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1
Content available SiMo Ductile Iron Crystallization Process
Stawarz M.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 1
147--152
EN
The article presents crystallization process of silicon molybdenum ductile cast iron (SiMo). The alloy with 5% silicon content and with variable amounts of Mo in a range of 0-1% was chosen for the research. The carbon content in the analysed alloys did not exceed 3,1%. The studies of crystallization process were based on thermal – derivative analysis (TDA). Chemical composition of all examined samples was analysed with the use of LECO spectrometer. Additionally, the carbon and the sulphur content was determined basing on carbon and sulphur LECO analyser. For metallographic examination the scanning electron microscopy (SEM) with EDS analyser was used. Disclosed phases have been also tested with the use of X-ray diffraction. The results allowed the description of crystallization processes of silicon molybdenum ductile cast iron using thermal – derivative analysis (TDA). Conducted studies did not allow for the clear identification of all complex phases containing molybdenum, occurring at the grain boundaries. Therefore, the further stages of the research could include the use of a transmission electron microscope to specify the description of complex compounds present in the alloy.
2
Content available Influence of Boron on Crystallization and Microstructure of Ductile Cast Iron
Dojka R., Studnicki A.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 2
15--20
EN
The objective of the research was to determine the influence of boron on the crystallization process and microstructure of ductile cast iron. In the case of ductile cast iron it is a vital issue because even as little as trace presence of boron changes the properties of ductile cast iron in a significant way. With the use of a new ATD-4 (TDA) tester and CRYSTALDIGRPAH converter it was possible to measure the crystallization process parameters of the same alloy with four different contents of boron in one mould. Four samples with different boron contents were extracted, their microhardness was measured and quantitative analysis of microstructure was conducted. Obtained results allowed to state that with increasing content of boron the amount of graphite precipitates decreases, the amount of pearlite precipitates increases, the shape of graphite precipitates deteriorates and hardness increases. It is also planned to perform additional testings with boron contents between previously tested values.
3
Content available Development of a New ATD-P Tester for Hard Wear Resistant Materials
Dojka M., Dojka R., Studnicki A.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 1
37--40
EN
The aim of presented studies was to develop a new geometry of the overflow part of standard ATD–C tester for derivative thermal analysis in a way that it would allow to obtain samples for abrasion and mechanical properties tests in the same mould without the need of cutting them from a block of material. The pattern of new ATD–P tester has parts reflecting implemented samples. Computer simulations regarding initial verification of new tester were performed in NovaFlow software. Chromium cast iron melts were made for testing the sampler in real conditions and TDA analysis for casting material were conducted. The sandmix was prepared on silica sand matrix according to the ALPHASET technology. This new solution greatly simplifies the preparations of materials difficult to machine.
4
Content available Examining the Possibilities of Analyzing the Solidification Process of Al-Si Alloy with the Infrared Camera
Władysiak R., Kozuń A., Pacyniak T.
Archives of Foundry Engineering
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2016
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Vol. 16, iss. 1
89--94
EN
The paper presents the results of the crystallization process of silumin by the TDA thermographic method and the results of the cast microstructure obtained in the sampler ATD-10, that was cooling down in ambient air. The study was conducted for silumins AlSi8 and AlSi11 unmodified. The work demonstrated that the use of thermal imaging camera allows for the measurement and recording the solidification process of silumin. Thermal curve was registered with the infrared camera and derivative curve that was calculated on the base of thermal curve have both a very similar shape to adequate them TDA curves obtained from measurements using a thermocouple. Test results by TDA thermographic method enable quantitative analysis of the kinetics of the cooling and solidification process of hypo- and neareutectic silumins.
5
Content available remote Possibilities of obtaining and controlling high-quality pressure castings
Pietrowski S., Walczak W., Pisarek B., Władysiak R.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
125-142
EN
The paper presents the influence of the type of furnace charging melting, refining and modification silumins 226 and 231 on the porosity and microstructure of castings. It was shown that in order to reduce or eliminate the porosity of the castings is necessary to the refining ECOSAL-AL113 of liquid silumin both in the melting furnace, and in the ladle and an additional nitrogen, in the heat furnace modified and refining with nitrogen. To control the effects of refining and modifying the TDA method was used. It was found that based on crystallization curve can be qualitatively assess the gas porosity of the castings. In order to control and quality control silumins author developed a computer program using the method of TDA, which sets out: Rm, A5, HB and casting porosity P and the concentration of hydrogen in them. The program also informs the technological procedures to be performed for liquid silumin improper preparation.
