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Vasile, T.; Zafiu, G.; Vasilescu, M.; Vasilescu, I.; Sfat, C.
Powder metallurgical high performance materials. Proceedings. Volume 2: P/M hard materials
Powder metallurgical high performance materials. Proceedings. Volume 2: P/M hard materials
AbstractAbstract
[en] To improve the mechanic characteristics, especially hardness and strength, the literature of specialty recommend the use of Cr3C2 carbides more than 0,5 %. In this paper the research made emphasis that also at contents of maximum 0,5 % Cr3C2 can be obtain certain performance for hard alloys from WC-Co system with Cr3C2 addition. (author)
Primary Subject
Source
Kneringer, G.; Roedhammer, P.; Wildner, H. (eds.); Plansee Holding AG, Reutte (Austria); 896 p; 2001; p. 160-167; 15. international Plansee seminar; Reutte (Austria); May 2001
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Miscellaneous
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Conference
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AbstractAbstract
No abstract available
Primary Subject
Record Type
Journal Article
Literature Type
Progress Report
Journal
Journal of Physical Chemistry; v. 74 p. 2714-2718
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AbstractAbstract
[en] The coatings deposited on the surface of a substrate of a material in powder form, by injection in a laser beam, they could have important advantages opposite coatings deposited with other technical. These advantages are a very important decrease of the porosity, an interval of thickness of wide covering, a higher coating hardness, treatment in located areas, etc. In this paper our investigation group presents the problems found utilising this technique: inadequate speed of the particles, unstableness of the powder flow rate, effect of the angle of injection and alterations on the powder flow caused by the protective gas of the laser focusing head. We also present the adopted solutions and the improvements that these solutions have supposed for the properties of the coatings. The influence of the laser processing parameters in the dilution and in the characteristics of the coating is also studied (height of the track, penetration, etc). Our final objective is to contribute to the knowledge of this technique. (Author) 7 refs
Original Title
Problematica de los recubrimientos superficiales realizados con laser e influencia de los parametros de proceso
Primary Subject
Record Type
Journal Article
Journal
Revista de Metalurgia; CODEN RMTGAC; v. 34(2); p. 120-125
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Schwarz, E.
International colloquium on hard-facing materials in nuclear power plants, Avignon, 25-26 September 1980
International colloquium on hard-facing materials in nuclear power plants, Avignon, 25-26 September 1980
AbstractAbstract
[en] Detonation gun coatings in the standard thickness range of 0.05 to 0.20 mm are currently specified used and under evaluation for many applications in different nuclear reactor systems. Deposition of tungsten and chromium carbides on structural components in nuclear reactor is studied to prevent wear, high friction and self-welding. Chosen material combinations have to show long term stability and have to withstand high temperatures, thermal shocks and irradiation stress
Primary Subject
Source
Societe Francaise d'Energie Nucleaire (SFEN), 75 - Paris (France); 235 p; 1980; p. 81-87; SFEN; Paris, France; International colloquium on hard-facing materials in nuclear power plants; Avignon, France; 25 - 26 Sep 1980
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Book
Literature Type
Conference
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AbstractAbstract
[en] A mechanism for modelling the growth of faceted primary M7C3 needles during solidification of chromium carbide overlays is presented for the first time. In contrast with existing models that consider diffusion-controlled growth over the length of the needle, this work disaggregates the flow of solute at the tip (diffusion-controlled) and the faceted sides (interface-controlled). The proposed solution predicts an initial transient followed by a steady state longitudinal growth. The outward growth of the needle prism faces is linear and slow, consistent with interface-dominated kinetics. Abrupt decreases in longitudinal growth rate was observed when the tip of the carbides approached other carbides, consistent a soft-impingement effect when the diffusion field of two carbides a overlap. The model was compared to in-situ visualisation of the solidification of an alloy with primary chromium carbide needles, and was found to match closely to observations.
Primary Subject
Source
S1359645418302489; Available from http://dx.doi.org/10.1016/j.actamat.2018.03.050; Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] The roles of Ti-carbonitrides, chromium carbides and chromium depleted zone in the early stage of pitting corrosion of Alloy 600 were investigated in deaerated 10,000 ppm chloride solution at 90.deg.C. Open circuit potentials and polarization curves of TiC, Cr7C3 and Cr23C6 were also measured to determine their roles on pit initiation in the same test condition. It was observed that fast dissolution of the matrix around Ti-carbonitrides occurred during anodic polarization and immersion test, leading to pit initiation. Corrosion rates of chromium carbides and chromium depleted zone were higher than that of grain of Alloy 600TT, which was attributed to the decrease in the pitting potential and the increase in current density of Alloy 600TT, compared with those of Alloy 600MA. The results obtained were discussed with respect to microchemistry, microstructure and electrochemical behaviors of the precipitates
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Secondary Subject
Source
32 refs, 8 figs
Record Type
Journal Article
Journal
Journal of the Corrosion Science Society of Korea; ISSN 0253-312X;
; v. 27(1); p. 43-51

