Effect of Solid Fraction on Microstructure and Casting Faults of AZ91D Alloys in New Type Semi-Solid Injection Process

Miwa, Kenji; Rachmat, Rudi S.; Tamura, Tomohide

doi:10.4028/3-908451-26-4.441

Cited by 2 publications

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“…Simultaneously the pre-heating temperatures of typical hot-working steel dies must not exceed the annealing temperature of the respective parts, leading to a temperature difference between the semi-solid slurry and the die that is significantly increased compared to light metal thixoextrusion. Owing to this temperature gradient premature freezing of the work material in the recipient/die-system is regularly observed [1]. The most common strategy to overcome this restraint is to increase the ram speed and, hence, extrusion velocity.…”

Section: Introductionmentioning

confidence: 99%

Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies

Muenstermann

Telle

Knauf

2008

SSP

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Isothermal semi-solid extrusion experiments using steel grade X210CrW12 as work material were performed on an industrial forging machine. An improved and up-scaled tool design was applied, based on the concept of self-heating ceramic dies tested in previous laboratory-scale studies and allowing for die preheating temperatures of up to 1400°C. Steel rods of complex cross sectional geometry were formed at low extrusion forces. Shape accuracy of as-formed rods is accurate and metallurgical examination yields no evidence of liquid phase separation. With a view on the intended industrial implementation construction of ceramic tools has to be improved in order to avoid rupture of ceramic parts due to thermo-mechanically induced stresses and to benefit from the advantages inherent to ceramics in metal forming.

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Section: Introductionmentioning

confidence: 99%

Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies

Muenstermann

Telle

Knauf

2008

SSP

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“…In semisolid rolling processes, Kiuchi and Sugiyama 7) reported the semisolid rolling of cast irons, Yoshida et al 8) clarified the advantages of strip rheocasting (SRC) stainless steel, and Kang et al, 9) studied the direct rolling of semisolid-steel (0.6 (mass%)C and 1Cr18Ni9Ti) slurry. In semisolid extrusion processes, Secordel et al 10) carried out experimental extrusion tests to study the rheological behavior of semisolid steels (100C6 and Z85WDCV6542), Miwa and Kawamura 11) published information on the semisolid extrusion forming of stainless steel, Abdelfattah et al 12) and Rouff et al 13) extruded 0.8 (mass%)C steel-based material in a semisolid temperature range, and Robelet et al 14) reported direct extrusion test results of C38 and C80 steels.…”

Section: Introductionmentioning

confidence: 99%

Semisolid Extrusion of Low-Carbon Steel

Sugiyama

Li²,

2007

Mater. Trans.

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The semisolid state behavior and semisolid extrusion properties of low-carbon steel were investigated, focusing on the possibility of clarifying a semisolid-forming process. First, the cooling curve of low-carbon steel is assessed by thermal analysis, so as to clarify the semisolid temperature range. The microstructure of the hot-rolled bar obtained at the semisolid temperature is the globular structure similar to those of aluminum and magnesium alloys. Then, to obtain a better understanding of the semisolid deformation behavior of the material, extrusion tests are carried out at various billet temperatures and cooling conditions at the die exit. To prevent the temperature decrease of the billet, a graphite case and block surrounding the billet acted as an insulator in the extrusion tests. The mechanical properties and the microstructure of the extruded products are evaluated and discussed, i.e., the extrusion force in the semisolid state is less than half that of the hot extrusion. The distribution of chemical components, such as carbon, is measured in the radial direction of the cross section of the products. The roomtemperature hardness of the as-extruded products shows a specific distribution from the surface to the center. The hardness at the center is approximately two times greater than that at the surface.

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Effect of Solid Fraction on Microstructure and Casting Faults of AZ91D Alloys in New Type Semi-Solid Injection Process

Cited by 2 publications

References 0 publications

Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies

Semi-Solid Extrusion of Complex-Shaped Steel Rods Using Ceramic Dies

Semisolid Extrusion of Low-Carbon Steel

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