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    Wyświetlanie 1-12 z 12
    Tytuł:
    Comparison of Molding Sand Technology Between Alphaset (APNB) and Furan (FNB)
    Autorzy:
    Ghosh, Dipak K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381891.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Alphaset
    Furan
    foundries
    molding sand
    heat strength
    residual strength
    gases
    environment
    odlewanie
    piasek formierski
    wytrzymałość cieplna
    Opis:
    The paper focuses on investigation of properties of two most widely used self-set sand binder systems APNB and FNB across the Globe, for making molds and cores in foundries to produce castings of different sizes involving wide range of metals and alloys, ferrous and nonferrous. This includes study of compression strength values of samples made out of molding sand at different binder addition level using new, mechanically reclaimed (MR) and thermally reclaimed (TR) sand. Strength values studied include dry strength (at room temperature) at specified intervals simulating different stages of mold handling, namely stripping and pre heating, followed by degraded strength after application of thinner based zircon wash by brush, subsequent lighting of, then checking strength both in warm (degraded strength) & cold (recovered strength) conditions. Throughout the cycle of mold movement from stripping to knock out, strength requirements can be divided into two broad classifications, one from stripping to closing (dry strength) and another from pouring to knock out (hot & retained strength). Although the process for checking of dry strength are well documented, no method using simple equipments for checking hot & retained strength are documented in literature. Attempts have been made in this paper to use some simple methods to standardize process for checking high strength properties using ordinary laboratory equipments. Temperature of 450°C has been chosen by trial & error method to study high temperature properties to get consistent & amplified values. Volume of gases generated for both binders in laboratory at 850°C have also been measured. Nature of gases including harmful BTEX and PAH generated on pyrolysis of FNB and APNB bonded sands are already documented in a publication [1]. This exercise has once again been repeated in same laboratory, AGH University, Poland with latest binder formulations in use in two foundries in India.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 11-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Relative Thickness Reduction and Heat Treatment on AMS 5596 Sheet Mechanical Properties After Flow Forming
    Autorzy:
    Kut, S.
    Maj, P.
    Mrugała, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/357044.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal spinning
    AMS 5596 sheet
    flow forming
    heat treatment
    yield strength
    Opis:
    In the paper the results of experimental research of the process of flow forming of cylindrical drawpieces were presented. The drawpieces were made of the 3.1 mm thick AMS 5596 sheet by drawing process. Tests were performed on two-roller metal spinning machine of a vertical axis Leifeld SFC 800 V500.The main purpose of this research was to determine the relationship between relative thickness reduction and the mechanical properties of tested material. Knowledge of these dependencies is especially useful in designing machines’ components manufactured by flow forming, in the selection of parameters of realization of this technological process as well. Mechanical properties were determined on the basis of uniaxial tensile of the micro samples obtained from the drawpieces: (I) after cold flow forming, (II) after cold flow forming and in-process heat treatment. Obtained results were shown graphically in the diagrams and their analysis was carried out. In addition, the microstructure of the sheet material tested after drawing and flow forming is presented.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1087-1094
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of T6 Heat Treatment Parameters on Technological Quality of the AlSi7Mg Alloy
    Autorzy:
    Pezda, J.
