Pengaruh Kecepatan Pengadukan Proses Rheocasting terhadap Struktur Mikro dan Fluiditas Paduan Al-Cu

Muhammad Rezki Fitri Putra, Wahyono Suprapto, Achmad As’ad Sonief

Abstract


Rheocasting with the aim of developing and offering solutions to problems related to the casting process. Rheocasting is a casting process that utilizes solidification agitation to change the dendritic structure to non-dendrite (globular) by giving a variation of the stirring speed. Al-Cu is a metal material that has high strength-to-weight ratio characteristics from steel, good fatigue resistance, and heat-treatable. But fluidity is low, this triggers casting defects such as shrinkage and miss-run. The defect occurs because the cooling process of liquid metal is not uniform or there is gas trapped in molten metal. Defects in casting can significantly reduce material mechanical properties. The results show morphological changes in the dendrites to rosette to globular with increased stirring speed and grain diameter decreasing with increasing stirring speed. Increasing the stirring speed also produces a positive trend of the fluidity value of Al-Cu alloys in each mold thickness.


Keywords


Rheocasting; Al-Cu; Stirring Speed; Fluidity; Microstructure

Full Text:

PDF

References


ZHAO-HUA HU, XIANG PENG, GUO-HUA WU, DA-QIANG CHENG, WEN-CAI LIU, LIANG ZHANG, dan WEN-JIANG DING, “Microstructure Evolution And Mechanical Properties Of Rheo-Processed ADC12 Alloy,” Trans. Nonferrous Met. Soc. China (English Ed., Vol. 26, No. 12, Pp. 3070–3080, 2016.

A. POLA, M. TOCCi, dan P. KAPRANOS, “Microstructure And Properties Of Semi-Solid Aluminum Alloys: A Literature Review,” Metals (Basel)., Vol. 8, No. 3, P. 181, 2018.

A. M. AZIZ, M. Z. OMAR, dan M. S. SALLEH, “Evolusi Mikrostruktur Aloi A333 Melalui Proses Logam Separa Pepejal,” Sains Malaysiana, Vol. 45, No. 6, Pp. 977–987, 2016.

W. SUPRAPTO, Teknologi Pengecoran Logam. Malang: Ub Press, ISBN 978-602-432-289-2 2017.

B. RAHIMI, H. KHOSRAVI, dan M. HADDAD-SABZEVAR, “Microstructural Characteristics And Mechanical Properties Of Al-2024 Alloy Processed Via A Rheocasting Route,” Int. J. Miner. Metall. Mater., Vol. 22, No. 1, Pp. 59–67, 2015.

P. OSMOND, V. LE, F. MOREL, dan D. BELLETT, “Effect Of Porosity On The Fatigue Strength Of Cast Aluminium Alloys : From The Specimen To The Structure,” Procedia Eng., Vol. 213, No. 2017, Pp. 630–643, 2018.

K. YILDIRIM, M. HELVACI, Ö. G, E. ERZI, C. KAHRUMAN, dan D. DISPINAR, “Fluidity Characteristics Of A201 And A206 Al-Cu Alloy,” Arch. Foundry Eng., Vol. 18, No. 1, Pp. 135–138, 2018.

B. K. KANG dan I. SOHN, “Effects Of Cu And Si Contents On The Fluidity , Hot Tearing , And Mechanical Properties Of Al-Cu-Si Alloys,” Metall. Mater. Trans. A, 2018.

J. ZHANG dan Y. LI, “Effects Of Different Rotation Speeds On Microstructure , Hardness And Corrosion Resistance Of The Au-Cu Alloy,” Gold Bull. Springer, Vol. 50, No. 2, Pp. 137–145, 2017.

P. MELALI, P. ASHTIJOO, dan B. NIROUMAND, “Effect Of Stirring Speed And Flow Pattern On The Microstructure Of A Rheocast Al-Mg Alloy,” Assoc. Metall. Eng. Serbia Ames, Vol. Vol 21 (1), Pp. 35–43, 2015.

S. RASYID, E. ARIF, H. ARSYAD, dan M. SYAHID, “Effects Of Stirring Parameters On The Rheocast Microstructure And Mechanical Properties of Aluminum Alloy ADC12,” In Matec Web Of Conferences, 2018, Vol. 12004, Pp. 1–5.

R. GUPTA, A. SHARMA, U. PANDEL, dan L. RATKE, “Effect Of Stirring Speed On Microstructure Of A356 Alloy Cast Through Rheometal Process,” Int. J. Mater. Res. (Formerly Z. Met., Vol. 108, No. Table 1, Pp. 648–655, 2017.

ASTM INTERNATIONAL, “Standard Test Methods For Determining Average Grain Size,” 2014.

K. P. P. PANDEE dan S. B. C. LIMMANEEVICHITR, “Fluidity And Hot Cracking Susceptibility Of A356 Alloys With Sc Additions,” Trans. Indian Inst. Met., 2018.

B. ZHOU, Y. KANG, G. ZHU, J. GAO, M. QI, dan H. ZHANG, “Forced Convection Rheoforming Process For Preparation Of 7075 Aluminum Alloy Semisolid Slurry And Its Numerical Simulation,” Trans. Nonferrous Met. Soc. China, Vol. 24, No. 4, Pp. 1109–1116, 2014.

L. S. RAO, A. K. JHA, dan S. N. OJHA, “Tribology and Surface Topography Of Al-10cu-Fe Alloy Produced By Rheocasting Process,” India, 2017.

S. P. MIDSON, “Industrial Applications for Aluminum Semi-Solid Castings Industrial Applications For Aluminum Semi-Solid Castings,” Solid State Phenom., Vol. 217–218, Pp. 487–495, 2016.




DOI: https://doi.org/10.21776/ub.jrm.2019.010.03.6

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.