Showing papers on "Directional solidification published in 1970"
TL;DR: A new precision casting technique based on directional solidification, which imparts significantly improved ductility and thermal shock resistance to high temperature creep resistant, nickel-base superalloys, has been carried through from research to production.
274 citations
TL;DR: The strength of the Ag-Cu eutectic was measured by tension testing for two different types of structure over a range of sizes, temperatures, and strain rates as discussed by the authors.
69 citations
TL;DR: In this paper, electron microscopy was used to determine the dependence of interphase spacing λ on growth rate v and showed that the dependence is consistent with the relation λαμ −1 2 predicted by theory.
60 citations
TL;DR: In this article, the magnetic deformation transforms the cobalt from fcc to hcp and the coercive force increases with increasing growth rate, reaching 330 Oe at 2.1×10−1 cm/sec.
Abstract: Directional solidification of Au–Co eutectic produces an aligned array of fcc cobalt rods in a gold matrix. The cobalt becomes finer, but more lamellar, as growth rate increases. Intrinsic coercive force increases with increasing growth rate, reaching 330 Oe at 2.1×10−1 cm/sec. Coercive forces up to 925 Oe are produced by subsequent wire drawing. Analysis of the magnetization curves indicates that deformation transforms the cobalt from fcc to hcp.
28 citations
TL;DR: A fibrous eutectic with Co fibres embedded in a Au-matrix can be obtained at G/v ≥ 2×105 deg/cm2 whereG = temperature gradient andv = growth velocity as mentioned in this paper.
Abstract: A fibrous eutectic with Co fibres embedded in a Au-matrix can be obtained at G/v ≥ 2×105 deg/cm2 whereG = temperature gradient andv = growth velocity. Interfibre spacing 2R can be described byR2v=1.2×10−11 cm3/sec. Below G/v=2×105 deg/cm2 cellular growth is observed. Fibre to blade transitions have been found over the entire range of growth velocities employed, i.e. between 10−5 and 10−2cm/sec and are thought to be due to local growth perturbations. Composite growth under the influence of a magnetic field produces two effects: an orienting effect and a shape and size modification. Orienting occurs at slow growth rates, preferably, in hypereutectic alloys and is explained as a magnetic aligning of the ferromagnetic primary Co-precipitates. The shape and size modification which results in thick and segmented, caterpillar-like Co fibres, appears to be independent of growth rate (within the limits indicated above), occurs mainly in cell boundaries at all compositions, including hypoeutectic ones, and is thought to be due to a field induced enhancement of local temperature gradients.
18 citations
Patent•
23 Jan 1970
TL;DR: In this article, a vacuum melting and casting apparatus for directional solidification of metallurgical castings is described, which employs a single traveling melting chamber and a plurality of molding chambers.
Abstract: A vacuum melting and casting apparatus for directional solidification of metallurgical castings which employs a single traveling melting chamber and a plurality of molding chambers. By successively coupling the melting chamber with one of the mold chambers at a time, the cast components may be melted and poured under vacuum and thereafter cooled in mold chambers under isolated vacuum conditions so that the melting equipment is not retained in an inactive status during the relatively long directional solidification cycle.
11 citations
01 Feb 1970
2 citations
TL;DR: In this paper, a new process for the preparation of surface layers of high wear resistance is described, and its effectiveness is demonstrated, and a high resistance to rupture under the action of friction is achieved by producing in the surface layer ordered fibrous structures containing hardening phases.
Abstract: 1.
A description is given of a new process for the preparation of surface layers of high wear resistance, and its effectiveness is demonstrated.
2.
A high resistance to rupture under the action of friction is achieved by producing in the surface layer ordered fibrous structures containing hardening phases. This is achieved by heating the surface of coated parts to incipient melting temperatures and cooling the parts with directional heat removal.
1 citations