    Jarco, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383288.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    aluminum alloy
    tensile strength
    elongation
    impact strength
    obróbka cieplna
    stop aluminium
    wytrzymałość na rozciąganie
    wydłużenie
    udarność
    Opis:
    Very well-known advantages of aluminum alloys, such as low mass, good mechanical properties, corrosion resistance, machining-ability, high recycling potential and low cost are considered as a driving force for their development, i.e. implementation in new applications as early as in stage of structural design, as well as in development of new technological solutions. Mechanical and technological properties of the castings made from the 3xx.x group of alloys depend mainly on correctly performed processes of melting and casting, design of a mould and cast element, and a possible heat treatment. The subject-matter of this paper is elaboration of a diagrams and dependencies between parameters of dispersion hardening (temperatures and times of solutioning and ageing treatments) and mechanical properties obtained after heat treatment of the 356.0 (EN AC AlSi7Mg) alloy, enabling full control of dispersion hardening process to programming and obtaining a certain technological quality of the alloy in terms of its mechanical properties after performed heat treatments. Obtained results of the investigations have enabled obtainment of a dependencies depicting effect of parameters of the solutioning and ageing treatments on the mechanical properties (Rm, A5 and KC impact strength) of the investigated alloy. Spatial diagrams elaborated on the basis of these dependencies enable us to determine tendencies of changes of the mechanical properties of the 356.0 alloy in complete analyzed range of temperature and duration of the solutioning and ageing operations.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 95-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    T6 Heat Treatment of Hypo-eutectic Silumins in Aspect of Improvement of Rm Tensile Strength
    Autorzy:
    Pezda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379746.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    modification
    ATD
    tensile strength
    obróbka cieplna
    modyfikacja
    wytrzymałość na rozciąganie
    Opis:
    Improvement of properties of silumins in scope of classic methods is connected with changes in morphology of silicon precipitation through: process of modification of alloy, maintaining a suitable temperature of overheating and pouring into moulds, as well as perfection of heat treatment processes. Obtained structure of casting have a direct influence on mechanical and technological properties of machinery parts, and therefore, usage of knowledge on crystallization to control of crystallization’s kinetics of castings in order to optimize obtained structure and introduction of modern methods of heat treatment, enabling considerable improvement of mechanical and technological properties, becomes an important factor. Dispersion hardening with soaking of alloy near temperature of solidus, consisting in heating of poured specimens to temperature of solutioning, keeping in such temperature, cooling down in cold water (20oC), and next operation of artificial ageing have effect on change of tensile strength Rm of a selected hypo-eutectoid silumins. Selection of suitable parameters of dispersion hardening is condition of obtainment of positive results in terms of improvement of tensile strength Rm and has effect on its economic aspects.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 49-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot Formability of Heat-Resistant Stainless Steel X15CrNiSi20-12
    Autorzy:
    Kawulok, R.
    Schindler, I.
    Navrátil, H.
    Ševčák, V.
    Sojka, J.
    Konečná, K.
    Chmiel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355196.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat-resistant stainless steel
    hot tension test
    nil strength temperature
    nil ductility temperature
    Opis:
    High-temperature plastic properties of heat-resistant stainless steel X15CrNiSi20-12 were assessed on the basis of hot tensile tests and nil strength tests. The results were supported by metallographic analyses using SEM and EDX analysis. The formability of the investigated steel can be divided into roughly three temperature areas. In the temperature range of 900°C to about 1050°C, formability was negatively affected by precipitation of carbide particles at grain boundaries. As the temperature rose to 1200°C, these particles dissolved, resulting in an increase in formability. Further temperature increases resulted in a relatively steep drop in formability caused by overheating of the material. The nil ductility temperature of 1280°C and the nil-strength temperature of 1362°C were determined. The Plastic and strength properties of the investigated material were compared with the deformation behavior of the reference steel X5CrNi18-10, which shows a significantly wider range of suitable forming temperatures.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 727-734
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Properties of Composite Produced by Vacuum Sintering of Vanadis 4 Extra Steel Powder with Tantalum Carbides and Following Heat Treatment
    Autorzy:
    Huang, Kuo-Tsung
    Chang, Shih-Hsien
    Chuang, Chan-Yu
    Powiązania:
    https://bibliotekanauki.pl/articles/353735.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tantalum carbide
    Vanadis 4 Extra steel
    transverse rupture strength
    polarization resistance
    sub-zero heat treatment
    Opis:
