| 1. |
- Berns, H., et al.
(författare)
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A new material for cold forging tools
- 1998
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Ingår i: Computational materials science. - : Elsevier. - 0927-0256 .- 1879-0801. ; 11:3, s. 166-180
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Tidskriftsartikel (refereegranskat)abstract
- A new tool material for cold forging applications was developed using numerical simulation techniques (FEM) for the design and a powder metallurgical route (HIP) for the production. The basic idea was to find an optimized microstructure of the two phase material by simulating different distributions of hard particles within the metal matrix. On the micro-scale, loading was applied by a field of deformations which was obtained by a macroscopical simulation of a particular cold forming process in bolt making. A new double dispersion microstructure was found to show the best resistance against crack propagation. Specimens were produced by hot isostatic pressing. Afterwards the new material was tested in the laboratory. Wear resistance and bending strength of the double dispersive material are comparable to a standard dispersion material with the same volume fraction of particles, but fracture toughness is increased by about 30%. Testing the new material in bolt making showed that the life time of the tool is increased by a factor of 8.
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| 2. |
- Abrikosov, IA, et al.
(författare)
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Total energy calculations of random alloys: Supercell, Connolly-Williams, and CPA methods
- 1998
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Ingår i: COMPUTATIONAL MATERIALS SCIENCE. - : ELSEVIER SCIENCE BV. - 0927-0256. ; 10:1-4, s. 302-305
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We compare the results of total energy calculations obtained by three most popular methods, the supercell method, the Connolly-Williams (CW) method, and the coherent potential approximation (CPA). As a reference we use the result for a supercell of 256 at
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| 3. |
- Zhukovskii, YF, et al.
(författare)
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Quantum-chemical simulations of free and bound hole polarons in corundum crystal
- 1997
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Ingår i: COMPUTATIONAL MATERIALS SCIENCE. - 0927-0256. ; 7:3, s. 285-294
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The semi-empirical method of the so-called intermediate neglect of differential overlap (INDO) has been applied to the calculations of the hole small-radius polarons in corundum crystals, Results for optimized atomic and electronic structure using two dif
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