seite 71 - Quenching is best and most conveniently carried out in boiling water. The mechanical properties are better after quenching in hot than after quenching in cold water, and there is less danger of cracking due to cooling stresses.
Seite 11 - To observe whether 20 hours' annealing was really sufficient to bring about equilibrium within these alloys, specimens of C20 to C25 (and marked H) were annealed 10 days at 400° C and quenched. The results of examination showed that C23-!! contained a small amount of CuAl2, C22-H, none, in exact agreement with observations after 20 hours' annealing at the same temperature.
Seite 62 - NaOH, a dilute solution of hydrofluoric acid, HF, or in a dilute solution of NaOH. The grain structure of the alloy is best developed by the two former solutions; 10 per cent NaOH and 5 per cent HF are generally used for this purpose. For the identification and study of the different microscopic constituents of the alloy a o. i per cent solution of NaOH has, however, shown itself much superior to the former ones, and this solution has been used in most of the authors