    In this study, different amounts of tantalum carbide (TaC) powders (5, 10 and 15 wt.%) are added to Vanadis 4 Extra steel powders. The composite powders are sintered at 1260, 1280, 1300, 1320, 1340 and 1360°C for 1 h, respectively. The experimental results showed that good mechanical properties (hardness 79.7 HRA, TRS 2246 MPa) were obtained by the addition of 10% TaC sintered at 1320°C for 1 h. Furthermore, the optimal sintered V4ES/TaC (Vanadis 4 Extra steel / TaC) composites after sub-zero treatment possess the highest hardness (80.9 HRA) and transverse rupture strength (TRS) values (2445 MPa), as well as a better polarization resistance (658.99 Ω·cm2). After sub-zero treatment, the VC carbides decompose and re-precipitate refined VC carbides within the grains (VC carbides are formed in steel powder); moreover, the TaC particles are still uniformly distributed around the grain boundaries, which results in dispersion strengthening and precipitation hardening. The results clearly reveal that sub-zero heat treatment effectively improves the microstructure and strengthens the V4ES/TaC composite.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 555-563
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Shortened Heat Treatment on Change of the Rm Tensile Strength of the 320.0 Aluminum Alloy
    Autorzy:
    Pezda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381551.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    ATD
    heat treatment
    tensile strength
    stop aluminium
    metoda ATD
    obróbka cieplna
    wytrzymałość na rozciąganie
    Opis:
    Mechanical and technological properties of castings made from 3xx.x alloys depend mainly on properly performed process of melting and casting, structure of a casting and mould, as well as possible heat treatment. Precipitation processes occurring during the heat treatment of the silumins containing additives of Cu and/or Mg have effect on improvement of mechanical properties of the material, while choice of parameters of solutioning and ageing treatments belongs to objectives of research work performed by a number of authors. Shortened heat treatment, which is presented in the paper assures suitable mechanical properties (Rm), and simultaneously doesn’t cause any increase of production costs of a given component due to long lasting operations of the solutioning and ageing. Results of the research concern effects of the solutioning and ageing parameters on the Rm tensile strength presented in form of the second degree polynomial and illustrated in spatial diagrams. Performed shortened heat treatment results in considerable increase of the Rm tensile strength of the 320.0 alloy as early as after 1 hour of the solutioning and 2 hours of the ageing performed in suitable.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 75-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators
    Autorzy:
    Pezda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379668.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    aluminum alloys
    ATD
    tensile strength
    hardness HB
    obróbka cieplna
    stopy aluminium
    wytrzymałość na rozciąganie
    twardość
    Opis:
    Heat treatment of a casting elements poured from silumins belongs to technological processes aimed mainly at change of their mechanical properties in solid state, inducing predetermined structural changes, which are based on precipitation processes (structural strengthening of the material), being a derivative of temperature and duration of solutioning and ageing operations. The subject-matter of this paper is the issue concerning implementation of a heat treatment process, basing on selection of dispersion hardening parameters to assure improvement of technological quality in terms of mechanical properties of a clamping element of energy network suspension, poured from hypoeutectic silumin of the LM25 brand; performed on the basis of experimental research program with use of the ATD method, serving to determination of temperature range of solutioning and ageing treatments. The heat treatment performed in laboratory conditions on a component of energy network suspension has enabled increase of the tensile strength Rm and the hardness HB with about 60-70% comparing to the casting without the heat treatment, when the casting was solutioned at temperature 520 oC for 1 hour and aged at temperature 165 oC during 3 hours.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Various Types of Heat Treatment on Mechanical Properties of the EN AC-AlSi6Cu4 Alloy
    Autorzy:
    Jarco, A.
    Pezda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382485.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    aluminum alloy
    ATD method
    elongation
    tensile strength
    obróbka cieplna
    stop aluminium
    metoda ATD
    wydłużenie
    wytrzymałość na rozciąganie
    Opis:
    The Al-Si-Cu alloys with content of the copper from 2 to 4 percent, after solutioning and artificial ageing treatments (T6 heat treatment), feature high strength and very high hardness, however their elongation is considerably reduced. Maintaining value of elongation on the level of initial alloy is possible due to homogenizing treatment performed prior the T6 treatment. Performed strength tests of the initial alloy and the alloy after individual types of the heat treatment enable comparison of obtained results and assessment of usability of the investigated alloy to production of a castings. Test pieces to the strength tests were poured in standardized metal moulds. Parameters of the heat treatment, temperature and duration of heating were established on base of the literature and the ATD diagram performed for the investigated alloy. Investigated EN AC-AlSi6Cu4 alloy after homogenizing treatment becomes plastic, its elongation A5 and its impact strength KC increase nearly three times, with slight decrease of the tensile strength Rm. Dispersion hardening in connection with the homogenizing treatment results in increase of the tensile strength Rm with 68%, hardness and impact strength with 40% with elongation at level of the alloy without heat treatment. Making suitable selection of various types of the heat treatment it is possible, depending on needs, to control mechanical properties of the alloy.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 35-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the production process and heat processing parameters on the fatigue strength of high-grade medium-carbon steel
    Autorzy:
    Lipiński, T.
