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1

Analysis of the Impact of Modifiers on the Formation of Non-metallic Inclusions During Continuous Casting of CuZn39Pb2 Brass

Bydałek A. W., Kula A., Błaż L., Najman K.

Archives of Foundry Engineering

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2019

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iss. 3

21--26

EN

In this paper results of microstructural observations for series of CuZn39Pb2 alloys produced from qualified scraps are presented. The individual alloy melts were differentiated in terms of thermal parameters of continuous casting as well as refining methods and modifications. Structural observations performed by SEM and TEM revealed formation of different types of intermetallic phases including “hard particles”. EDS results show that “hard particles” are enrich in silicon, phosphorus, iron, chromium and nickel elements. Additionally, formation of Al-Fe-Si and Al-Cr in alloy melts was observed as well. It was found that quantity and morphology of intermetallic phases strongly depends upon the chemical composition of raw materials, process parameters, modifiers and refining procedure applied during casting. It was observed that refining process results in very effective refinement of intermetallic phases, whereas modifiers, particularly carbon-based, results in formation of large particles in the microstructure.

2

Evaluation of Precipitates Type in Brasses as a Function of Charge Material

Bydałek A. W., Najman K., Kula A., Biernat S., Błaż L., Wołczyński W.

Archives of Foundry Engineering

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2016

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Vol. 16, iss. 3

19--24

EN

Trial series of cast alloy MO59 obtained from qualified scrap was investigated. SEM and TEM of resulting precipitates were conducted. The SEM analysis demonstrated the dependence of silicon, phosphorus, iron, chromium and nickel in the composition of the so-called hard precipitates. TEM analysis showed the formation of phase AlFeSi and AlCr. Made studies have shown the important role of the composition of the batch melts brass CuZn39Pb2 type. The analysis of SEM and TEM resulting precipitates pointed to the formation of various forms of divisions, only one of which was described in the literature character of the so-called hard inclusions. The SEM studies demonstrated the dependence of the occurrence of inclusions rich in silicon, phosphorus, iron, chromium and nickel. In contrast, additional TEM analysis indicated the formation of AlFeSi phase type and AlCr. The results of the analyses referred to the structure of the batch. Due to the difficulty of obtaining recycled materials that do not contain these elements necessary to carry out further analyzes in the direction of defining the role of phosphorus in the formation of the so-called hard inclusions.

3

Modyfikacja mosiądzu ołowiowego MO59 modyfikatorami złożonymi

Kondracki M., Szajnar J.

Archiwum Odlewnictwa

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2003

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R. 3, nr 9

280--286

PL

W artykule zaprezentowano wyniki badań nad modyfikacją mosiądzu ołowiowego MO59 mikrododatkami boru, tytanu, cyrkonu, fosforu i aluminium w obecności wysokiego udziału zanieczyszczeń. Omówiono wpływ tych dodatków na mikro i makrostrukturę.

EN

This article shows the investigation of modification process of leaded brass MO59 (Cu59ZnPb2) with use of complex additions of such elements as boron, titanium, zirconium, aluminium and phosphorus. The influence of modification on micro- and macrostructure was ilustrated.

4

Badanie procesu krystalizacji mosiądzu ołowiowego MO59 przy pomocy ATD

Kondracki M., Gawroński J., Szajnar J., Grzelczak R., Podsiadło K.

Archiwum Odlewnictwa

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2002

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R. 2, nr 4

128--134

PL

W pracy przeprowadzono kompleksową analizę krystalizacji mosiądzu ołowiowego MO59 pod kątem jego własności technologicznych. Podjęto również próbę uzależnienia udziału fazy β’, który jest jednym z czynników kształtujących własności technologiczne, od punktów charakterystycznych na krzywych ATD. Wskazano możliwość oceny przydatności stopu dla przemysłu na podstawie ilości faz w oparciu o wyniki badań metodą ATD.

EN

This work describes a complex analysis of MO59 leaded brass from technological point of view. Authors tried to find a dependence of β’ phase quantity, which is the main factor describing the technological properties and characteristic points of TDA curves. The possibility of suitability evaluation based on TDA of this alloy for fixture industry was shown.