Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

Krupiński, M.; Krupińska, B.; Labisz, K.; Rdzawski, Z.; Borek, Wojciech

doi:10.1007/s10973-014-4174-8

Cited by 25 publications

(25 citation statements)

References 13 publications

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“…Hence, the latent heat directly given to the test sample affected the fraction liquid development. Similar estimates were completed for the fraction solid, except that fraction solid was proportionate to the latent heat released during the crystallisation [8,12,13].…”

Section: Methodsmentioning

confidence: 99%

“…The DCP is a fundamental characteristic of as-cast alloys, because it indicates the transition from mass to interdendritic feeding during crystallisation [1,4,7]. Casting defects, such as macrosegregation, shrinkage, porosity and hot tearing begins below the DCP [4,[8][9][10]. Consequently, a thorough , T. Tański*, G. MaTula*, P. snoPiński*, a.E.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Crystallisation Process of Cast Magnesium Alloys Based on Thermal Derivative Analysis / Analiza Procesu Krystalizacji Odlewniczych Stopów Magnezu W Oparciu O Analizę Termicznoderywacyjną

Król¹,

Tański²,

Matula³

et al. 2015

Archives of Metallurgy and Materials

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The paper presents the results of the crystallisation process of cast magnesium alloys based on the thermal-derivation analysis. The effects of aluminium content and cooling rate on the characteristic parameters of the evaluation of magnesium dendrites during solidification at different cooling rates were investigated by thermal-derivative analysis (TDA). Dendrite coherency point (DCP) is defined with a new approach based on the second derivative cooling curve. Solidification behaviour was evaluated via one thermocouple thermal analysis method. Microstructural evaluations were characterised by light microscope, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. This research revealed that utilisation of d2T/dt2 versus the time curve methodology allows for analysis of the dendrite coherency point.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Crystallisation Process of Cast Magnesium Alloys Based on Thermal Derivative Analysis / Analiza Procesu Krystalizacji Odlewniczych Stopów Magnezu W Oparciu O Analizę Termicznoderywacyjną

Król¹,

Tański²,

Matula³

et al. 2015

Archives of Metallurgy and Materials

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“…[4][5][6][7] indicate that the cast zinc alloys with aluminium and copper have a structure consisting of the a 0 solid solution, comprised of the aluminium precipitation, and eutectic grains of a 0 ? g phase, whose morphology depends on the mass concentration of the modifier in the form of Sr, Ce and Ti-B.…”

Section: Investigation Resultsmentioning

confidence: 99%

“…Growing customer demand for components of engineering materials with high mechanical properties and high corrosion resistance is an important reason for extending investigations into improving existing alloys and developing new Zn alloys with enhanced properties and competitive prices [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Additives and thermal treatment influence on microstructure of nonferrous alloys

Krupiński

Krupińska

Rdzawski

et al. 2015

J Therm Anal Calorim

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Although Zn alloys are a very widely used material, there is a need for investigations concerning the influence of thermal conditions on its microstructure and its properties, which makes it useful for the specific tasks it has to fulfil for mass-produced items manufactured by the metalworking industry, in the automotive industry, as well as in countless electronic components. One of the possibilities is to create finer microstructures and enhance their properties, to change their chemical composition by adding alloying additives, and inoculation using modifiers. So in this paper, investigation results are presented concerning the influence of chosen alloying additives, such as Sr, Ce and Ti-B on the measured and calculated thermal characteristics and microstructure of zinc alloys with the addition of aluminium and copper. Based on the results on the phase and chemical composition of the cast Zn-Al-Cu alloys, inoculated with Sr and Ti-B, no differences were detected in the phase composition of the investigated alloys, owing to changes in cooling rates, which were chosen for the sample cooling process. A small amount of added cerium caused the occurrence of new phases present in the microstructure. Modification of the Zn-Al-Cu alloy precipitates changes in the thermomorphology of the phase and the 'tweed' type changes in the microstructure. Moreover, the addition of cerium causes a decrease in the temperature at the beginning (T L ) and the end of the solidification, as well as the occurrence of a multicomponent eutectic, which can be detected on the derivative curve.

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Influence of high strain rates on the structure and mechanical properties of high‐manganes austenitic TWIP‐type steel

Dobrzański

Borek

Mazurkiewicz

2016

Materialwissenschaft Werkst

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The purpose of this paper is to determine the influence of high strain rates on the structure and mechanical properties of high‐Mn austenitic TWIP steel. Low and high strain deformation rates in the range of 0.001 s–1 to 1000 s–1 have a significant effect on the forming of the structure and mechanical properties of high‐manganese austenitic steel. Also, the strain energy per unit volume of advanced high‐Mn TWIP steel containing Mn, Al and SI, with Nb and Ti microadditions, increases considerably in dynamic conditions. This group of steels not only shows excellent strength, but also excellent formability due to twinning, thereby leading to a unique combination of strength, ductility and formability when compared with conventional dual phase steels or transformation induced plasticity TRIP steels. The microstructure of the investigated steel was determined in metallographic investigations using scanning and high‐resolution transmission electron microscopies (HRTEM). Results obtained in static and dynamic conditions for new developed high‐manganese austenitic steel indicate their possible employment for the constructional elements of vehicles, especially passenger cars, to take advantage of the significant growth of their strain energy per unit volume. This guarantees a reserve of plasticity in the zones of controlled energy absorption during possible collision resulting from the activation of twinning induced by cold working, which may lead to a significant growth of the passive safety of these vehicles' passengers.

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Influence of cooling rate on crystallisation kinetics on microstructure of cast zinc alloys

Cited by 25 publications

References 13 publications

Analysis of Crystallisation Process of Cast Magnesium Alloys Based on Thermal Derivative Analysis / Analiza Procesu Krystalizacji Odlewniczych Stopów Magnezu W Oparciu O Analizę Termicznoderywacyjną

Analysis of Crystallisation Process of Cast Magnesium Alloys Based on Thermal Derivative Analysis / Analiza Procesu Krystalizacji Odlewniczych Stopów Magnezu W Oparciu O Analizę Termicznoderywacyjną

Additives and thermal treatment influence on microstructure of nonferrous alloys

Influence of high strain rates on the structure and mechanical properties of high‐manganes austenitic TWIP‐type steel

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