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Koloskov, V.M.
Programme and abstracts of the 5. International conference on nuclear spectroscopic investigations of hyperfine interactions (NSI-HFI-5)1993
Programme and abstracts of the 5. International conference on nuclear spectroscopic investigations of hyperfine interactions (NSI-HFI-5)1993
AbstractAbstract
[en] Short communication
Original Title
Priroda anomal'nogo izmeneniya izomernogo sdviga messbauehrovskikh spektrov Fe-57 v malouglovykh granitsakh zeren osobo chistogo vol'frama
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Source
Godovikov, S.K.; Parfenova, V.P. (eds.); Joint Inst. for Nuclear Research, Dubna (Russian Federation); AN SSSR, Moscow (Russian Federation). Fizicheskij Inst.; Moskovskij Gosudarstvennyj Univ., Moscow (Russian Federation); Moskovskij Gosudarstvennyj Univ., Moscow (Russian Federation). Nauchno-Issledovatel'skij Inst. Yadernoj Fiziki; 185 p; 1993; p. 72; 5. International conference on nuclear spectroscopic investigations of hyperfine interactions (NSI-HFI-5); 5. Mezhdunarodnoe soveshchanie po yaderno-spektroskopicheskim issledovaniyam sverkhtonkikh vzaimodejstvij; Dubna (Russian Federation); 22-24 Sep 1993
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AbstractAbstract
[en] Normalized 21/4Cr-1Mo steel has been tempered at 998 K for durations up to 50 h, and then oxidized in air at 773, 873 and 973 K for a maximum duration of 1000 h. The extent of the prior tempering treatment was found to influence the oxidation behaviour of the steel significantly. In general, the oxidation resistance of the steel decreased with increasing duration of prior tempering. However, a pronounced influence has been observed during oxidation at 973 K, when at the end of a 6h exposure the specimens with prior tempering for 50 h were found to have a weight gain 2.5 times more than the specimen without prior tempering. From the results of the pre-and post-oxidation analyses of the oxide-alloy matrix interfaces by SEM/EDAX, the observed oxidation behaviour could be attributed to the degree of depletion of free (effective) chromium from the alloy by the precipitation of secondary phases of chromium compounds during tempering for different durations. The secondary precipitates in the specimen tempered for 50 h at 998 K can become enriched in chromium by one order of magnitude more than that in the specimen with no prior tempering. Such a drastic depletion of chromium from the matrix causes the formation of a less protective inner oxide layer during oxidation. Acoustic emission tests carried out to assess the mechanical stability of the scale showed that the 50 h tempered specimen suffered cracking after about 4 h oxidation at 973 K, which results in subsequent enhanced oxidation. (author)
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[en] The influences of temperature and duration of tempering on hardness and microstructure were investigated at high-temperature martensitic and low-carbon steels with 9% chrome and the further alloying elements molybdenium, vanadium, niobium and partially tungsten. After austenitizing and subsequent air cooling the steels were tempered at temperatures below, at and above Ac1b for different times and finally a hardness test was performed. Making use of the temperature dependence of the hardness tempering diagrams were constructed and the Hollomon-Jaffe-Parameter on the three steels was determined within its application limits. Micrographs of the structure shows the formation of the carbides and the martensite. At tempering temperatures below Ac1b a decrease of hardness occurs, above Ac1b, a hardness rise due to the partial austenitizing was obtained. While hardening below Ac1b, the tempering quality increases from P 91, NF 616 to E 911. (orig.)
[de]
An warmfesten martensitischen Staehlen mit niedrigem Kohlenstoffgehalt, 9% Chrom und den weiteren Legierungselementen Molybdaen, Vanadium, Niob und z.T. Wolfram wurde der Einfluss von Temperatur und Dauer des Anlassens auf Haerte und Gefuege untersucht. Nach dem Austenitisieren und folgender Luftabkuehlung wurden die Staehle bei Temperaturen unter, bei und ueber Ac1b unterschiedliche Zeiten angelassen und einer Haertepruefung unterzogen. Anhand der Haerte wurden Anlassschaubilder erstellt und der Hollomon-Jaffe-Parameter an den drei Staehlen innerhalb seiner Anwendungsgrenzen bestimmt. Gefuegebilder (REM) belegen die Ausbildung der Karbide und des Martensits. Bei Anlasstemperaturen unterhalb Ac1b tritt ein Haerteabfall auf, bei Temperaturen oberhalb Ac1b kommt es infolge der dabei stattfindenden Teilaustenitisierung zu einem Haerteanstieg. Beim Anlassen unterhalb Ac1b nimmt die Anlassbestaendigkeit in der Reihenfolge P 91, NF 616, E 911 zu. (orig.)Original Title
Einfluss des Anlassens auf Gefuege und Haerte warmfester 9%Cr-Staehle
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[en] This paper discusses two deterministic quantities, mean first exit time and escape probability, for the anomalous processes having the tempered Lévy stable waiting times with the tempering index and the stability index . We derive the nonlocal elliptic partial differential equations (PDEs) governing the mean first exit time and escape probability. Based on the analysis of the derived PDEs, some interesting phenomena are observed. (letter)
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Available from http://dx.doi.org/10.1209/0295-5075/117/10009; Country of input: International Atomic Energy Agency (IAEA)
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Nelson, E.; Kohli, A.; Poirier, D. R., E-mail: poirierd@email.arizona.edu2018
AbstractAbstract
[en] A direct method to calculate the tempering response of a tool steel (H13) that exhibits secondary hardening is presented. Based on the traditional method of presenting tempering response in terms of isothermal tempering, we show that the tempering response for a steel undergoing a non-isothermal tempering schedule can be predicted. Experiments comprised (1) isothermal tempering, (2) non-isothermal tempering pertaining to a relatively slow heating to process-temperature and (3) fast-heating cycles that are relevant to tempering by induction heating. After establishing the tempering response of the steel under simple isothermal conditions, the tempering response can be applied to non-isothermal tempering by using a numerical method to calculate the tempering parameter. Calculated results are verified by the experiments.
