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    Wyświetlanie 1-7 z 7
    Tytuł:
    Wpływ obróbki cieplnej na korozje stopów Al-Zn-Mg
    The influence of heat treatment on stress corrosion of Al-Zn-Mg alloys
    Autorzy:
    Jurczak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/223210.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    korozje
    obróbka cieplna
    stopy metali
    corrosion
    heat treatment
    alloys
    Opis:
    W artykule przedstawiono wyniki badań własności mechanicznych i odporności na korozję naprężeniową nowego stopu AlZn5Mg2CrZr (próbny wytop przemysłowy) w różnych stanach obróbki cieplnej i porównano z własnościami stopu AlZn5Mg1 zastosowanego w budownictwie okrętowym.
    The paper presents the results of tests on mechanical properties and corrosion resistance of the new alloy AlZn5Mg2CrZr (experimental industrial production) in various stages of heat treatment and of their comparison with the properties of AlZn5Mg1 alloy which is used in shipbuilding.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2006, R. 47 nr 2 (165), 2 (165); 37-50
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design Options to Decrease the Thermal Stresses in Cast Accessories for Heat and Chemical Treatment Furnaces
    Autorzy:
    Bajwoluk, A.
    Gutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380577.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    cast grate
    thermal stress
    heat treatment equipment
    technologia informatyczna
    przemysł odlewniczy
    paleta odlewnicza
    naprężenie termiczne
    obróbka cieplna
    Opis:
    By the very nature of their work, castings used in furnaces for heat treatment and thermo-chemical treatment are exposed to the effect of many unfavorable factors causing their deformation and cracking, significantly shortening the lifetime. The main source of damage are the micro-and macro-thermal stresses appearing in each cycle. As the cost of furnace instrumentation forms a significant part of the total furnace cost, in designing this type of tooling it is important to develop solutions that delay the damage formation process and thus extend the casting operation time. In this article, two structural modifications introduced to pallets castings to reduce thermal stresses arising at various stages of the cooling process are proposed. The essence of the first modification consists in making technological recesses in the wall connections, while the aim of the second one is to reduce the stiffness of the pallet by placing expanders in the external walls. Using the results of simulation analyses carried out by the finite element method, the impact of both proposed solutions on the level of thermal stresses was evaluated.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of hardening elements of tools steel C80U
    Autorzy:
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/122906.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    heat treatment
    phase transformations
    stress
    strain
    numerical modeling
    obróbka cieplna
    przemiany fazowe
    naprężenie
    odkształcenie
    modelowanie numeryczne
    Opis:
    Hardening is one of the manufacturing processes used for improving mechanical properties such as strength, hardness and wear resistances of the mechanical components for machine parts. This paper describes modelling of the processes of steel C80U hardening. The first priority was given to thermal phenomena, phase transformations in a solid state and mechanical phenomena. A numerical algorithm of thermal phenomena was based on the Finite Elements Methods in the Galerkin formula of the heat transfer equations. In the model of phase transformations, in simulations heating process, isothermal or continuous heating (CHT) was applied, whereas in the cooling process continuous cooling (CCT) of the steel. In the model of mechanical phenomena, apart from thermal, plastic and structural strain, transformations plasticity was also taken into account. The stress and strain fields are obtained using the solution of the Finite Elements Method of the equilibrium equation in rate form. The thermophysical constants occurring in constitutive relation depend on temperature and phase composite. In order to determine plastic strain, the Huber-Mises condition with isotropic strengthening was applied, whereas for determination of transformation plasticity a modified Leblond model was used. In order to evaluate the quality and usefulness of the presented models a numerical analysis of temperature field, phase fraction, stress and strain associated hardening process of a cone-shaped fang lathe made of tool steel was carried out.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 4; 35-40
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of constant parameters of copper as power-law hardening material at different test conditions
    Autorzy:
    Kowser, M. A.
    Mahiuddin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/955240.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    power-law hardening constant
    work-hardening process
    stress hardening exponent
    power-law hardening material
    heat treatment
    tensile test
    stress-strain curve
    proces utwardzania
    obróbka cieplna
    próba rozciągania
    Opis:
    In this paper a technique has been developed to determine constant parameters of copper as a power-law hardening material by tensile test approach. A work-hardening process is used to describe the increase of the stress level necessary to continue plastic deformation. A computer program is used to show the variation of the stress-strain relation for different values of stress hardening exponent, n and power-law hardening constant, α . Due to its close tolerances, excellent corrosion resistance and high material strength, in this analysis copper (Cu) has been selected as the material. As a power-law hardening material, Cu has been used to compute stress hardening exponent, n and power-law hardening constant, α from tensile test experiment without heat treatment and after heat treatment. A wealth of information about mechanical behavior of a material can be determined by conducting a simple tensile test in which a cylindrical specimen of a uniform cross-section is pulled until it ruptures or fractures into separate pieces. The original cross sectional area and gauge length are measured prior to conducting the test and the applied load and gauge deformation are continuously measured throughout the test. Based on the initial geometry of the sample, the engineering stress-strain behavior (stress-strain curve) can be easily generated from which numerous mechanical properties, such as the yield strength and elastic modulus, can be determined. A universal testing machine is utilized to apply the load in a continuously increasing (ramp) manner according to ASTM specifications. Finally, theoretical results are compared with these obtained from experiments where the nature of curves is found similar to each other. It is observed that there is a significant change of the value of n obtained with and without heat treatment it means the value of n should be determined for the heat treated condition of copper material for their applications in engineering fields.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 687-698
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cooling Agent on Stress and Deformation of Charge-loaded Cast Pallets
    Autorzy:
    Bajwoluk, A.
    Gutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382504.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    cast grate
    thermal stresses
    heat treatment equipment
    technologia informacyjna
    przemysł odlewniczy
    paleta odlewnicza
    naprężenia cieplne
    obróbka cieplna
    Opis:
    The results of research on the effect of the type of cooling agent used during heat treatment and thermal-chemical treatment on the formation of temperature gradient and stress-deformation distribution in cast pallets, which are part of furnace accessories used in this treatment, are disclosed. During operation, pallets are exposed to the effect of the same conditions as the charge they are carrying. Cyclic thermal loads are the main cause of excessive deformations or cracks, which after some time of the cast pallet operation result in its withdrawal due to damage. One of the major causes of this damage are stresses formed under the effect of temperature gradient in the unevenly cooled pallet construction. Studies focused on the analysis of heat flow in a charge-loaded pallet, cooled by various cooling agents characterized by different heat transfer coefficients and temperature. Based on the obtained temperature distribution, the stress distribution and the resulting deformation were examined. The results enabled drawing relevant conclusions about the effect of cooling conditions on stresses formed in the direction of the largest temperature gradient.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 13-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of stress relief annealing on the microstructure and properties of GX12CrMoVNbN9-1(GP91) cast steel
    Autorzy:
    Golański, G.
    Kupczyk, J.
    Kolan, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/379803.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    cast steel microstructure
    mechanical properties
    martensitic cast steel
    obróbka cieplna
    mikrostruktura staliwa
    właściwości mechaniczne
    staliwo martenzytyczne
    Opis:
    The paper presents an effect of stress relief annealing, applied to casts after the repair by welding, on the microstructure and mechanical properties of quenched and tempered martensitic GX12CrMoVNbN9 – 1 cast steel (called GP91). The test pieces being the subject of research were taken out from a test coupon. Heat treatment of GP91 cast steel was carried out at the parameters of temperature and time appropriate for the treatment of multi-ton steel casts, while stress relief annealing was performed at the temperatures of 730 and 750ºC. After quenching and tempering GP91 cast steel was characterized by the microstructure of high-tempered martensite with numerous precipitations of carbides of diverse size. Mechanical properties of the investigated cast steel after heat treatment fulfilled the standard requirements. Stress relief annealing contributes to the processes of recovery and recrystallization of the matrix as well as the privileged precipitation of M23C6 carbides on grain boundaries. Changes in the microstructure of the examined cast steel cause deterioration in mechanical properties – the higher the temperature of stress relief annealing, the greater the deterioration.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 59-63
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Two-Stage Age Hardening Treatment Combined with Shot Peening on Stress Distribution in the Surface Layer Of 7075 Aluminum Alloy
    Wpływ dwuetapowego procesu starzenia połączonego z kulowaniem na rozkład naprężeń w warstwie wierzchniej stopu aluminium 7075
    Autorzy:
    Kaczmarek, Ł.
    Zawadzki, P.
    Stegliński, M.
    Wójcik, R.
    Klich, M.
    Kyzioł, K.
    Kottfer, D.
    Januszewicz, J.
    Pawłowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/356022.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    heat treatment
    multi stage
    shot peening
    residual stress
    aluminium
    obróbka cieplna
    starzenie dwuetapowe
    śrutowanie
    naprężenie ściskające
    Opis:
    The article present the results of the study on the improvement of mechanical properties of the surface layer of 7075 aluminum alloy via two-stage aging combined with shot peening. The experiments proved that thermo-mechanical treatment may significantly improve hardness and stress distribution in the surface layer. Compressive stresses of 226 MPa±5.5 MPa and hardness of 210±2 HV were obtained for selected samples.
    W ramach niniejszego artykułu przedstawiono wyniki badań dotyczące poprawy właściwości mechanicznych warstwy wierzchniej w stopie aluminium 7075 poprzez kombinacje starzenia dwuetapowego i kulowania. Dowiedziono w ramach prowadzonych badań, że istnieje możliwość znacznego poprawienia twardości oraz rozkładu naprężeń w warstwie wierzchniej stosując obróbkę cieplno-plastyczną. Dla wybranych próbek uzyskiwano naprężenia ściskające na poziomie 226MPa±5,5 MPa oraz twardość rzędu 210±2 HV.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1993-1997
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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