A New Laser-Registered View of the Shrinkage Kinetics of Foundry Alloys

• Autorzy: Zych J. , Snopkiewicz T.

Identyfikatory

DOI

10.24425/afe.2020.133328

• Języki publikacji: EN

Abstrakty

EN

This paper presents a new stand for studying the linear shrinkage kinetics of foundry alloys. The stand is equipped with a laser displacement sensor. Thanks to this arrangement, the measurement is of a contactless nature. This solution allows for the elimination of errors which occur in measurements made using intermediary elements (steel rods). The supposition of the expansion (shrinkage) of the sample and the expansion of the heated rod lead to the distortion of the image of the actual dimensional changes of the studied sample. A series of studies of foundry alloys conducted using the new stand allowed a new image of shrinkage kinetics to be obtained, in particular regarding cast iron. The authors introduce in the study methodology a real-time measurement of two linked quantities; shrinkage (the displacement of the free end of the sample) and temperature in the surface layer of the sample casting. This generates not only a classic image of shrinkage (S) understood as S = f (t), but also the view S = f (T). The latter correlation, developed based on results obtained using the contactless method, provide a new, so far poorly known image of the course of shrinkage in foundry alloys, especially cast iron with graphite in the structure. The study made use of hypo- and hypereutectic cast iron in order to generate an image of the differences which occur in the kinetics of shrinkage (as well as in pre-shrinkage expansion - expansion occurs during solidification).

Słowa kluczowe

EN

casting shrinkage; cast iron; kinetics of shrinkage; laser measurements

PL

skurcz odlewu; żeliwo; kinetyka skurczu; pomiary laserowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 3
• Strony: 41--46
• Opis fizyczny: Bibliogr. 12 poz., fot., rys., tab., wykr.

Twórcy

autor

Zych J.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

autor

Snopkiewicz T.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

Bibliografia

• [1] Jankowski, W. (1976). Pre-shrinkage expansion and total casting shrinkage of ductile iron. Foundry Review. 26(1), 7-10, (in Polish).
• [2] Pucka, G. (1993). The strain gauge device for continuous measurement of free linear contraction with computer data analysis. II Conference „Computer Methods in Foundry”. Bytom-Gliwice, (in Polish).
• [3] Pucka, G. (1994). Influence of cooling rate on the free linear contraction of selected metals and alloys. Material Engineering. 15(3-4), 91, (in Polish).
• [4] Mutwil, J. (2000). Device for the investigation of casting stresses. Solidification of Metals and Alloys. 2(44), 503-508.
• [5] Mutwil, J. (2000). Linear contraction of aluminium and aluminium-silicon binary alloys in the metal mould. Archives of Machine Technology and Automation. 20(1), 107-116, (in Polish).
• [6] Mutwil, J. (2003). Stand for investigation of linear contraction and shrinkage stresses in castings. Archives of Foundry. 3(8), 287-292.
• [7] Alonso G., Stefanescu D. M., Suarez R., Loizaga A. & Zarrabeitia G. (2014). Kinetics of graphite expansion during eutectic solidification of cast iron. International Journal of Cast Metals Research. 27(2), 87-100.
• [8] Nandori G., Bako K. (1972). Untersuchungen uber die eutektische Ausdehnung und die Ausdehnungkrafte von Gusseisen mit Kugelgraphit. Giesserei Praxis. 23(22), 389-396, (in German).
• [9] Pucka, G., Śleziona, J. & Żak, W. (2000). Solidification and linear shrinkage of composite in the AK12 aluminum alloy matrix reinforced with Al2O3 and SiC particles. Solidification of Metals and Alloys, 2(44), 311-316.
• [10] Kniaginin, G. (1977). Cast steel, metallurgy and foundry. Katowice: Wyd. Śląsk, (in Polish).
• [11] Karsay, S.J. (1980). Risering methods for gray and ductile casting. AFS International Cast Metals Journal. 5(4), 45-51.
• [12] Zych, J. (2019). Ductile iron-risering of castings, mould pouring. Krakow: Akapit, (in Polish).

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)