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1
Właściwości tribologiczne stopu AISi17Cu5Mg
Wieszała R., Gonarczyk A.
Rudy i Metale Nieżelazne Recykling
|
2017
|
R. 62, nr 4
16--19
PL
W artykule zaprezentowano badania określające współczynnik tarcia p oraz wielkość zużycia dla stopu AISi17Cu5Mg modyfikowanego zaprawą CuPIO w skojarzeniu z żeliwem EN GJL-350. Opisano charakterystykę testera tribologicznego T-01 (trzpień-tarcza), za pomocą którego realizowano badania oraz metodykę badań tribologicznych. Przedstawiono również analizę powierzchniowego rozkładu pierwiastków dla trzpienia i tarczy Badania zrealizowano w celu stwierdzenia, czy analizowany stop spełnia wygórowane wymagania stawiane materiałom przeznaczonym na tłoki do nowoczesnych silników spalinowych.
EN
The artide presents test to determine the coeffident of friction p and the volume of consumption to AlSil 7Cu5Mg cast alloy modified with CuPW master alloy in combination with cast iron EN GJL-350. The characteristic tribological tester T-01 (pin-on-diskj, by which it was carried out the study and the methodology of tribological investigations. An analysis of surface distribution of elements for the pin and shield. The study was carried out to determine whether the analyzed alloy meets the highest requirements for materials intended for pistons for modern engines.
2
Content available Effect of Casting Die Cooling on Solidification Process and Microstructure of Hypereutectic Al-Si Alloy
Władysiak R., Kozuń A., Pacyniak T.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 4
175--180
EN
The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic alloys: AlSi15 and AlSi19. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified silumins on the research station allowing the cooling of the special permanent probe using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of hypereutectic silumins. The study demonstrated that the use of mold cooled with water mist stream allows in wide range the formation of the microstructure of hypereutectic silumins. It leads to higher homogeneity of microstructure and refinement of crystallizing phases and also it increases subsequently the mechanical properties of casting.
3
Content available Structure of AlSi20 Alloy in Heat Treated Die Casting
Władysiak R., Kozuń A.
Archives of Foundry Engineering
|
2015
|
Vol. 15, iss. 1
113--118
EN
The work is a continuation of research on the use of water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation on crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled a with water mist stream. The study was conducted for unmodified AlSi20 alloy and a modified one with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream and solution heat treatment allows in wide range for the formation of the microstructure of hypereutectic silumins. It leads to the growth of microstructure refinement and spheroidizing of phases in the casting.
4
Content available remote Research on the refinement mechanism of primary silicon particles on the basis of AlSi21CuNi alloy
Szczepanik M., Sokołowski A.
Archives of Mechanical Technology and Automation
|
2014
|
Vol. 34, no. 2
41--50
EN
A modification technology of hypereutectic Al-Si alloys has been known for many years. However, there are divergences among the scholars relating to interpreting the mechanism of phosphorus influence on refinement of the primary silicon particles. This article contributes to confirm the hypothesis of a heterogeneous influence of phosphorus in the process of crystallization of the primary silicon in hypereutectic Al-Si alloys. The existence of particle phases in the microstructure of AlSi21CuNi alloy, which may constitute heterogeneous crystallization centers in the precipitation process in primary silicon, has been proved by the methods of scanning microscopy and EDS microanalysis, as well as line analysis.
PL
Technologia modyfikacji siluminów nadeutektyczych jest znana od wielu lat, jednakże badacze różnie interpretują mechanizm oddziaływania fosforu podczas rozdrabniania pierwotnych kryształów krzemu. Niniejszy artykuł stanowi przyczynek do potwierdzenia hipotezy o heterogenicznym oddziaływaniu fosforu w procesie krystalizacji pierwotnych wydzieleń krzemu w siluminach nadeutektycznych. Metodami mikroskopii skaningowej i mikroanalizy EDS oraz analizy liniowej udokumentowano występowanie w mikrostrukturze siluminu AlSi21CuNi cząstek fazy A1P mogących stanowić ośrodki heterogenicznej krystalizacji w wydzieleniach pierwotnego krzemu.
5
Content available Effect of Water Mist Cooling on Microstructure of Hypereutectic Al-Si Alloy
Władysiak R., Kozuń A.