6
Content available remote Thermal gradient analysis of solidifying casting
Suchoń J., Cholewa M., Kondracki M.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 3s
107--110
EN
For description of casting solidification and crystallization process the thermal derivative analysis (TDA) is commonly used. Besides the process kinetics considered in TDA method to describe the solidification process, the thermal gradient analysis can be also used for this purpose [1, 2]. In conducted studies analysis of thermal gradient distribution inside the solidifying wedge casting was shown which enabled determination of heat flow intensity on casting section.
7
Content available remote Derivative-gradient thermal analysis in casting properties forecasting
Cholewa M., Kondracki M., Dziuba M.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 20, nr 1-2
339-342
EN
Purpose: The aim of this work was to show possibilities and conception of more accurate structure and mechanical properties forecasting with use of modified derivative -gradient thermal method. Design/methodology/approach: The main restriction in standard thermal and derivative analysis is one point measurement of temperature in casting with assumed geometry. In this work a modified method is described in which restrictions present in TDA method are overcame and more accurate diagnostic of the liquid material can be conducted. Findings: Structural relations have been shown for local conditions of solidification defined by two derivatives dT/dt and dT/dl. Presented method incorporates up-to-date knowledge about structure influence on operating properties of metallic materials. Research limitations/implications: Proposed methodology can be used for cast matrix composite and alloys properties diagnosis and forecasting. However accurate forecasting requires more detailed mathematical description. Originality/value: Proposed conception enables possibility of structure and operating properties forecasting basing upon one physical measurement - temperature measurement.
8
Content available remote Thermal analytical investigations of the magnesium alloy AZ91
Braszczyńska-Malik K. N.
Archives of Foundry Engineering
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2007
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Vol. 7, iss. 2
177-180
EN
The results of thermal derivative analysis (TDA), differential scanning calorimetric (DSC) measurements and microstructure investigations of commercial AZ91 magnesium alloy are presented. The performed examinations allowed to determine the microstructure after solidification process and also precipitation process during continuous heating of supersaturated solid solution. The [alpha]-phase and [alpha]+[gamma] semi-divorced eutectic were observed in as-cast material, whereas both discontinuous and continuous precipitates of [gamma] phase were revealed after heating supersaturated AZ91 alloy.
9
Content available remote Żeliwo sferoidalne z węglikami
Pietrowski S., Gumienny G.
Archiwum Odlewnictwa
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2006
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R. 6, nr 19
233-238
PL
W pracy przedstawiono możliwość otrzymania węglików w żeliwie sferoidalnym stopowym z dodatkiem chromu, miedzi, niklu i molibdenu.
EN
In these paper the possibility obtaining carbides in ductile cast iron with chromium, nickel, copper and molybdenum have been presented.
10
Content available remote Żeliwo Ni-resist o obniżonej zawartości niklu
Pietrowski S., Bajerski Z.
Archiwum Odlewnictwa
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2005
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R. 5, nr 17
445--458
PL
W pracy przedstawiono wyniki badań nad możliwością obniżenia w żeliwie Ni-Resist niklu z 13,50-17,50% do 8,50-10,00% z zachowaniem osnowy austenitycznej. Wykazano również, że poprzez odpowiedni dobór kompozycji manganu, chromu i niklu można sterować procesem krystalizacji eutektycznej żeliwa, oraz temperaturą krystalizacji węglików pierwotnych typu (Fe,Cr,Mn)3C.
EN
In this paper the results of possiblity of nickel contents reduction in Ni-Resist cast iron from 13,50-17,50 to 8,50-10,00% with maintenance of an austenite matrix have been presented. It was demonstrated, that there is the possibly of control of cast iron eutectic crystallization and a crystallization temperature of (Fe,Cr,Mn)3C primary car-bides by proper selection of manganese, chromium and nickel composition.
11
Content available remote Problem eliminacji ołowiu z mosiądzów armaturowych
Kondracki M.
Eksploatacja i Niezawodność
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2004
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nr 2
28-31
PL
W artykule zaprezentowano początkowy etap badań nad wyeliminowaniem ołowiu z mosiądzów armaturowych oraz synergiczny wpływ niektórych pierwiastków na strukturą i własności tych stopów. Przedstawiono porównanie własności technologicznych mosiądzów ołowiowych oraz bezołowiowych, w których dodatek ołowiu zastąpiono przez bizmut.
EN
This paper describes early stages of studies on lead elimination from fixture brasses and synergic influence of some alloy addition on properties and structure of these alloys. Author showed technological properties comparison for leaded and non-leaded brasses in which lead was replaced with bismuth.
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