Penambahan Sr pada Aluminium Paduan A356 dengan Metode Lost Foam Casting (LFC)

Suherman Suherman, Sarjianto Sarjianto, Nisfan Bahri, Ali sai'in

Abstract


Pemilihan proses pengecoran dan laju pendinginan sangat menentukan morfologi partikel autektik silicon yang dihasilkan pada aluminium paduan. Proses pendinginan aluminium paduan dengan metode pengecoran metode Lost Foam Casting (LFC) berjalan sedikit lambat sehingga menghasilkan sifat mekanis yang rendah. Tujuan penelitian ini adalah untuk mempelajari pengaruh penambahan modifier Sr pada aluminium A356 pada struktur mikro dan sifat mekanis dengan metode LFC. Aluminium A356 ditambahkan kedalam logam cair sesaat sebelum dituangkan kepermukaan pola polystyrene yang telah dilapisi bahan refaktori. Penambahan modifier Sr dipelajari pengaruhnya terhadap perubahan struktru mikro dan sifat mekanis (kekerasan, kekuatan impak dan kekuatan tarik). Hasil penelitian ini menunjukkan terjadinya perubahan partikel autektik silicon dari bentuk acicular ke bentuk berserabut. Nilai kekerasan, kekuatan tarik maksimum dan kekuatan impak meningkat masing-masing sebesar 27%, 26% dan 22% setelah penambahan.

Keywords


Aluminium A356; modier Sr; LFC Casting

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References


“Surdia, T. dan Saito, S., 1992, ‘Pengetahuan Bahan Teknik’, P.T Pradnya Paramitha, Jakarta.

Suherman, 2019, Buku Pengecoran Logam (Metode Evaporative) - Deepublish | Penerbit Buku Deepublish.

S. Tabibian, E. Charkaluk, A. Constantinescu, A. Oudin, and F. Szmytka, “Behavior, damage and fatigue life assessment of lost foam casting aluminum alloys under thermo-mechanical fatigue conditions,” Procedia Eng., vol. 2, no. 1, pp. 1145–1154, Apr. 2010.

Wang, Q.G., Apelian, D., Lados, D.A., 2001, Fatigue behavior of A356/357 aluminum cast alloys. Part II – Effect of microstructural constituents.”

X. Cao and J. Campbell, “The nucleation of Fe-Rich phases on oxide films in Al-11.5Si-0.4Mg cast alloys,” Metall. Mater. Trans. A, vol. 34, no. 7, pp. 1409–1420, Jul. 2003.

Tabibian, S., Charkaluk, E., Constantinescu, A., Szmytka, F., Oudin, A. 2013, TMF–LCF life assessment of a Lost Foam Casting A319 aluminum alloy |

Buffière, J.-Y., Savelli, S., Jouneau, P.H., Maire, E., Fougères, R, 2001. Experimental study of porosity and its relation to fatigue mechanisms of model Al-Si7-MgO.3 cast Al alloys |

M. Uludağ, R. Çetin, D. Dispinar, and M. Tiryakioğlu, “The effects of degassing, grain refinement & Sr-addition on melt quality-hot tear sensitivity relationships in cast A380 aluminum alloy,” Eng. Fail. Anal., vol. 90, pp. 90–102, Aug. 2018.

S. Suherman, A. Syakura, A. Nasution, S. Mizhar, O. Hermawan, and A. Handoko, “Influence of Additional Sr and TiB on Aluminium Al-Si-Cu-Mg Alloys for Produced Prototype Cylinder Head Motorcycle,” Proceeding Ocean Mech. Aerosp.-Sci. Eng.-, vol. 5, no. 1, pp. 79–83, 2018.

G. Timelli, D. Caliari, and J. Rakhmonov, “Influence of Process Parameters and Sr Addition on the Microstructure and Casting Defects of LPDC A356 Alloy for Engine Blocks,” J. Mater. Sci. Technol., vol. 32, no. 6, pp. 515–523, Jun. 2016.

P. Tang, W. Li, Y. Zhao, K. Wang, W. Li, and F. Zhan, “Influence of strontium and lanthanum simultaneous addition on microstructure and mechanical properties of the secondary Al-Si-Cu-Fe alloy,” J. Rare Earths, vol. 35, no. 5, pp. 485–493, May 2017.

Q. Liu et al., “Effects of Sr, Ce and P on the microstructure and mechanical properties of rapidly solidified Al 7Si alloys,” Mater. Charact., vol. 140, pp. 290–298, Jun. 2018.

İ. Öztürk, G. Hapçı Ağaoğlu, E. Erzi, D. Dispinar, and G. Orhan, “Effects of strontium addition on the microstructure and corrosion behavior of A356 aluminum alloy,” J. Alloys Compd., vol. 763, pp. 384–391, Sep. 2018.

M. Faccoli, D. Dioni, S. Cecchel, G. Cornacchia, and A. Panvini, “Optimization of heat treatment of gravity cast Sr-modified B356 aluminum alloy,” Trans. Nonferrous Met. Soc. China, vol. 27, no. 8, pp. 1698–1706, Aug. 2017.




DOI: http://dx.doi.org/10.32497/jrm.v16i2.2615

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