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Dies Damage in long Term Die Casting of Aluminum Alloys.
No full textEd. Inst. Metallkunde und Werkstoffprufun
Corrosion resistance of cerium-based chemical conversion coatings on AA5083 aluminum alloy
No full textIn this paper the effect of several parameters, such as temperature, time of immersion, cerium ions and hydrogen peroxide concentration, pH of the conversion solution, on the composition and morphology of the conversion layer are investigated as well as on its corrosion resistance in chloride environments. The cerium-based chemical conversion coatings ennobles the corrosion potential and inhibits both the cathodic and anodic reactions rate. Using a cerium (III) chloride solution a not homogeneous coating is obtained and agglomerates with a “dry-mud” morphology of mixed cerium-aluminium oxide are deposited above the cathodic intermetallic particles, while using a cerium (III) nitrate solution the coating is more uniform but thinner than that obtained with cerium (III) chloride. Solution temperature below 50°C and time of immersion of 10 minutes produces a coating with better corrosion resistance
Investigation of secondary phases effect on 2205 DSS fracture toughness.
No full textThe fracture toughness properties of duplex stainless steels (DSS) are strongly reduced by intermetallic phases, precipitating at 600-1000°C. In this investigation, the embrittlement effect induced by a low content of these phases has been studied in a 2205 DSS, by means of instrumented Charpy V impact testing. Different contents of intermetallic phases have been produced by isothermal treatments at 800-950°C. The microstructure has been analysed by scanning electron microscope/backscattered electron images. The impact test results, the examination of the fracture surfaces and of the cross-sections close to the notch root allows us to elucidate the role of secondary phases contents in reducing impact fracture toughness. When the quantity of secondary phases is 1%, the fracture is completely brittle. The plastic deformation at the notch root and in the resisting section provokes a secondary phase breakage with a high density microcrack formation, inducing an easy nucleation and propagation of the final fracture crack. When the content of secondary phases is between 0·5 and 1%, fracture is mixed. Both the sigma σ and chi χ phases have been found to be responsible for the embrittling of the 2205 DSS, and fracture toughness mainly depends on their density and dimension
Gas atomization of nickel aluminide powders.
No full textInstitute of Materials, 1 Carlton House Terrace, London, U.K., ISSN 0032-589
Different metallurgical methods for measuring secondary phases precipitation in duplex stainless steels
No full textIron age metallurgy: a preliminary study of slags from Tell Shiukh Fawqani (Nothern Syria)
No full textTrattamenti di ricottura dell'acciaio inossidabile duplex 2205 dopo deformazione plastica | [Effect of heat treatment after cold rolling deformation of duplex stainless steels SAF 2205]
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