Country of publication
ALLOY-NI76CR15FE8, ALLOYS, ALUMINIUM ADDITIONS, ALUMINIUM ALLOYS, CARBIDES, CARBON COMPOUNDS, CHALCOGENIDES, CHEMICAL REACTIONS, CHROMIUM ALLOYS, CHROMIUM COMPOUNDS, CORROSION, CORROSION RESISTANT ALLOYS, HEAT RESISTANT MATERIALS, HEAT RESISTING ALLOYS, INCONEL ALLOYS, IRON ALLOYS, MATERIALS, NICKEL ALLOYS, NICKEL BASE ALLOYS, NIMONIC, NITROGEN COMPOUNDS, SULFUR COMPOUNDS, TITANIUM ADDITIONS, TITANIUM ALLOYS, TRANSITION ELEMENT ALLOYS, TRANSITION ELEMENT COMPOUNDS
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Bagui, Sumanta; Tarafder, Soumitra; Laha, Kinkar; Mitra, Rahul, E-mail: sumantabagui@gmail.com
AbstractAbstract
[en] This investigation highlights the creep deformation and rupture behaviour of Nb and Cu added 18Cr-8Ni austenitic stainless steel and compared with those of commercial 18Cr-8Ni steel. Uni-axial creep tests were performed at (288–320) MPa/600 °C and (80–110) MPa/750 °C on Nb and Cu added 18Cr-8Ni austenitic stainless steel. Accelerated creep tests predicted that creep characteristic of the alloy was insignificant or anelastic type below the stress level of ∼166 MPa at 600 °C and ∼57 MPa at 750 °C. True creep exponent value of 8 at (288–320) MPa/600 °C and 4 at (80–110) MPa/750 °C, exhibited that the alloy followed high temperature climb controlled power law creep in the specified creep test condition. The alloy was more creep brittle in nature than that of commercial 18Cr-8Ni austenitic stainless steel. The brittleness was attributed to the presence of Nb(C, N), nano-sized Cu precipitation along the transgranular region and occurrence of Cr23C6 secondary carbides along the grain boundaries. Fractographic features revealed that the alloy was prone to intergranular fracture due to creep cavitation and their linkages. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/2053-1591/aadc8c; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Materials Research Express (Online); ISSN 2053-1591;
; v. 5(11); [18 p.]

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Holcombe, C.E. Jr.
Union Carbide Corp., Oak Ridge, Tenn. (USA). Y-12 Plant
Union Carbide Corp., Oak Ridge, Tenn. (USA). Y-12 Plant
AbstractAbstract
No abstract available
Primary Subject
Source
28 Feb 1972; 17 p
Record Type
Report
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Fernandez Guillermet, A.J.
Comision Nacional de Energia Atomica, San Carlos de Bariloche (Argentina). Centro Atomico Bariloche
Comision Nacional de Energia Atomica, San Carlos de Bariloche (Argentina). Centro Atomico Bariloche
AbstractAbstract
[en] In thermodynamic modelling of phase diagrams it is often necessary to deal with the properties of metastable compounds, which are not known from experiments. As an illustrative example, the Cr3C(oP16) carbide is chosen, which is involved in the modelling of the Me3C(oP16) ('cementite') structure of the Fe-Cr-C system, but is metastable in the Cr-C system. The estimation of its thermodynamic properties, relying on regularities in bonding properties of 3d-transition metal carbides and an account of the vibrational entropy through the so-called 'entropy Debye temperature', are discussed in detail. The predictions are compared with values derived in thermodynamic modelling of the Fe-Cr-C phase diagram. Relying on the present results, calculations of metastable phase-equilibria in the Cr-C system are calculated and these were used in analysing information about Cr3C from splat-quenching experiments. (Author)
Primary Subject
Source
1990; 24 p; Available from Comision Nacional de Energia Atomica, Buenos Aires (AR). Library; Pre-print.
Record Type
Miscellaneous
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AbstractAbstract
[en] When austenitic stainless steels are heat treated in the range of 500∼850 .deg. C, the alloys are sensitized due to the formation of chromium carbide at grain boundaries and then intergranular corrosion occurs. This paper aims to evaluate the intergranular corrosion rate and microstructural change of forged 316L stainless steel. To analyze the microstructure by forging conditions, ferrite phase, sigma phase, intergranular precipitation were observed. In order to evaluate the intergranular corrosion rate. Huey test was performed by ASTM A262. On the base of microstructural observation, ferrite and sigma phases were not detected, and also intergranular precipitation was not revealed in optical microscopic observation. By ASTM A262 Practice A, step structure was shown in all forging conditions. Intergranular corrosion rate gradually increased by Huey test periods but average corrosion rate was under 0.03 mm/month
Primary Subject
Source
19 refs, 11 figs, 2 tabs
Record Type
Journal Article
Journal
Corrosion and Protection; ISSN 1229-4829;
; v. 8(2); p. 63-70

Country of publication
ALLOYS, AUSTENITIC STEELS, CARBIDES, CARBON ADDITIONS, CARBON COMPOUNDS, CHEMICAL REACTIONS, CHROMIUM ALLOYS, CHROMIUM COMPOUNDS, CHROMIUM STEELS, CHROMIUM-MOLYBDENUM STEELS, CHROMIUM-NICKEL STEELS, CHROMIUM-NICKEL-MOLYBDENUM STEELS, CORROSION RESISTANT ALLOYS, HEAT RESISTANT MATERIALS, HEAT RESISTING ALLOYS, HIGH ALLOY STEELS, IRON ALLOYS, IRON BASE ALLOYS, LOW CARBON-HIGH ALLOY STEELS, MATERIALS, MOLYBDENUM ALLOYS, NICKEL ALLOYS, STAINLESS STEELS, STEEL-CR17NI12MO3-L, STEELS, TRANSITION ELEMENT ALLOYS, TRANSITION ELEMENT COMPOUNDS
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