Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way

• Autorzy: Ignaszak Z. , Hajkowski J.

Identyfikatory

DOI

10.1515/afe-2015-0026

• Języki publikacji: EN

Abstrakty

EN

The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evaluated. This alloy was served to cast the test casting by HPDC method. The penetrating testing (PT) and metallographic study of both kinds of castings were realized. The application of the NF&S simulation system allowed virtually to indicate the porosity zones at risk of a particular type in gravity and high-pressure-die-castings. The comparing of these results with the experiment allowed to conclude about NF&S models validation. The validity of hypotheses concerning the mechanisms of formation and development of porosity in HPDC casting were also analyzed.

Słowa kluczowe

EN

Al-Si alloy; gravity; high pressure; die casting; microstructure; gas porosity; shrinkage porosity; virtualization process; complementary model validation

PL

stop Al-Si; odlewanie ciśnieniowe; porowatość gazowa; wirtualizacja; walidacja modelu

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2015
• Tom: Vol. 15, iss. 1
• Strony: 143--151
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Ignaszak Z.

• CAD/CAE Laboratory of Materials Technology in Institute of Material Technology, Poznan University of Technology, 3 Piotrowo Street, 60-965 Poznan, Poland

autor

Hajkowski J.

• CAD/CAE Laboratory of Materials Technology in Institute of Material Technology, Poznan University of Technology, 3 Piotrowo Street, 60-965 Poznan, Poland

Bibliografia

• [1] Campbell, J. (2000), Castings, Butterworth-Heinemann.
• [2] Ignaszak, Z., Hajkowski, J. & Popielarski, P. (2013). Examples of new models applied in selected simulation systems with respect to database. Archives of Foundry Engineering. 13(1), 45- 50.
• [3] Pucher, P., Böttcher, H., Kaufmann, H., Antrekowitsch, H., Uggowitzer, P.J. (2011). Mechanical properties and casting characteristics of the secondary aluminum alloy AlSi9Cu3(Fe) (A226). Supplemental Proceedings: Volume 2: Materials Fabrication, Properties, Characterization, and Modeling TMS (The Minerals, Metals&Materials Society). 237-244.
• [4] Martinez, D., E. ., Cisneros G., M.A., Valtierra, S. & Lacaze, J. (2005). Effect of strontium and cooling rate upon eutectic temperatures of A319 aluminum alloy. Scripta Materialia. 52, 439-443.
• [5] Bäckerud, L., Chai, G. & Tamminen, J. (1990). Solidification Characteristics of Aluminium Alloys. Foundry Alloys, AFS/Skanaluminum. 2, 71-84.
• [6] Samuel, F.H., Samuel, A.M., & Doty, H.W. (1996). Factors controlling the type and morphology of Cu-containing phases in 319 Al alloy. AFS Trans, 104, 893.
• [7] Ignaszak, Z., Popielarski, P., Hajkowski, J., Prunier, J-B. (2012). Problem of acceptability of internal porosity in semifinished cast product as new trend – “tolerance of damage” present in modern design office. Defect and Diffusion Forum. 326-328, 612-619. DOI: 10.4028/www.scientific.net/ DDF.326-328.612.
• [8] Dobrzański, L.A., Nowosielski, R. (1987). Methods of test for metals and alloys. The study of physical properties. Warszawa: WNT. (in Polish).
• [9] Ignaszak, Z., Hajkowski, J., Popielarski, P. (2013). Mechanical properties gradient existing in real castings taken into account during design of cast components. Defect and Diffusion Forum. 334-335, 314-321. DOI: 10.4028/www.scientific.net/DDF.334-335.314.
• [10] NovaFlow&Solid ver.4.5.5. system. Calibrate module.
• [11] http://www.migweld.de.
• [12] Niu, X.P., Hu, B.,Pinwill, I. & Li, H. (2000). Vacuum assisted high pressure die casting of aluminium alloys. Journal of Materials Processing Technology. 105, 119-127.
• [13] Verrana, G.O., Mendes, R.P.K. & Rossi, M.A. (2006). Influence of injection parameters on defects formation in die casting Al12Si1,3Cu alloy: Experimental results and numeric simulation. Journal of Materials Processing Technology. 179, 190-195.
• [14] Ignaszak, Z. (2002). Virtual prototyping foundry: database and validation. Poznań. Wyd. Politechniki Poznańskiej. (in Polish).
• [15] Eigenfeld, K., Klan, S. & Wechselberger, O. (2001). The hydrogen content in aluminum alloys - comparative measurements using the "CHAPEL" and device "Alu Speed Test”. Biuletyn Metals&Minerals, Technika Pomiarowa. 2, 42-46.
• [16] Jura, Z., Jura, J. (2005). ATD-Crystaldigraph, Gliwice.
• [17] Hufnale, W. (1983), Aluminium-Taschenbuch. Dusseldorf.
• [18] http://www.foseco.com.
• [19] Hajkowski, J., Ignaszak, Z., Hajkowski, M., Popielarski, P. (2012). Report. Unpublished work sponsored by Polish Ministry of Science and High Education, grant no N N508 444436, Poznan University of Technology.