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    Wyświetlanie 1-11 z 11
    Tytuł:
    Tribological behavior of low-alloyed steel after nitriding
    Autorzy:
    Vicen, Martin
    Bokůvka, Otakar
    Nikolić, Ružica
    Bronček, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/1839516.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    low alloyed steels
    nitriding
    tribology
    behavior
    stale niskostopowe
    azotowanie
    trybologia
    zachowanie
    Opis:
    The tribological properties of the nitride layer applied to the low-alloyed steel were investigated in this research. Experimental work included determination if the chemical composition, wear resistance, Rockwell, Vickers and nano-indentation tests, both of the substrate material – the low-alloyed steel and the deposited nitride layer. From the results obtained in those experiments authors concluded that applying the nitride layer does not significantly improve the tribological properties of the tested lowalloyed steel samples, thus this process is not recommended for achieving that purpose.
    Źródło:
    Production Engineering Archives; 2020, 26, 3; 78-83
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxide Layer Evolution of Cast Fe24Cr12NiXNb Heat-Resistant Cast Steels at 900°C in Atmospheric Air
    Autorzy:
    Ramos, P. A.
    Coelho, R. S.
    Pinto, H. C.
    Soldera, F.
    Mücklich, F.
    Brito, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837826.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austenitic cast steel
    microstructure
    Nb-alloyed steels
    oxidation
    staliwo austenityczne
    mikrostruktura
    stal stopowa
    utlenianie
    Opis:
    The austenitic stainless steels are a group of alloys normally used under high mechanical and thermal requests, in which high temperature oxidation is normally present due to oxygen presence. This study examines the oxide layer evolution for Fe24Cr12NiXNb modified austenitic stainless steel A297 HH with 0,09%Nb and 0,77%Nb content at 900°C under atmospheric air and isothermal oxidation. The modifiers elements such as Mo, Co and Ti, added to provide high mechanical strength, varied due to the casting procedure, however main elements such as Cr, Ni, Mn and Si were kept at balanced levels to avoid microstructure changing. The oxide layer analysis was performed by confocal laser scanning microscopy (CLS) and scanning electron microscopy (SEM). The elemental analysis of the different phases was measured with energy dispersive X-ray spectroscopy (EDX). The Nb-alloyed steel generated a thicker Cr oxide layer. Generally elemental Nb did not provide any noticeable difference in oxide scale growth, for the specific range of Nb amount and temperature studied. High temperature oxidation up to 120h was characterized by protective Cr oxidation, after this period a non-protective Fe-based oxidation took place. Cr, Fe and Ni oxides were observed in the multilayer oxide scale.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 125-131
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of welding on the hardness and weldability of thermally hardened S620Q steel sheets
    Autorzy:
    Cicholska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241781.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    low-alloyed quality steels
    heat treatment of S620Q steel
    Opis:
    The thermally hardened 12 mm sheets of S620Q steel underwent research. The sheets weldability was examined during semi-automatic welding by MAG method, at the welding conditions usually applied in industry for welding normalized sheets of this steel. The technology of welding was presented. The achievement of metallically continuous joints was confirmed by X-ray examination. For the purpose of usefulness assessment, samples were taken from test joints then the joints hardness distribution measurements were performed. The microstructure was examined and the static tensile tests as well as technological bend tests were carried out. Hardness measurements were performed in three measurement lines for each joint according to PN-EN 1043-1:2000 requirements. Joints microstructures were examined in the joints axis, in SWC and in native materials. Steel microstructures were classified as low carbon tempered martensite of layered construction. Mean values of the selected joints strengths were also presented. The tensile tests values of native materials of metallurgic certificates were given for the sake of comparison. The research results presented in the paper made it possible to determine the weldability of S620Q steel.
    Źródło:
    Journal of KONES; 2012, 19, 4; 127-130
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The weldability assessment of thermally hardened S540Q steel sheets
    Autorzy:
    Cicholska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/243177.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    low-alloyed quality steels
    heat treatment of S540Q steel
    welded constructions
    Opis:
    High strength thermally hardened steels are more difficult to weld than low carbon construction steels. There is a danger of cold cracking caused by the presence of martensite in welded joints. The thermally hardened 12 mm sheets of S540Q steel underwent research. The sheets were welded semi-automatically by MAG method, in the welding conditions usually applied in industry for welding normalized sheets of this steel. The welding technology was presented. The X-ray tests were performer, which confirmed the achievement of metallically continuous joints. Samples were taken from the joints and the joints hardness distribution measurements were conducted. The microstructure was examined and the static tensile tests as well as technological bend tests were carried out. Hardness measurements were performed in three measurement lines for each joint according to PN-EN 1043-1:2000 requirements. Joints microstructures were examined in the joints axis, in HAZ and in native materials. Steel microstructures were classified as low carbon tempered matrensite of layered construction. Mean values of the selected joints tensile strengths were also presented. The tensile tests values of native materials of metallurgic certificates were given for the sake of comparison. The research results presented in the paper made it possible to determine the weldability of S540Q steel.