Archives of Foundry Engineering
|
2014
|
Vol. 14, iss. 3
117--122
EN
The work is a continuation of research on the use water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified AlSi20 alloy and modified with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream allows the formation of the microstructure of hypereutectic silumins. A wide range of solidification temperature of hypereutectic silumins increases the potential impact of changes in the cooling rate on a size, a number and a morphology of preeutectic silicon and eutectic α+β (Al+Si).
6
Content available remote The solidification and structure of Al-17wt.%Si alloy modified with intermetallic phases containing Ti and Fe
Piątkowski J., Formanek B.
Archives of Foundry Engineering
|
2011
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Vol. 11, iss. 4
194-198
EN
The article describes the process of casting and solidification of Al-17wt.%Si alloy that have been modified with composite powder containing the intermetallic phases of Ti and Fe. The chemical and phase composition of the applied modifier was described with the following formula: FeAlx-TiAlx-Al2O3. Applying the method of thermal analysis ATD, the characteristic parameters of the solidification process were determined, and exo-and endothermic effects of the modifying powder on the run of the silumin solidification curves were observed. By the methods of light, scanning, and X-ray microscopy, the structure of alloy and the chemical composition of the dispersion hardening precipitates were examined. A change in the morphology of Al-Si eutectic from the lamellar to fibrous type was reported together with changes in the form of complex eutectics of an Al-Si-Ti and Al-Si-Fe type and size reduction of primary silicon crystals.
7
Content available remote Effect of overheating degree on the solidification parameters of AlSi17CuNiMg silumin
Piątkowski J.
Archives of Foundry Engineering
|
2010
|
Vol. 10, iss. 2
103--106
EN
Melting technology, especially the temperature of overheating and pouring above the liquidus point Tliq as well as the cooling rate, determine alloy macro - and microstructure, and hence also casting performance properties. These parameters affect the solidification process and the formation of shrinkage cavities and porosity. So, it is important to choose the best parameters of the melting and pouring process, since on these parameters the process of crystal nucleation and growth as well as shaping of the alloy primary structure will depend. Hence it follows that the time-temperature treatment of molten alloys, hypereutectic silumins included, will also affect the solidification process. Therefore it is fully justified to examine in extenso the effect of overheating degree on parameters of the hypereutectic silumin solidification (Tliq, TE, Tsol) and temperature of complex eutectic crystallisation (due to additions of Cu, Ni and Mg), the more that these effects have not been so far fully investigated and understood.
8
Content available remote Effect of overheating degree of molten alloy on material reliability and performance stability of AlSi17CuNiMg silumin castings
Piątkowski J., Szymszal J.
Archives of Foundry Engineering
|
2010
|
Vol. 10, iss. 4
173--176
EN
The article discusses the effect of overheating degree (above the casting temperature) on material reliability of AlSi17 silumin. The examined alloys was poured at temperatures, 760; 870 and 980oC, holding the melt for 40 minutes and casting from the temperature of 760oC. The assessment of the impact of the degree of overheating was to analysis the tensile strength. From the results of the static tensile test, the main estimators of the descriptive statistics, and coefficients of variation. Having determined the boundary value δO for Weibull distribution, the value of „m” modulus was computed along with other coefficients of material reliability, proposed formerly by the authors. Basing on the obtained results, a model of Weibull distribution function was developed for the tensile strength with respective graphic interpretation. The time-temperature parameters of the melting and casting technology have been chosen to determine the scatter of resultant parameter (Rm) in function of overheating degree. The time-temperature treatment of hypereutectic AlSi17CuNiMg silumin, through its effect on the cluster structure of molten alloy, is shaping the material reliability and performance stability of castings.
9
Content available remote Thermal analysis and microstructure of master alloys used for modification of silumins
Piątkowski J., Szymszal J.
Archives of Foundry Engineering
|
2009
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Vol. 9, iss. 3
129-132
EN
The study presents the technological backgrounds of the process of melting and casting Al-Co, Al-Ni, and Al-Ti master alloys, used as refiners of the microstructure of cast silumins. Basing on the analysis of phase equilibrium diagrams for an Al-Me (Co, Ni, Ti) system at a temperature of 900oC, the characteristic intermetallic phases of AlxMey were investigated. Due to their similarity with Al and Si in respect of both structure and lattice arrangement, these phases may act as heterogeneous nuclei and promote solution hardening during, e.g., heat treatment. Using the method of thermal analysis ATD, the temperature was plotted in function of time, and then the characteristic values of the solidification parameters of master alloys were read out from the respective curves.
