Thixoforging and Rheoforging of Steel and Aluminium Alloys

Baadjou, René; Knauf, Frederik; Seidl, Ingold; Shimahara, Hideki; Abel, Dirk; Kopp, Reiner; Gasper, Rainer; Schönbohm, Alexander

doi:10.1002/9783527623969.ch10

Cited by 6 publications

(10 citation statements)

References 21 publications

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“…Then, heat transfers by thermal conduction across the die up to the centre of the billet (assuming perfect thermal interface between the die and the billet). Placing the billet into the die avoids the convective and radiation heat losses obtained when the billet is directly heated by induction as Hirt et al (2009b) had shown.…”

Section: Reheating By Inductionmentioning

confidence: 99%

“…In the course of the filling, the flow front surface area increases with increasing diameter of the cup. Such an increase is easily accommodated by the liquid phase which is much more fluid whereas the solid particles could interfere with each other and slow down in their movement (Hirt et al, 2009b). This segregation phenomenon remains small because of the small amount of liquid.…”

Section: Thixoextrusion Test: Load and Induced Microstructurementioning

confidence: 99%

“…Using a protective gas leads to large grains on the side of the slug revealing a lack of recrystallisation because it raises the heat losses. In order to reduce heat losses, Hirt et al (2009b) optimised the coil geometry to increase the energy at the edges. In any case, most of thixoforming experiments are carried out with dies at much lower temperatures than the initial slug.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and flow behaviour during backward extrusion of semi-solid 7075 aluminium alloy

Neag

Favier

Bigot

et al. 2012

Journal of Materials Processing Technology

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The microstructure and flow behaviour during thixo backward extrusion of 7075 aluminium alloy were investigated. Reheating the steel die and the aluminium billet placed into the die at the same time using an induction furnace provides rapidly a very homogeneous microstructure suitable for thixoforming. During thixoextrusion, despite the high solid fraction, the solid globules are weakly connected and slide over each other without any plastic deformation. The flow remains quasi homogeneous resulting in homogeneous induced microstructure of the component.

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Section: Reheating By Inductionmentioning

confidence: 99%

Section: Thixoextrusion Test: Load and Induced Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and flow behaviour during backward extrusion of semi-solid 7075 aluminium alloy

Neag

Favier

Bigot

et al. 2012

Journal of Materials Processing Technology

View full text Add to dashboard Cite

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“…When the billet is reheated from the solid state in an induction furnace, heat losses caused by convection and radiation at the lateral surface of the slug and by heat conduction at the surface bottom occur. Consequently, a large difference between the core and the edge temperature exists (41,42). The transportation of the billet from the reheating to processing place involves also some temperature gradients (43).…”

Section: Initial Conditionsmentioning

confidence: 99%

Modeling of Semisolid Flow

Favier

2014

Comprehensive Materials Processing

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“…The bacterial plasmid pBR322 obtained from the American Type Culture Collection (Rockville, MD) was propagated in E. coli HBlOl [21] and purified by centrifugation on cesium chloride-ethidium bromide density gradients essentially as described previously [22]. Low molecular weight DNA from fibroblasts was isolated by the method described by Hirt [23], except that the cell lysate was treated with 100 pglml of proteinase K, as described previously [24]. Total genomic DNA was isolated essentially as described by Wigler et al [25].…”

Section: Isolation Of Dnamentioning

confidence: 99%

Augmented nuclease activity during cellular senescence in vitro

Dayton

Nahreini

Srivastava

1989

J of Cellular Biochemistry

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The molecular correlates of the limited proliferative potential of normal human diploid fibroblasts and extensive single-strand breaks in the genomic DNA of these cells were examined by transfection analyses in which DNA replication could be uncoupled from DNA damage and repair. Both supercoiled (fmI), and restriction endonuclease-cleaved, linear (fmIII) molecules of a well-defined bacterial plasmid DNA, pBR322, were transfected into, and subsequently recovered from, early and late passage fibroblasts. Southern blot analysis revealed that fmI DNA was converted by random nicks into fmII DNA slightly more rapidly in late passage cells compared with cells at early passage. Similarly, fmII and fmIII DNAs also sustained multiple random nicks and no appreciable net religation of free ends of fmIII DNA could be detected at either passage. In addition, the efficiency of in vitro ligation of fmIII DNA recovered from late passage cells was also reduced, compared with that from early passage cells, as determined by Southern blotting. These data suggest that in the absence of DNA replication, a putative nuclease activity may contribute to DNA damage observed in senescent cells, which, in turn, may be causally related to their limited replicative potential.

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Thixoforging and Rheoforging of Steel and Aluminium Alloys

Cited by 6 publications

References 21 publications

Microstructure and flow behaviour during backward extrusion of semi-solid 7075 aluminium alloy

Microstructure and flow behaviour during backward extrusion of semi-solid 7075 aluminium alloy

Modeling of Semisolid Flow

Augmented nuclease activity during cellular senescence in vitro

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