    Źródło:
    Journal of KONES; 2014, 21, 4; 43-48
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxygen-blowing remelts of low-alloyed Cr-Mn-Ni-Mo steels with the variable oxidation rate of carbon, chromium and phosphorus
    Wpływ sposobu wytapiania stali niskostopowej na szybkość utleniania węgla, chromu i fosforu
    Autorzy:
    Sobula, S.
    Głownia, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/263917.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wytopy odzyskowe
    świeżenie tlenem
    świeżenie rudą żelaza
    utlenianie fosforu
    staliwa niskostopowe
    remelting process
    oxidation of phosphorus
    oxygen blowing
    Iow alloyed steels
    Opis:
    Low-alloy Cr-Mn-Ni-Mo cast steels and high-alloy manganese cast steels are frequently use as castings in such areas as mineral industry and power industry. Melting technology of these steels is often based on the use the return-scrap in charge, because the prices of nickel and molybdenum are very high. Basic eleetric are furnaces were used in the oxidation remelting of high manganese and Iow alloyed Cr-Mn-Ni-Mo steel scraps. The measuring of bath temperature and chemical eomposition were realized for control of C, P and Cr oxidation rates. This article shows effect of two methods of carbon boil, used in remelting technology: first is carbon oxydation by iron ore and second is oxygen-blowing. The results of these measurements showed that at the oxygen blowing under the pressure of ca 0,6-0,8 MPa and oxygen capacity of 0,37-0,60 Nm3/(min·Mg), the average value of decarburisation rate is 1,03-2,08% C/h, according the temperature of the bath. In the same condition of oxidation, the dephosphorisation rate in Cr-Mn-Ni-Mo is 0-0,12% P/h. It was shown that the temperatures above 1620 degrees C protected steel bath against high chromium losses. At these temperatures the average value of phosphor oxidation rate is 0,070% P/hour.
    Niskostopowe stale chromowo-manganowo-niklowo-molib-denowe i stale wysokostopowe manganowe są chętnie stosowane w przemyśle przeróbczym minerałów i energetyce. Technologia wytwarzania tych stali opiera się głównie na przetapianiu złomu stopowego, ze względu na cenę molibdenu czy niklu. Do przetapiania złomu stali stopowej metodą odzyskowo-tlenową stosowano zasadowe piece łukowe. W celu określenia parametrów utleniania węgla, chromu i fosforu wykonywano pomiary temperatury kąpieli i analizy składu chemicznego. W artykule zamieszczono wyniki utleniania stali za pomocą rudy żelaza i tlenu gazowego. Pokazują one, że zastosowanie tlenu gazowego przy ciśnieniu 0,6-0,8 MPa i przepływie 0,37-0,60 Nm3/(min·Mg), pozwala uzyskać średnią szybkość utleniania węgla 1,03-2,08% C/h, w zależności od temperatury kąpieli. W tych samych warunkach uzyskano szybkość utleniania fosforu 0-0,13% P/h. Wysoka temperatura świeżenia powyżej 1620 stopni C zabezpiecza przed dużymi stratami chromu, i zapewnia średnią szybkość utleniania fosforu 0,070% P/h.
    Źródło:
    Metallurgy and Foundry Engineering; 2005, 31, 1; 67-73
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suitability analysis of thermally hardened S540Q steel sheets for welded constructions working in low temperatures
    Autorzy:
    Cicholska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/246570.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    low-alloyed quality steels
    heat treatment of S540Q steel
    welded constructions
    Opis:
    The conventional heat treatment is being replaced by thermal-plastic treatment. The process of steel hardening is carried out on quenching press with a double-sided water spray at the temperatures ranging from 600 to 700°C. The steel hardening process is conducted at the temperatures of 600-700°C with cooling in the air. After this, thermal hardening the steel sheets obtain the structure of a layered tempered matrensite with carbide and cyanide disperse separations The thermally hardened S540Q steel sheets 12 mm thick underwent examinations. The welding technology was presented. The sheets were welded semi automatically by means of MAG method. The usual welding conditions normally applied in industry were used after steel standardisations. The achievement of joints metallically continuous was confirmed by X-ray tests. The static tensile test was conducted to assess the applicability of this steel. The average values of the welded joints resistance to tensile strength were given. After conducting technological bend, test good ductility was noted. Steel microstructure was defined as low carbon tempered matrensite of layered construction. Microstructure observation was carried out in the joint axis, in heat affected zone and in native material. Hardness measurements were performed according to PN-EN 1043-1:2000 requirements. Impact test was conducted on the samples with a V cut notch at the temperatures of -20, -40, -60 Celsius degrees.