10
Content available remote The phosphorus interaction on the process forming of primary structure of hypereutectic silumins
Piątkowski J.
Archives of Foundry Engineering
|
2009
|
Vol. 9, iss. 3
125-128
EN
In this work the results of investigations concerning the hypereutectic silumins to be used as engine ports have been show. New idea on the interaction mechanism of phosphorus during modification of hypereutectic silumins has been shown. According to this hypothesis the influence of phosphorus is the result of local supercooling caused by evaporation and decompression of phosphorus steam. On the base to propose schematic diagram of the origin of local supercooling as a result of evaporation of phosphorus un microareas with a diversified concentration of silicon of the investigated Al-Si alloys.
11
Content available remote Determination of melting and solidification enthalpy of hypereutectic silumins
Piątkowski J., Szymszal J.
Archives of Foundry Engineering
|
2008
|
Vol. 8, iss. 1
97-100
EN
The study was related with determination of the values of enthalpy of melting and solidification of hypereutectic AlSi18, AlSi21 and AlSi24 silumins modified with phosphorus in the form of Cu-P. The calorimetry, preceded by thermal analysis and derivative thermal analysis (TA and DTA, respectively) was carried out on a high-temperature scanning calorimeter, model MHTC-96, made by SETARAM, applying the method of direct determination of parameters of the high-temperature process, and in particular of the enthalpy of phase transformations. Modern control and measuring instruments coupled with PC computer provide a very precise tool for determination of these transformations. An additional advantage was development of appropriate software called "SETSOFT", owing to which it was possible to determine in an easy way the enthalpy of the investigated phase transformations. Moreover, an additional thermal effect, related most probably with pre-eutectic crystallization of primary silicon, was observed and confirmed by calorimetric examinations.
12
Content available remote Application of calorimetry in evaluation of phase transformations in the selected hypoeutectic silumins
Piątkowski J.
Archives of Foundry Engineering
|
2008
|
Vol. 8, iss. 4
177-180
EN
The investigations of phase transformations described in this study were carried out on hypoeutectic alloys from the Al-Si system (AlSi3, AlSi6 and AlSi9) during heating and cooling. The determination and analysis of characteristic temperature values from the solidification range was made by the DSC method in calorimetric investigations carried out on a high-temperature multi HTC scanning calorimeter. Applying the lever rule, the phase composition of the examined silumins was calculated and compared with the results of DSC calorimetry, obtaining a good correlation of the results.
13
Content available remote Statistical assessment of the effect of chemical composition on mechanical properties of hypereutectic AlSi17CuNiMg silumin
Szymszal J., Piątkowski J., Kliś J.
Archives of Foundry Engineering
|
2007
|
Vol. 7, iss. 3
163-166
EN
The paper presents a statistical assessment of the effect of chemical composition on mechanical properties of hypereutectic AlSi17 silumin, which is expected to act as a counterpart of alloys used by automotive industry and aviation for casting of high-duty engine parts in West European countries and USA. The studies on the choice of chemical composition of silumins were preceded by analysis of the reference literature to state what effect some selected alloying elements and manufacturing technology may have on the mechanical properties (HB, R_m and A5) of these alloys. As alloying additives, Cu, Ni and Mg in proper combinations were used. The alloy after modification with phosphorus (CuF) was cast into a metal mould. Basing on the results obtained, it has been reported that the developed silumin of hypereutectic composition is characterised by properties similar to its Western counterparts.
14
Content available remote Determination of reliability index and Weibull modulus as a measure of hypereutectic silumins survival
Szymszal J., Piątkowski J., Przondziono J.
Archives of Foundry Engineering
|
2007
|
Vol. 7, iss. 3
237-240
EN
The first part of the study describes the methods used to determine Weibull modulus and the related reliability index of hypereutectic silumins containing about 17% Si, assigned for manufacture of high-duty castings to be used in automotive applications and aviation. The second part of the study discusses the importance of chemical composition, including the additions of 3% Cu, 1,5% Ni and 1,5% Mg, while in the third part attention was focussed on the effect of process history, including mould type (sand or metal) as well as the inoculation process and heat treatment (solutioning and ageing) applied to the cast AlSi17Cu3Mg1,5Ni1,5 alloy, on the run of Weibull distribution function and reliability index calculated for the tensile strength Rm of the investigated alloys.
