Feeding and Cooling and Time of Thermal Treatment of a Massive Bush Made of the Complex Aluminum Bronze Cast by the Lost Foam

• Autorzy: Just P. , Pisarek B. P.

Identyfikatory

DOI

10.2478/afe-2014-0083

• Języki publikacji: EN

Abstrakty

EN

Small additions of Cr, Mo and W to aluminium-iron-nickel bronze are mostly located in phases &kappa i (i=II; III; IV),and next in phase &alpha (in the matrix) and phase γ2. They raise the temperature of the phase transformations in aluminium bronzes as well as the casts’ abrasive and adhesive wear resistance. The paper presents a selection of feeding elements and thermal treatment times which guarantees structure stability, for a cast of a massive bush working at an elevated temperature (650–750°C) made by means of the lost foam technology out of composite aluminium bronze. So far, there have been no analyses of the phenomena characteristic to the examined bronze which accompany the process of its solidification during gasification of the EPS pattern. There are also no guidelines for designing risers and steel internal chill for casts made of this bronze. The work identifies the type and location of the existing defects in the mould’s cast. It also proposes a solution to the manner of its feeding and cooling which compensates the significant volume contraction of bronze and effectively removes the formed gases from the area of mould solidification. Another important aspect of the performed research was establishing the duration time of bronze annealing at the temperature of 750°C which guarantees stabilization of the changes in the bronze microstructure – stabilization of the changes in the bronze HB hardness.

Słowa kluczowe

EN

innovative materials; innovative casting technologies; lost foam; aluminium bronze; casting properties; riser head; steel internal chill; thermal treatment

PL

nowoczesne materiały; innowacyjne technologie odlewnicze; właściwości odlewów; obróbka termiczna

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2014
• Tom: Vol. 14, iss. 4
• Strony: 39--44
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., tab.

Twórcy

autor

Just P.

• Department of Materials Engineering and Production Systems, Lodz University of Technology 1/15 Stefanowskiego Street, 90-924 Lodz, Poland

autor

Pisarek B. P.

• Department of Materials Engineering and Production Systems, Lodz University of Technology 1/15 Stefanowskiego Street, 90-924 Lodz, Poland

Bibliografia

• [1] Pisarek, B. (2011). Simulation of volumetric shrinkage Sv and surface shrinkage Svp. In Pietrowski S. (Eds.). High quality Foundry Technologies, Materials and Casting, (pp. 167-208). Katowice – Gliwice, PAN.
• [2] Pisarek, B. (2013). Aluminum bronzes with additions of Cr, Mo and/or W with high resistance to wear. Scientific Papers No. 1141, Scientific Dissertations. 441, Łódź: Ed. Lodz University of Technology.
• [3] Górny, Z. (2006). Casting aluminum bronzes. Kraków: Foundry Research Institute.
• [4] Jolly, M. (2005). Prof. John Campell’s Ten Rules for Making Reliable Castings. JOM. May, 19-28.
• [5] Pacyniak, T. & Kaczorowski, R. (2007). Pressure of gas in gas gap during Lost Foam process. Archives of Foundry Engineering. 7(4), 137-140.
• [6] Pacyniak, T. (2006). Theoretical and technological grounds of the lost foam casting process. Scientific Papers No. 985, Łódź Ed. Lodz University of Technology.
• [7] Mai, R. (1981). Giessereitechnik. 27(2), 48-49.
• [8] Karwiński, A. & Haratym, R. (2006). Checking the dimensional accuracy in lost foam technology. Archives of Foundry Engineering. 6(2), 213-218.
• [9] Karwiński, A., Haratym, R. & Żółkiewicz, Z. (2009). Determination of capability of employment of EPS models for execution of precise cast. TEKA. IX, 97-103.
• [10] Pysz, S., Żółkiewicz, Z., Żuczek, R., Maniowski, Z., Sierant, Z., & Młyński, M. (2010). Simulation studies of mould filling conditions with molten metal in evaporative pattern technology. Scientific Papers. L(3), 27-37.
• [11] Just, P. (2013). The impact of selected technological factors on spheroidization of cast iron obtaining by in mold method with use of lost foam process. Unpublished doctoral dissertation, Lodz University of Technology, Lodz.
• [12] Skarbiński, M. (1974). Start of production at the foundry. Warszawa: WNT.
• [13] PN-H-83105:1985P Castings. Classification and terminology of defects.