    Źródło:
    Journal of KONES; 2013, 20, 3; 105-109
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suitability analysis of thermally hardened S620Q steel sheets used for welded constructions working in lowered temperatures
    Autorzy:
    Cicholska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/247532.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    ow-alloyed quality steels
    heat treatment of S620Q steel
    welded constructions
    Opis:
    S620Q steel sheets 12 mm thick that were heat treated were subjected to research. The sheets weldability was examined during semi-automatic welding by MAG method, at the welding conditions usually applied in industry for welding normalized sheets of this steel. The achievement of metallically continuous joints was confirmed by X-ray examination, the correctness of making test joints was confirmed by the measurement of transverse warp and edges of sample sections. Moreover the following tests were carried out: static tensile tests, technological bending tests and impact tests on the samples with V-notch cut in positions S, P, C2 and C5. The joints microstructure was observed in the weld axis, in SWC and in native materials with the use of Neophot-2 optical microscope. Steel microstructure was classified as low-carbon, tempered martensite of layered construction. The bend tests were carried out by means of bending arbour 36mm in diameter. The impact energy values for test temperatures -60°C, -40°C and -20°C marked in the drawings are the mean values of breaking three samples at a given test temperature. The places ofnotches cuts applied on welded joints samples are required by Det Norske Veritas regulations for welded joints. Mechanical properties ofS620Q steel were given as reference.
    Źródło:
    Journal of KONES; 2010, 17, 4; 103-108
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Molybdenum Addition on Mechanical Properties of Low Carbon HSLA-100 Steel
    Wpływ dodatku molibdenu na własności mechaniczne niskowęglowej stali HSLA -100
    Autorzy:
    Bogucki, R.
    Pytel, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352005.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength low alloyed steels
    HSLA steels
    effect of copper and molybdenum additions
    microstructure
    mechanical properties
    heat treatment
    stal HSLA
    dodatek miedzi i molibdenu
    mikrostruktura
    właściwości mechaniczne
    obróbka cieplna
    Opis:
    The results of mechanical properties and microstructure observation of low carbon copper bearing steel with high addition of molybdenum are presented in this paper. This steels were characterized by contents of molybdenum in the range from 1% to 3% wt. After the thermo -mechanical processing the steels were subsequently quenched and tempered at different temperatures (500-800°C) for 1h. The changes of mechanical properties as function of tempering temperature were typical for the steel with the copper addition. The sudden drop of impact resistance after tempering from 575°C to 600°C was caused probably by precipitates of Laves phase of type Fe2Mo.
    W pracy przedstawiono wyniki badań własności mechanicznych oraz obserwacji mikroskopowych nisko węglowych stali z dodatkiem Cu o podwyższonej koncentracji molibdenu w zakresie od 1 do 3% wg. Po obróbce cieplno-plastycznej stale były hartowane i odpuszczane w rożnych temperaturach (500-800°C) przez 1 godzinę. Przebieg zmian własności mechanicznych w funkcji temperatury odpuszczania był zbliżony do przebiegu stali z dodatkiem miedzi. Silny spadek udarności po odpuszczaniu od 575 do 600°C spowodowany był prawdopodobnie procesami wydzieleniowymi fazy Lavesa typu Fe2Mo.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 859-864
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitrogen Availability Of Nitriding Atmosphere In Controlled Gas Nitriding Processes
    Rozporządzalności azotu atmosfery azotującej w procesach regulowanego azotowania gazowego
    Autorzy:
    Michalski, J.
    Burdyński, K.
    Wach, P.
