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Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

Open access

M. Mackiewicz, J.L. Mikulski, J. Wańkowicz, S. Kucharski, P. Ranachowski and Z. Ranachowski

REFERENCES [1] IEC /TR 62730 HV polymeric insulators for indoor and outdoor use tracking and erosion testing by wheel test and 5000h test. Edition 1.0 2012-03. [2] A.S. Krzma, M. Albano, R.T. Waters and A. Haddad, Comparative performance of 11 kV silicone rubber polymeric insulators with HVAC and HVDC excitations using the rotating wheel dip test, paper no. 653, Mat. 19 th Int. Symp. on HV Engineering, Pilsen, Czech Republic, August 23-28, 2015. [3] Standard IEC 62217:2012-09. Edition 2.0: Polymeric HV insulators for indoor and outdoor use

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A. Kawałek, H. Dyja, A.M. Gałkin, K.V. Ozhmegov and S. Sawicki

longitudinal band separation, Archives of Metallurgy and Materials 54 , 597-605 (2009). [5] D. Gloaguen, M. Francois, R. Guillen, Evolution of internal stresses in rolled Zr702a, Acta Materialia 50 , 871-880 (2005). [6] Z. Skuza, R. Prusak, R. Budzik, Contemporary elements of system of quality management in metallurgical enterprises, Metallurgy 50 , 2, 13140, April/June 2011. [7] H. Dyja, A. Gałkin, M. Knapiński, K. Ozhmegov, The plastometric test of a zirconium alloy of the Zr-Nb system, Hutnik Wiadomości Hutnicze, 5, 207-209 (2010). [8] L.M. Kachanov, Osnovi

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B. Panic

This paper presents the second phase of model investigations. In the first phase research into flow for the system “gas transporting powder - moving packed bed” was conducted in the physical modeling. The influence of bed, powder and gas parameters on values of interaction forces and phenomena occurring in investigated system was defined.

The article discusses the successive stage of investigations into gas flow carrying the powder through the descending packed bed. The research was performed with the application of mathematical modeling after tests with a physical model in use had been accomplished. The elaborated mathematical model was used to calculate resistance values of gas flow carrying the powder through the descending packed bed, masses of ‘static’ and ‘dynamic’ powders as well as total mass of powder holdup in the bed. Then the verification of the model was done comparing the obtained results with those from the physical model.

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S. Mróz, P. Szota, T. Bajor and A. Stefanik

Abstract

The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of Mg/Al bimetallic specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Bimetallic bars of an outer diameter of 22.5 mm and a cladding layer thickness of 1.7 mm were obtained by the explosive welding method. Samples for formability tests, characterized by a diameter-to-length ratio of 1, were taken from the bars. The theoretical studies and experimental tests were carried out for the temperature range from 300 to 400°C and for different strain rates. Based on the obtained investigation results it has been found that the main parameters influencing the formability of Mg/Al bimetallic bars are strain rate than the process temperature.

Open access

J. Szala and D. Kuc

References [1] F. Grosman, D. Woźniak, Hutnik-Wiadomości Hutniczne 3, 97-104 (2001). [2] K. Laber, H. Dyja, B. Koczurkiewicz, Materials Testing 57 (4), 301-305 (2015). [3] P. Kawulok, R. Kawulok, I. Schindler, S. Rusz, J. Kliber, P. Unucka, K.M. Čmiel, Metalurgija-Metallurgy 3, 299-302 (2014). [4] G. Vander-Voort, The Interlamellar Spacing of Pearlite, http://vacaero.com/informationresources/metallography-with-george--vander-voort. [5] G. Zhang, M. Enomoto, ISIJ International 49

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A. Białobrzeski, J. Pezda and A. Jarco

Abstract

The present work discusses results of preliminary tests concerning the technology of continuous dosage of sodium to a metallic bath from the aspect of modification of EN AC-44200 alloy, through the use of a multiple compound (salt) of sodium. The technology consists in continuous electrolysis of sodium salts occurring directly in a crucible with liquid alloy. As a measure of the degree of alloy modification over the course of testing, the ultimate tensile strength (UTS or Rm) and analysis of microstructure are taken, which confirm the obtained effects of the modification on the investigated alloy. Assurance of stable parameters during the process of continuous modification with sodium, taking into consideration the fact of complex physical-chemical phenomena, requires additional tests aimed at their optimization and determination of a possibility of implementation of such technology in metallurgical processes.

Open access

M. Stachowicz, K. Granat and Ł. Pałyga

Abstract

The paper presents a research on the relation between thermal preparation of chromite sand base of moulding sands containing sodium silicate, hardened with selected physical and chemical methods, and structure of the created bonding bridges. Test specimens were prepared of chromite sand - fresh or baked at 950°C for 10 or 24 hours - mixed with 0.5 wt.% of the selected non-modified inorganic binder and, after forming, were hardened with CO2 or liquid esters, dried traditionally or heated with microwaves at 2.45 GHz. It was shown on the grounds of SEM observations that the time of baking the base sand and the hardening method significantly affect structure of the bonding bridges and are correlated with mechanical properties of the moulding sands. It was found that hardening chromite-based moulding mixtures with physical methods is much more favourable than hardening with chemical methods, guaranteeing also more than ten times higher mechanical properties.

Open access

A. Cwudziński

Abstract

This paper presents the results of computer simulations (Ansys-Fluent) and laboratory experiments (physical water model) carried out to describe the motion of steel flow in the tundish. The facility under investigation is a single-nozzle slab tundish. The internal geometry of consider object was changed by flow control device i.e. subflux turbulence controller (STC). In order to obtain a complete hydrodynamic picture in the tundish furniture variants tested, the computer simulations were performed for both isothermal and non-isothermal conditions. From the performed computer simulations and laboratory experiments (physical modeling) it can be found that, the non-isothermal conditions occurring during continuous steel casting will definitely influence the hydrodynamic pattern forming in the tundishes with STC.

Open access

T. Bajor, H. Dyja and K. Laber

This study presents the results of physical modelling of the processes of metal forming of bars made of magnesium alloy (AZ61) obtained using two research methodologies. The study employed the Gleeble 3800 testing system for simulation of metallurgical processes and a torsion plastometer. Depending on the research methodology used, the examinations were carried out in the temperature range of 200 ÷ 400°C and strain rate of (0.1 - 10 s-1). The results obtained in the study were used to determine the value of yield stress for AZ61 alloy for different strain procedures and different temperatures and strain ratios.