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AbstractAbstract
[en] The concept of 'Matrix Steel' developed by G.A. Roberts is used, to produce several High-Steels with matrix similar to M-2 steel and varying quantities of MC type carbide, NbC. The carbide was obtained by adding C and Nb stoichiometrically. The resultant steels exhibit hardness in the range of 63 to 64HRC when hardened at 1.2000C and double tempered at 5400C, which satisfies the requirements of ASTM Standard A-600. An upper limit of -3% is set in the allowed amount of Nb due to the size of the carbide particles. (Author)
[pt]
Utiliza-se do conceito de 'matrix steel' desenvolvido por G.A. Roberts, para a obtencao de uma serie de acos rapidos com matriz de mesma composicao que a do aco M-2, e quantidades variaveis de carbonetos do tipo MC, pela adicao de carbono e niobio na proporcao do carboneto NbC. Os resultados mostram que esses acos atingem dureza na faixa 63-64HRC, com tempera de 1.2000C e duplo revenido de 5400C, atendendo as exigencias da norma ASTM A-600. As dimensoes dos carbonetos restringem, porem, a adicao de niobio a cerca de 3%. Para fins comparativos foram examinados acos equivalentes, onde os carbonetos MC foram introduzidos atraves da adicao de vanadio. (Autor)Original Title
Desenvolvimento de acos rapidos contendo niobio baseados no conceito de 'matrix steel'
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Source
1982; 22 p; 37. Annual Congress of the Brazilian Association of Metals; Rio de Janeiro (Brazil); Jul 1982
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Miscellaneous
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Conference
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AbstractAbstract
[en] Recrystallization in a deformed, supersaturated austenitic stainless steel was studied. Concurrent precipitation of niobium carbide occurs, giving rise to long bands of precipitate particles separated by regions which are essentially precipitate-free. The observed pattern of precipitation is shown to be a result of nucleation and growth of particles prior to recrystallization on the dislocation substructures of the deformed grains. 5 figures
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Journal Article
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Acta Metallurgica; v. 25(8); p. 939-943
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AbstractAbstract
No abstract available
Original Title
Bremsstrahlungsisochromaten von Karbiden der Uebergangsmetalle der Gruppen IVa und Va
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Spring meeting Freudenstadt '80 of the Arbeitskreis Festkoerperphysik of the DPG; Freudenstadt, Germany, F.R; 24 - 28 Mar 1980; Short communication only.
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Journal Article
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Conference
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Verhandlungen der Deutschen Physikalischen Gesellschaft; (no.15); p. 288
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AbstractAbstract
No abstract available
Original Title
Patent
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Source
14 Jan 1975; 6 p; US PATENT DOCUMENT 3,860,445
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Patent
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Spitz, J.; Aubert, A.
CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France). Dept. de Metallurgie1975
CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France). Dept. de Metallurgie1975
AbstractAbstract
[en] The preparation of niobium nitride and carbonitride thin films by reactive sputtering either of a niobium or niobium-carbon target under partial pressure of nitrogen or nitrogen and methane has been studied. The influence of the experimental conditions on composition, structure and electrical properties of the deposited materials are investigated in each case. The correlations observed between the nature of the deposited materials and their superconductive properties are related
[fr]
On a etudie la preparation de couches minces de nitrure et de carbonitrure de Nb par pulverisation reactive d'une cible en Nb ou Nb-C sous pression partielle d'azote ou du melange azote-methane. On a etudie l'influence des conditions experimentales sur la composition, la structure et les proprietes electriques du materiau depose. On rapporte les correlations observees entre la nature du materiau depose et les proprietes supraconductricesPrimary Subject
Source
28 Apr 1975; 12 p; 5. International conference on chemical vapour deposition (CVD-5); Stoke Poges, UK; 22 Sep 1975
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Report
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Conference
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AbstractAbstract
No abstract available
Original Title
Phononendispersion von unterstoechiometrischem Niobkarbid
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Source
Spring meeting of the Arbeitskreis Festkoerperphysik of the DPG; Muenster, F.R. Germany; 17 Mar 1975; AED-CONF--75-056-082; Short communication only.
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Journal Article
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Conference
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Verh. Dtsch. Phys. Ges., Reihe 6; v. 10(5); p. 616
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AbstractAbstract
No abstract available
Original Title
Issledovanie prirody plastinchatykh vydelenij v karbide niobiya potentsiostaticheskim metodom
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Source
Short note. For English translation see the journal Soviet Progress in Chemistry (USA).
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Journal Article
Journal
Ukrainskij Khimicheskij Zhurnal; ISSN 0041-6045; 
; v. 49(8); p. 889-890
; v. 49(8); p. 889-890
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AbstractAbstract
No abstract available
Original Title
Vyyavlenie dislokatsij v karbide niobiya
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Journal Article
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Progress Report
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Kristallografiya; v. 15(1); p. 193-194
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AbstractAbstract
[en] Using the double-shell model in a slab geometry, we calculate the surface phonons on the NbC (001) and TaC(001) surfaces for what we believe to be the first time. A small anomaly is found in the dispersion curve of the Rayleigh mode along the Gamma-bar--M-bar symmetry axis. Its magnitude is very small for NbC and is not inconsistent with recent observations. Moreover, the observed above-bulk mode is very well reproduced by our model. On the other hand, the agreement with the experiment is not so good for the optical modes. We propose possible changes of the shell-model parameters at the surface to resolve this disagreement
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AbstractAbstract
No abstract available
Original Title
O temperaturno-kontsentratsionnoj zavisimosti ''ehffektivnogo'' koehffitsienta diffuzii v oblasti gomogennosti karbida niobiya
Primary Subject
Source
Deposited article; for English translation see the journal Russ. J. Phys. Chem.
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Journal Article
Journal
Zhurnal Fizicheskoj Khimii; v. 52(2); p. 513
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