    Łataś, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351821.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    controlled gas nitriding
    nitrogen availability
    nitriding potential
    ammonia dissociation rate
    alloyed steels
    kontrolowane azotowanie gazowe
    rozporządzalność azotu
    potencjał azotowy
    stopień dysocjacji amoniaku
    stale stopowe
    Opis:
    Parameters which characterize the nitriding atmosphere in the gas nitriding process of steel are: the nitriding potential KN, ammonia dissociation rate α and nitrogen availability mN2. The article discusses the possibilities of utilization of the nitriding atmosphere’s nitrogen availability in the design of gas nitriding processes of alloyed steels in atmospheres derived from raw ammonia, raw ammonia diluted with pre-dissociated ammonia, with nitrogen, as well as with both nitrogen and pre-dissociated ammonia. The nitriding processes were accomplished in four series. The parameters selected in the particular processes were: process temperature (T), time (t), value of nitriding potential (KN), corresponding to known dissociation rate of the ammonia which dissociates during the nitriding process (α). Variable parameters were: nitrogen availability (mN2), composition of the ingoing atmosphere and flow rate of the ingoing atmosphere (FIn).
    Parametrami charakteryzującymi atmosferę azotującą w procesie azotowania gazowego stali są: potencjał azotowy KN, stopień dysocjacji amoniaku α oraz rozporządzalność azotu mN2. W artykule omówiono możliwości wykorzystania rozporządzalności azotu atmosfery azotującej w projektowaniu procesów azotowania gazowego stali stopowych w atmosferach azotujących uzyskanych z amoniaku, z amoniaku rozcieńczonego zdysocjowanym amoniakiem, azotem oraz azotem i zdysocjowanym amoniakiem. Procesy azotowania wykonano w czterech seriach. Parametrami ustalonymi w poszczególnych seriach była temperatura procesu (T), czas (t), wartość potencjału azotowego (KN), któremu odpowiada określona wartość stopnia dysocjacji amoniaku zdysocjowanego podczas procesu azotowania (α). Parametrami zmiennymi była rozporządzalność azotu (mN2), skład atmosfery wlotowej i natężenie przepływu atmosfery azotującej wlotowej (Fw).
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 747-754
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstate of Basic Phase of High-Alloyed Ferritic Steels
    Autorzy:
    Baranov, M.A
    Dubov, E.A.
    Kawałek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/27315823.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    high-alloyed ferritic steels
    atomic-discrete simulation
    crystal lattice of BP
    wysokostopowe stale ferrytyczne
    symulacja dyskretna
    sieć krystaliczna
    Opis:
    In according with the stated conception the purpose of the present work is the reconstruction of some of innumerable microstates of α phase of ferritic steels, definition of its macroparameters and their subsequent comparison with indicators of mechanical properties of industrially let out steels. The establishment of a correlation between the measured indicators of mechanical properties of already created materials and the calculated state parameters of their basic phase opens an opportunity of mechanical properties prediction of materials in dependence on their prehistory that as a matter of fact represents the central task of material science. Simulation of α-phase state of series of industrially let out ferritic steels and alloys is executed in the assumption of identity of its composition to composition of steel or alloy as a whole. The correlation between indicators of mechanical properties of steels and alloys and state parameters of their basic phase is traced.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 2; 312-320
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Examinations in Corners of the Low-Carbon Steel Slabs from Continuos Caster Machine
    Autorzy:
    Kwinta, G.
    Kara, S.
    Kalandyk, B.
    Zapała, R.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351069.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    API 5L line pipe steels
    low-carbon micro alloyed steel
    microstructure
    non-metallic inclusion
    Opis:
    The exposed selvedge layers in slabs cast by the continuous process should be free from surface defects, which in most cases appear in the form of cracks on the casting surface and run to its interior. In addition to the parameters of the casting process, the occurrence of such defects depends on the chemical composition of cast steel, on the segregation of surface active elements and formation of the precipitates of carbides, nitrides and other phases. Due to the frequent occurrence of defects in corners of the slabs, non-destructive testing was performed on the mechanically cleaned surfaces of slabs. The test material was low-carbon API(American Petroleum Institute API 5L standard) steel micro alloyed with Nb and Ti designed for the production of pipes to handle gas, oil and other liquid and gaseous fuels. Despite the use of different methods of inspection, i.e. ultrasonic, magnetic particle and penetrant, cracks were not traced in the examined material. Then, from the corners of the examined slabs, specimens were cut out for metallographic examinations. The main purpose of these examinations was to disclose the presence of possible cracks and micro cracks on the surfaces transversal and longitudinal to the direction of casting. At the same time, studies were conducted to establish the number and morphology of non-metallic inclusions in selvedge layers of the slab corners and axis. Additionally, hardness of the slabs was measured. The conducted studies revealed only some minor differences in the slab hardness along its axis (130 ÷ 135 HB) and in selvedge layers (120 ÷ 123 HB).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2051-2056
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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