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    Wyświetlanie 1-8 z 8
    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:
    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:
    Właściwości mechaniczne wysokostopowego, utwardzanego dyspersyjnie staliwa martenzytycznego, poddanego wielostopniowej obróbce cieplnej
    Mechanical properties of high-alloyed dispersion-hardened, martensitic cast steel after multi-stage heat treatment
    Autorzy:
    Kuder, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391739.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    staliwo martenzytyczne
    azot
    obróbka cieplna
    wytrzymałość
    udarność
    martensitic cast steel
    nitrogen
    heat treatment
    strength
    impact resistance
    Opis:
    Wykonano wytop staliwa wysokostopowego Cr-Ni-Cu zawierającego dodatki Mo i Nb oraz podwyższoną zawartość azotu. Odlane wlewki próbne poddano obróbce cieplnej. Wykonano badania metalograficzne przy użyciu mikroskopu optycznego i oznaczenia właściwości mechanicznych. Stwierdzono, że najefektywniejszymi cyklami obróbki cieplnej badanego staliwa są: dla uzyskania najwyższych twardości - przesycanie z temperatury 1060°C i odpuszczanie w 500°C, dla uzyskania najwyższych wytrzymałości - przesycanie i podwójne odpuszczanie w temperaturze 600°C. Dla uzyskania maksymalnego wydłużenia i udarności można zastosować hartowanie z temperatury 950°C z odpuszczaniem w temperaturze 600°C.
    High-alloyed Cr-Ni-Cu cast steel with additions of Mo and Nb and high nitrogen content was melted. The cast test ingots were subjected to a heat treatment. Metallographic examinations were made under an optical microscope and mechanical properties were determined. The most effective heat treatment cycles applied to the examined cast steel have proved to be the following ones: to obtain maximum hardness - solution heat treatment from 1060°C and tempering at 500°C, to obtain maximum strength - solution heat treatment and double tempering at 600°C. To obtain maximum elongation and impact resistance - quenching from 950°C followed by tempering at 600°C.
    Źródło:
    Prace Instytutu Odlewnictwa; 2009, 49, 3; 5-11
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Heat Treatment Parameters on the Toughness of Unalloyed Ausferritic Ductile Iron
    Autorzy:
    Guzik, E.
    Sokolnicki, M.
    Nowak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382323.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile cast iron
    heat treatment
    ADI
    toughness
    mechanical properties
    ausferrite
    żeliwo sferoidalne
    obróbka cieplna
    wytrzymałość
    właściwości mechaniczne
    Opis:
    Studies were carried out to determine the effect of heat treatment parameters on the plastic properties of unalloyed ausferritic ductile iron, such as the elongation and toughness at ambient temperature and at – 60°C. The effect of austenitizing temperature (850, 900 and 950°C) and ausferritizing time (5 - 180 min.) at a temperature of 360°C was also discussed. The next step covered investigations of a relationship that is believed to exist between the temperature (270, 300, 330, 360 and 390°C) and time (5, 10, 30, 60, 90, 120, 150, 180, 240 min.) of the austempering treatment and the mechanical properties of unalloyed ausferritic ductile iron, when the austenitizing temperature is 950°C. The “process window” was calculated for the ADI characterized by high toughness corresponding to the EN-GJS-800-10-RT and EN-GJS-900-8 grades according to EN-PN 1564 and to other high-strength grades included in this standard. Low-alloyed cast iron with the nodular graphite is an excellent starting material for the technological design of all the ausferritic ductile iron grades included in the PN-EN-1624 standard. The examined cast iron is characterized by high mechanical properties stable within the entire range of heat treatment parameters.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 79-84
    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:
    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:
    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
      Wyświetlanie 1-8 z 8

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