15
Content available remote An assessment of the effect of process history on the structure and mechanical properties of hypereutectic silumins
Szymszal J., Piątkowski J., Gierek A.
Archives of Foundry Engineering
|
2007
|
Vol. 7, iss. 3
167-170
EN
An effect of process history of manufacturing the AlSi17Cu3Mg1.5Ni1,5 alloy on its tensile strenght R_m hardness HB, and elongation A_5 was investigated. The individual elements of process history of the alloy fabrication included: type mould (sand or metal mould), modification process, and type of heat treatment (solutioning and ageing). Basing on a multivariance MANOVA test, it was possible to determine not only the effect of the main parameters, like foundry mould type, modification and heat treatment, but also an interaction of these effects. Consequently it has been concluded that the tensile strenght R_m of the examined alloy is statistically most affected by the process of modification, followed by the type of the applied heat treatment, and the type of foundry mould (metal mould). The strongest interactive effect on the value of R_m had a combination of the process and heat treatment.
16
Content available remote Badania wytrzymałości na rozciąganie krzepnącego siluminu AlSi21CuNiMgMn
Mutwil J., Romankiewicz R., Zamajski W.
Archiwum Technologii Maszyn i Automatyzacji
|
2005
|
Vol. 25, nr 1
55-64
PL
W artykule zaprezentowano hydrauliczne stanowisko do badania wytrzymałości na rozciąganie krzepnących i stygnących metali i stopów. Podczas pomiaru jest rejestrowana siła rozciągająca i wydłużenie testowanego odlewu oraz temperatura na przekroju jego ścianki. Opisano badania wytrzymałości na rozciąganie krzepnącego siluminu AlSi21CuNiMgMn. Badano wpływ dodatków stopowych na wytrzymałość krzepnącego stopu. Badaniom poddano stop niemodyfikowany oraz modyfikowany zaprawą AlCul9P.
EN
A hydraulic test stand for examination of tensile strength of solidifying and cooling metals and alloys has been described. The tensile force, extension of test casting and temperatures of its wall are in measurement registered. The examinations of tensile strength of solidifying AlSi21CuNiMgMn alloy have been described. The influence of alloying elements on tensile strength of solidifying alloy has been examined. The examinations have been carried out on unmodified and modified alloy (with AlCul9P master alloy).
17
Content available remote Wpływ procesu technologicznego na niezawodność stopu odlewniczego AlSi17Cu3Mg, jako tworzywa konstrukcyjnego
Gierek A., Piątkowski J., Szymszal J.
Archiwum Odlewnictwa
|
2001
|
R. 1, nr 2
109--116
PL
Z poddanego rafinacji ciekłego stopu AlSi17Cu3Mg odlano do kokili stalowej dwie grupy próbek walcowych, które różniły się tylko tym, że jedna grupa stanowiła populację statystyczną stopu niemodyfikowanego, natomiast druga – stopu po modyfikacji fosforem. Celem badań porównawczych było określenie modułu Weibulla w oparciu o badania wytrzymałościowe na rozciąganie oraz stwierdzenie na tej podstawie wpływu technologii na niezawodność badanego stopu.
EN
From the refined liquid AlSi17Cu3Mg alloy where poured into the steel mould two groups of samples for strength tests. One of it present an statistic population of cast hypereutectic silumin without previous inoculation, and the second one –hypereutectic silumin modified by phosphorus inoculate. The reason of comparative investigations was determination of Weibulls modulus on the base of strength tests. The influence of technological process on the reliability index of investigated alloy was found.
18
Content available remote Właściwości mechaniczne i trybologiczne siluminu nadeutektycznego po obróbce cieplnej
Piątkowski J., Binczyk F.