    Wach, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382766.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obróbka cieplna
    metalografia
    stal
    wytrzymałość zmęczeniowa
    trwałość zmęczeniowa
    proces produkcji
    heat treatment
    metallography
    steel
    fatigue strength
    fatigue durability
    production process
    Opis:
    The experimental material consisted of semi-finished products of high-grade, medium-carbon constructional steel with: manganese, chromium, nickel, molybdenum and boron. The experimental material consisted of steel products obtained in three metallurgical processes: electric and desulfurized (E), electric and desulfurized with argon-refined (EA) and oxygen converter with vacuum degassed of steel (KP). The production process involved two melting technologies; in a 140-ton basic arc furnace with desulphurisation and argon refining variants, and in a 100-ton oxygen converter. Billet samples were collected to analyze: relative volume of impurities, microstructure and fatigue tests. The samples were quenched and austenitized at a temperature of 880 C for 30 minutes. They were then cooled in water and tempered by holding the sections at a temperature of 200, 300, 400, 500 and 600 C for 120 minutes and air-cooled. Fatigue tests were performed with the use of a rotary bending machine at a frequency of 6000 cpm. The results were statistical processed and presented in graphic form. This paper discusses the results of microstructural analyses, the distribution of the relative volume of impurities in different size ranges, the fatigue strength characteristics of different production processes, the average number of sampledamaging cycles and the average values of the fatigue strength coefficient for various heat processing options.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 55-60
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Application of weathered granulated blast furnace slag as a supplementary cementitious material in concrete
    Zastosowanie żużli o długim czasie składowania jako składników cementów powszechnego użytku
    Autorzy:
    Pacierpnik, W.
    Nocuń-Wczelik, W.
    Kapeluszna, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849758.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dodatek do cementu
    dodatek mineralny
    SCM
    żużel
    czas składowania długi
    wietrzenie żużla
    wytrzymałość na ściskanie
    ciepło hydratacji
    mikrostruktura
    supplementary cementing material
    old slag
    slag weathering
    compressive strength
    hydration heat
    microstructure
    Opis:
    The physical and chemical properties of cements with slag originated from the storage yards of different age, added as a supplementary cementing material are highlighted. The materials after 20-year storage, the crushed slag after approximately 2-year storage and the new slag from the ongoing production were compared. The materials supplied by the same metallurgical plant were characterized. The blended cements were produced by Portland cement clinker grinding with gypsum and slags added as 5 to 50% of binder mass. The standard properties of cements were examined, as well as some experiments related to the kinetics of hydration and hydration products were carried out. The addition of granulated blast furnace slag (GBFS) stored for a long time, as a component of cement, affects the properties of material in such a way that the early compressive strength is not specially altered but at longer maturing the strength decreases generally with the storage time and percentage of additive. This is related to the reduction of the vitreous component, as well as to the presence of weathered material of altered activity. At the additive content up to 50% the binder complying with the requirements of the European standards for CEM III/A or CEM II/(A,B)-S common cements can be produced. The cements with the old slag meet the requirements of EN 197-1 relating at least to the class 32,5. The role of calcium carbonate, being the product resulting from the slag weathering process, acting as a grindability and setting/hardening modifying agent, should be underlined.
    Praca dotyczy właściwości cementów zawierających granulowane żużle wielkopiecowe o różnym czasie składowania, z jednego źródła (huty żelaza). Porównano właściwości materiału z żużlem pochodzącym sprzed 20 lat, żużlem składowanym około 2 lat i żużlem z bieżącej produkcji. Cementy wyprodukowano poprzez przemiał klinkieru cementu portlandzkiego z gipsem; udział żużla stanowił od 5% do 50% masy spoiwa. Otrzymane cementy poddano badaniom standardowym; przeprowadzono również ocenę kinetyki i produktów hydratacji. Ustalono w pierwszej kolejności, że wprowadzenie żużla składowanego przez długi czas w charakterze składnika cementów powszechnego użytku wpływa na właściwości cementów w taki sposób, że wytrzymałości wczesne nie ulegają znaczącym zmianom, natomiast wytrzymałość po 28 dniach twardnienia zmniejsza się. Zredukowanie wytrzymałości jest wyraźniejsze w przypadku żużla o długim czasie składowania i przy większym jego udziale. Jest to powiązane ze zmniejszeniem zawartości fazy szklistej w żużlu i obniżeniem aktywności w następstwie procesów wietrzenia. Jednakże i tak przy odpowiednich udziałach żużla w granicy do 50% jest możliwe otrzymanie cementów powszechnego użytku typu CEM III/A lub CEM II/(A,B)-S spełniających wymagania normy EN 197-1 klasy przynajmniej 32,5. Należy podkreślić, że rolę modyfikującą pozytywnie właściwości cementów takie, jak mielność oraz generalnie proces wiązania i twardnienia wydaje się pełnić węglan wapnia tworzący się jako produkt wietrzenia żużli.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 381-398
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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