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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of Strontium Inoculation on Hot Tearing in Aluminium Alloys
    Autorzy:
    Bolibruchová, D.
    Bruna, M.
    Pastirčák, R.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352703.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot tearing
    aluminium alloys
    strontium
    Opis:
    Main aim of submitted work is evaluation and experimental verification of inoculation effect on Al alloys hot-tear sensitivity. Submitted work consists of two parts. The first part introduces the reader to the hot tearing in general and provides theoretical analysis of hot tearing phenomenon. The second part describes strontium effect on hot tearing susceptibility, and gives the results on hot tearing for various aluminium alloys. During the test, the effect of alloy chemical composition on hot tearing susceptibility was also analyzed. Two different Al-based alloys were examined. Conclusions deals with effect of strontium on hot tearing susceptibility and confirms that main objective was achieved.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1837-1842
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Constrained Rod Casting Mold for New Hot Tearing Measurement
    Autorzy:
    Malau, V.
    Akhyar, H.
    Iswanto, P. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/355427.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot tearing
    CRCM-Horizontal
    HTS formula
    casting
    Opis:
    Hot tearing severity was evaluated in this experiment by introducing a new apparatus called Constrained Rod Casting Modified Horizontal (CRCM-Horizontal). Six constraint bars with different lengths can produce hot tearing on the cast sample. Mold position was modified from vertical to horizontal and the shape was changed from a harp shape to a star shape, which allows for the liquid metal to feed into each rod cavity simultaneously. Hot tearing development was recorded along the bars by a digital camera. A new Hot Tearing Susceptibility ( HTS) formula was developed for quantitative investigation of hot tearing on a cast sample. The parameters of the HTS formula are bar length of cast sample (Li), tear severity (Ci) and location of hot tear (Pi). Footprint charts and hot tear scales are used to illustrate hot tearing severity. The experiment was conducted with Al-1.36Zn-1.19Si and Al-5.9Cu-1.9Mg alloys to investigate the sensibility of the apparatus and modification its operation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1201-1208
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of hot tearing evaluation method for Al-based alloys
    Autorzy:
    Brůna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353176.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot tearing
    aluminium alloys
    chemical composition
    solidification interval
    Opis:
    This paper focuses on developing an advanced test method and its use to study hot tearing defects in aluminium alloy castings. The paper consists of two parts. The first part introduces the reader to hot tearing in general, and provides theoretical analysis of the hot tearing phenomenon. The second part describes a newly developed method for assessing hot tearing susceptibility, and also gives the results on hot tearing for various aluminium alloys. During the test, the effect of alloy chemical composition on hot tearing susceptibility was analyzed. Three different Al-based alloys with varying Si, Cu and Ti contents were examined. Conclusions deal with the effect of individual elements on hot tearing susceptibility, and confirm that the main objective was achieved and the proposed method proves to be repeatable and reliable.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 345-349
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Properties of the AlSi9Cu3 Alloy Depending on the Ratio of Returnable Material in the Batch
    Autorzy:
    Matejka, M.
    Bolibruchová, D.
    Chalupová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049423.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu cast alloys
    natural and artificial ageing
    metallography
    mechanical properties
    hot tearing
    Opis:
    Recycling of aluminium returnable material through its reuse is now an essential component of the production of aluminium alloy castings. The main goal is to find a suitable ratio of the primary alloy and the returnable material in the batch, thus determining the right compromise between the price and the quality of the casting. Experimental alloys were evaluated by thermal analysis, combination of structural analytical techniques and selected mechanical properties. The alloys were also subjected to tearing susceptibility testing. The increase in the returnable material amount resulted in changes in the alloy properties at the first increase in volume to 20%. After exceeding the balanced ratio (50:50), there was considerable degradation of the microstructure, failure to achieve the minimum values of some mechanical properties required by the standard, and the alloy showed increased susceptibility to tearing.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 15-23
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High temperature brittleness of cast alloys
    Kruchość wysokotemperaturowa stopów odlewniczych
    Autorzy:
    Telejko, I.
    Adrian, H.
    Guzik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/350902.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kruchość wysokotemperaturowa
    kruchość
    stop odlewniczy
    high temperature brittleness
    hot tearing
    shrinkage brittleness
    mushy state
    Opis:
    Over-all mechanical properties of alloys are extremely low at the last stage of solidification where alloy exists at brittle temperature range (BTR). When the solidification process is completed a sudden and marked change in strength and ductility of metal is observed. It means that as long as liquid phase is present, metal will fail in a brittle manner. There are known different theories of brittleness of alloys in existence of liquid phase. The idea involved by authors of the paper is as follows: three major factors caused by presence of liquid may be taken into account: - decreasing the energy needed for crack nucleation, - increasing atomic diffusional flux out of the crack tip, - creating a path for abnormally quick diffusion of atoms from the crack tip.
    Własności mechaniczne stopów są bardzo niskie w ostatnim stadium krzepnięcia, w którym stop wykazuje kruchość wysokotemperaturową. Przy końcu procesu krzepnięcia obserwuje się nagłą zmianę wytrzymałości i plastyczności metalu. Dopóki występuje faza ciekła metal ulega zniszczeniu w sposób kruchy. Przyczyna tego mogą być trzy główne czynniki związane z obecnością fazy ciekłej: a) spadek energii potrzebnej do zarodkowania pęknięcia, b) wzrost strumienia dyfuzji atomów od wierzchołka pękniecia, c) utworzenie ścieżki do anomalnie szybkiej dyfuzji atomów od wierzchołka pękniecia.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 83-87
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation of Hot Tearing in Sr-B Modified A356 Alloy
    Autorzy:
    Uludağ, M.
    Çetin, R.
    Dışpınar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380985.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A356 alloy
    casting technology
    melt quality
    grain refinement
    hot tearing
    stop A356
    technologia odlewania
    jakość topienia
    rozdrobnienie ziarna
    pękanie na gorąco
    Opis:
    In this work, T-shaped mould design was used to generate hot spot and the effect of Sr and B on the hot tearing susceptibility of A356 was investigated. The die temperature was kept at 250ºC and the pouring was carried out at 740ºC. The amonut of Sr and B additions were 30 and 10 ppm, respectively. One of the most important defects that may exist in cast aluminium is the presence of bifilms. Bifilms can form by the surface turbulence of liquid metal. During such an action, two unbonded surfaces of oxides fold over each other which act as a crack. Therefore, this defect cause many problems in the cast part. In this work, it was found that bifilms have significant effect over the hot tearing of A356 alloy. When the alloy solidifies directionally, the structure consists of elongated dendritic structure. In the absence of equiaxed dendrites, the growing tips of the dendrites pushed the bifilms to open up and unravel. Thus, leading to enlarged surface of oxide to become more harmful. In this case, it was found that these bifilms initiate hot tearing.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 165-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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