Influence of magnetic field and inoculation on columnar structure transformation

• Autorzy: Szajnar J. , Wróbel T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The main aim of investigations was the reduction of grain size and unification of structure for clean metal casting by introduction of small amount of inoculant, with rotate and impulse reverse magnetic field. Design/methodology/approach: Experimental plan was planed on the basis of statistical factor design on two levels for three variables: pulse frequency, current intensity and inoculant quantity. The output parameters: area of equiaxed crystals zone, average area of equiaxed crystal, average area of columnar crystal and most important equiaxed crystals zone content were calculated by computer program Multi Scan Base (program to processing and image analysis) after macroscopic metallographic research. Findings: The results of investigations and their analysis show relationship between area of equiaxial zone and pouring parameters: induction of magnetic field, pulse frequency of magnetic field and quantity of inoculant sort AlTi5B. Research limitations/implications: Towards lack of resolute relations between casting parameters and structure was selected statistical analysis to determine these relations using stepwise regression. In order to obtain accurate results, authors of this paper are going to extend the resarch range and use Zr and V to inoculation. Practical implications: The work presents refinement of structure methods which are particularly important in continuous and semi-continuous casting where products are used for plastic forming. Large columnar crystals zone result in forces extrusion rate reduction and during the ingot rolling delamination of external layers can occur. Thus, in some cases ingot skinning is needed, which rises the production costs. Originality/value: The value of this paper resides in coupling of two fineness of structure methods. The first method is internal factor – inoculation with Ti+B and the second method is external factor – influence of electromagnetic field on crystallization process.

Słowa kluczowe

EN

working properties of materials and products; magnetic field; inoculation; aluminium

PL

własności eksploatacyjne; właściwości materiałów; właściwości produktów; pole magnetyczne; inokulacja; aluminium

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 209--212
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Szajnar J.

• Division of Foundry, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Wróbel T.

• Division of Foundry, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

• [1] Szajnar J.: The influence of rotating reversing magnetic field on solidification process of cast. Doctors thesis, Silesian University of Technology, Gliwice, 1986, (in Polish).
• [2] Szajnar J., Gawroński J.: The influence of electromagnetic stirring of a flowing metal stream on the cast structure, Proceedings of the 1st Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Gliwice, 1992, p. 183.
• [3] Szajnar J., Gawroński J.: The influence of stirring liquid metal in mould by means of magnetic field on the structure and the characteristic of castings, Proceedings of the 2nd Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Gliwice, 1993, p. 209.
• [4] Szajnar J, Gawroński J.: Method of aluminium and aluminium alloy casting. Patent PL nr 134 861, 5.03.1987 (in Polish).
• [5] Szajnar J., Gawroński J., Cholewa M.: The influence of crystallization conditions in forced convection on surface zone structure of casts, Proceedings of the 3ed Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Gliwice, 1994, p.329, (in Polish).
• [6] Szajnar J.: The columnar to equiaxed transition at casting solidification with convection forced by rotating magnetic field, Scientific book of Silesian University of Technology, Mechanic, 138, Gliwice, 2001 (in Polish).
• [7] Szajnar J., Gawroński J.: Effect of the magnetic field on the transformation of columnar structure of the castings, Foundry Review, vol. 55, No 4, 2005, p. 232, (in Polish).
• [8] Szajnar J., Analysis of columnar crystals growth stability, Proceedings of the 8th Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Gliwice-Rydzyna, 1999, p. 565.
• [9] Gawroński J., Szajnar J.: Modyfication of columnar crystals structure under the influence of casting with forced convection, Proceedings of the 11th Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Zakopane, 2002, p. 199, (in Polish).
• [10] Szajnar J.: Simulation of liquid metal forced convection before paraboloidal solidification front, Proceedings of the 12th Inter. Scien. Confer. Achievements in Mechanical & Materials Engineering AMME, Zakopane, 2003, p. 875, (in Polish).
• [11] Szajnar J.: The columnar crystals shape and castings structure cast in magnetic field, Journal of Materials Processing Technology, 157-158, 2004, p. 761.
• [12] Ponikwia P.: Aluminium alloys casting in impulse magnetic field. Masters thesis, Silesian University of Technology. Foundry Department, Gliwice, 2005, (in Polish).
• [13] Kasperczyk P.: Project and performance of inductor to impulse reverse magnetic field creation. Masters thesis, Silesian University of Technology. Foundry Department, Gliwice, 2003, (in Polish).
• [14] Miś K.: The influence of impulse magnetic field on casts structure. Masters thesis, Silesian University of Technology. Foundry Department, Gliwice, 2005, (in Polish).
• [15] Szajnar J., Stawarz M., Wróbel T.: Inoculation of pure aluminium structure with Ti + B addition in impulse magnetic field, The 11th International Scientific Conference on the Contemporary Achievements in Mechanics, Manufacturing and Materials Science CAM3 S 2005, (on CD), nr 1.173.