Verwendung von zinkhaltigem Einsatzmaterial in der Eisengiesserei

TIB Hannover: RO 619(43) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

FATIGUE BEHAVIOR OF PEARLITIC S.G. CAST IRONS AFTER LASER SURFACE HEAT TREATMENTS

The laser transformation hardening does not improve the fatigue resistance of two pearlitic S.G. cast irons, using as surface preparation BN coating, sandblasting or phosphatation. On the treated surface, the initial pearlite is transformed into martensite. In the treated layer, further under the treated surface, a martensitic microstructure with traces of incompletely dissolved cementite can be observed. A bidimensional numerical heat transfer model has been developed for surface transformation determination. This model allows the use of temperature dependent thermophysical properties, spatial energy distribution of the laser beam and convective heat losses. The agreement between the calculated results and the experimental results depends on the value of the ratio [MATH]

FATIGUE BEHAVIOR OF PEARLITIC S.G. CAST IRONS AFTER LASER SURFACE HEAT TREATMENTS

The laser transformation hardening does not improve the fatigue resistance of two pearlitic S.G. cast irons, using as surface preparation BN coating, sandblasting or phosphatation. On the treated surface, the initial pearlite is transformed into martensite. In the treated layer, further under the treated surface, a martensitic microstructure with traces of incompletely dissolved cementite can be observed. A bidimensional numerical heat transfer model has been developed for surface transformation determination. This model allows the use of temperature dependent thermophysical properties, spatial energy distribution of the laser beam and convective heat losses. The agreement between the calculated results and the experimental results depends on the value of the ratio [MATH]

Use of galvanized charge materials in the iron foundry

20.00; Translated from German (Giesserei 1987 v. 74(11) p. 343-347)Available from British Library Document Supply Centre- DSC:9022.06(BISI-Trans--26457)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Selecting cast irons for low temperature use

25.00; Translated from French (Fonderie Fondeur 1984 v. 38 p. 11-22)SIGLEAvailable from British Library Document Supply Centre- DSC:9022.06(BISI--25484)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Corrosion Mechanisms of Steel and Cast Iron by Molten Aluminum

International audienceThe corrosion mechanisms by liquid aluminum of three industrial materials have been studied: unalloyed steel (UAS), and ferritic and modified pearlitic cast irons (FCI and PCI, respectively). The behavior of these materials when in contact with liquid aluminum is different. Aluminum diffuses deep into the UAS and forms intermetallic compounds with iron at the surface and in the steel matrix. At the surface, only Fe2Al5 and FeAl3 are found. In the matrix, FeAl2 also is formed in agreement with the equilibrium Fe-Al diagram. From the matrix to FeAl2, the Al content in the ferrite increases progressively until Al saturation is reached. At this step, black elongated precipitates (Al4C3 and/or graphite) appear. Graphite lamellas present in both FCI and PCI constitute an efficient barrier to the Al diffusion. The high silicon content of the FCI leads to the formation of a phase free from Al and saturated in Si. For the PCI, a thin layer rich in Al and Si, which is formed between the matrix and Fe2Al5, limits the diffusion of atoms. The effects of Cr and P added in the PCI also are discussed