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ICETINN 2017: International Conference on Emerging Trends in Nanoscience and Nanotechnology; Gangtok, Sikkim (India); 16-18 Mar 2017; Copyright (c) 2018 ASM International; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
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Journal of Materials Engineering and Performance; ISSN 1059-9495;
; CODEN JMEPEG; v. 27(6); p. 2766-2771

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[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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1982; 22 p; 37. Annual Congress of the Brazilian Association of Metals; Rio de Janeiro (Brazil); Jul 1982
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[en] This work provides a novel method for increasing the mechanical strength of porcelain materials. To achieve this was used a ceramic powder prepared from sodium feldspar and clay. This powder was wetted up to 8wt.% with water and pieces of rectangular section are formed by uniaxial pressing at 21MPa. The dried specimens were then sintered in a laboratory furnace (1,218°C). These specimens were subjected to a chemical ion exchange treatment in order to increase their mechanical properties, also known chemical tempering. Temperature and time were varied during chemical treatment according to a factorial design. The results showed an increase of ∼74% in breaking force of porcelain material, providing a reduction of the material thickness greater than 15%. Therefore, the process of chemical tempering can be used to increase the breaking force and consequently decreasing the thickness, saving raw materials and energy in the production process.(Author)
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Available from http://boletines.secv.es
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Boletin de la Sociedad Espanola de Ceramica y Vidrio; ISSN 0366-3175;
; v. 55(5); 5 p

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AbstractAbstract
[en] Retained austenite particles with nanometric dimensions in 9% nickel steels microstructures were observed after different intercritical tempering treatments ranged between 540 degree centigrade and 670 degree centigrade corresponding to the ( α +γ) two-phase field of Fe-Ni diagram. The thermal stability of particles turned out to be strongly influenced by its nickel contents and gradients of this element. The gradients were dependent on time and temperature of tempering. (Author) 14 refs
Original Title
Influencia de los trataminetos de revenidos intercriticos en la concentracion de niquel correspondiente a particulas de austenita residual en un acero con 9% Ni
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Revista de Metalurgia; CODEN RMTGAC; v. 35(3); p. 148-154
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Plaschnick, D.; Knabe, G.; Ihme, B.; Dorschner, H.; Heger, A.
VEB Filmfabrik Wolfen (German Democratic Republic)1986
VEB Filmfabrik Wolfen (German Democratic Republic)1986
AbstractAbstract
[en] This invention comprises a procedure for the dosimetry of ionizing radiation fields by means of analytic materials on the basis of polyethyleneterephthalate (PETP) foils which can be used also for the time domain < 24 h after irradiation. It was found that a immediate constancy of measured values (alterations of transmission) can be obtained by tempering the irradiated foils (temperatures between 80 0C and 125 0C, time up to 30 min)
Original Title
Verfahren zur Dosimetrie ionisierender Strahlungsfelder
Source
29 Oct 1986; 23 Aug 1985; 4 p; DD PATENT DOCUMENT 240448/A/; ?: 23 Aug 1985
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Patent
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Milliken, M.
Rocky Mountain Oilfield Testing Center, Caspar, WY (United States). Funding organisation: USDOE Office of Fossil Energy (FE) (United States)2002
Rocky Mountain Oilfield Testing Center, Caspar, WY (United States). Funding organisation: USDOE Office of Fossil Energy (FE) (United States)2002
AbstractAbstract
[en] Deep Cryogenic Tempering (DCT) is a specialized process whereby the molecular structure of a material is ''re-trained'' through cooling to -300 F and then heating to+175-1100 F. Cryocon, Inc. (hereafter referred to as Cryocon) and RMOTC entered an agreement to test the process on oilfield production components, including rod pumps, rods, couplings, and tubing. Three Shannon Formation wells were selected (TD about 500 ft) based on their proclivity for high component wear rates. Phase 1 of the test involved operation for a nominal 120 calendar day period with standard, non-treated components. In Phase 2, treated components were installed and operated for another nominal 120 calendar day period. Different cryogenic treatment profiles were used for components in each well. Rod pumps (two treated and one untreated) were not changed between test phases. One well was operated in pumped-off condition, resulting in abnormal wear and disqualification from the test. Testing shows that cryogenic treatment reduced wear of rods, couplers, and pump barrels. Testing of production tubing produced mixed results
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29 Apr 2002; 443 Kilobytes; DOE/RMOTC CRADA NO. 2000-010; Available from OSTI as DE00794381
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