Archiwum Odlewnictwa
|
2001
|
R. 1, nr 2
565--570
PL
W pracy przedstawiono wyniki badań właściwości mechanicznych oraz trybologicznych siluminu AlSi17 z dodatkiem Cu, Ni, Mg, Co, Mo i Cr po modyfikacji fosforem oraz po obróbce cieplnej. Największy wpływ na poprawę właściwości mechanicznych po obróbce cieplnej stwierdzono w przypadku siluminu z dodatkami Mg i Cu. Badane siluminy nadeutektyczne korzystnie zachowują się podczas tarcia w skojarzeniu z żeliwem szarym (EN-GJ200) i żeliwem sferoidalnym (EN-GJS-500-7). Wykazano obniżenie współczynnika tarcia ze zwiększeniem nacisku podczas ścierania.
EN
The results of mechanical and selected friction properties of the hypereutectic AlSi17 alloy with a Cu, Ni, Mg, Co, Mo and Cr are presented in this paper. Studies were conducted for hypereutectic AlSi17 alloy modified by phosphorus (0,05wt. %) inoculated after heat treatment. The best increasing of the mechanical properties after Mg and Cu alloy additions are confirmed. The hypereutectic silumins very positive behave during content friction system with the grey cast iron (EN-GJ200) and spheroid graphite iron (EN-GJS-500-7).
19
Content available remote Porównawcza metoda oceny krystalizacji i modyfikacji siluminu nadeutektycznego z dodatkiem W, MO, CR i CO
Binczyk F., Piątkowski J., Smoliński A.
Krzepnięcie Metali i Stopów
|
2000
|
R. 2, nr 43
29--36
PL
Spośród powszechnie stosowanych stopów metali nieżelaznych, istotną rolę odgrywają odlewnicze stopy aluminium, wśród których najbardziej rozpowszechnione są siluminy - czyli stopy aluminium z krzemem oraz różnymi dodatkami stopowymi. Bardzo dobre własności fizyczne i technologiczne sprawiają, iż siluminy znalazły szerokie zastosowanie w rożnych gałęziach przemysłu maszynowego, przede wszystkim w: motoryzacji, lotnictwie, przemyśle precyzyjno-optycznym, gospodarstwa domowego, oraz na różne elementy dla potrzeb przemysłu elektrotechnicznego i elektronicznego. Obok wielu zalet, siluminy posiadają również dość istotną wadę, którą z technicznego punktu widzenia jest skłonność do tworzenia gruboziarnistej struktury, wpływająca niekorzystnie na właściwości mechaniczne odlewów.
EN
The technological assumption and research results of new method of estimation of crystallisation and modification hypereutectic silumins by phosphorous with W, Mo, Cr and Co additives have been shown. The main base of that method is conversation next parameters: melting characteristics, casting solidification of the casts, where one of them is standard sample. The behaviour of technological condition particularly chemical composition, casting and self-cooling condition of the cost are main condition of correct interpretation of the crystallisation and modification. The elaborated method leads to the estimation of the influence alloy addition on the crystallisation and primary structure in four samples simultaneous. One of then is base sample to the comporting. The essension influence of the phosphorus on the increase of temperature crystallisation and influence of the alloy addition on the eutectic crystallisation. The identical mass o f the samples is necessary.
20
Content available remote Mechanizm oddziaływania fosforu w procesie modyfikowania siluminów nadeutektycznych
Binczyk F., Piątkowski J., Smoliński A.
Krzepnięcie Metali i Stopów
|
2000
|
R. 2, nr 43
21--26
PL
Wśród stopów Al stosowanych w odlewnictwie najbardziej rozpowszechnione są siluminy. Swoją populamość stopy te zawdzięczają przede wszystkim dobrym właściwościom odlewniczym (dobra lejność, mały skurcz). Niekorzystną cechą siluminów jest skłonność do tworzenia struktury gruboziarnistej. W siluminach nadeutektycznych duże, nierównomiernie rozłożone pierwotne kryształy krzemu utrudniają, a nawet uniemożliwiają obróbkę skrawaniem. Nierównomiernie rozłożone kryształy krzemu obniżają również właściwości tribologiczne. O ile właściwości mechaniczne poprawić można na drodze obróbki cieplnej, o tyle niekorzystna forma pierwotnych kryształów krzemu, może być zmieniona jedynie w procesie krystalizacji, wpływając na niego poprzez zabieg modyfikacji. Modyfikacja siluminów nadeutektycznych dotyczy w praktyce głównie stopów zawierających 17-25% Si. Są to stopy przeznaczone przede wszystkim w przemyśle motoryzacyjnym na odlewy tłoków silników spalinowych.
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