Analisis Kegagalan Hasil Uji Produk Pelek Aluminium Berdasarkan SNI 1896 : 2008

Apriardi Ihlas, Najmuddin Yahya

Abstract


The aluminium wheel rim product is one of the mandatory SNI products. The wheel rim product is directly related to the safety of the wearers. Some domestic industries have failed to meet the requirements of the SNI 1896: 2008, especially in testing the resistance for impact loads. The purpose of this research was to discover the causes of that failure. Several methods were carried out to find out the causes, namely the metallographic examination, the Scanning    Electron Microscopy/Energy   Dispersive   X-Ray   Spectroscopy (SEM/EDS), and the chemical composition. All data would be compared with Original Equipment Manufacturer (OEM) products. The results of the research proved that the too-high Fe content would form a needle structure which had a low interface bond to the aluminium matrix. This condition simplified the spreading of cracks. Based on the results of the chemical composition test and the Al-Si-Fe phase diagram, the intermetallic phase formed was β-AlFeSi, presumably. Also, two types of defect were found, interdendritic shrinkage and less gas porosity with the uneven distribution. The sharp form of the shrinkage defect and β-AlFeSi phase caused the stress concentration would become the initial crack. Consequently, all these conditions caused the low durability of the wheel rim product for the impact loads

Keywords


aluminium, wheel rim, intermetallic phase, needle structure

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References


Alberto J, Teno S. Removal of iron from molten recycled aluminium through intermediate phase filtration. Materials Transactions 2006; 47(7): 1731–1736.

ASTM B 179 – 03. Standard specification for aluminium alloys in ingot and molten forms for castings from all casting processes.

Damoah L. Removal of iron from aluminium : A review mineral processing and extractive removal of iron from aluminium : A Review. Mineral Processing & Extractive Metall. Rev 2012; 33: 99–157.

Darvishi A. The mutual effect of iron and manganese on microstructure and mechanical properties of aluminium-silicon alloy. MJoM 2010; 16 (1): 11-24.

Fiorese EF, Bonollo G, Timelli L, Arnberg, Gariboldi E. New classification of defects and imperfections for aluminium alloy castings. Int. J. Met 2015; 9 (1): 55–66.

Khalifa W, Samuel FH, Gruzleski JE. Iron intermetallic phases in the al corner of the Al-Si-Fe system. Metallurgical and Materials Transactions A 2003; 34: 807–825.

Lee PDP, Li DM, Maijer TC, Lindley, Lee PD. Simulating the residual stress in an a356 automotive wheel and its impact on fatigue life. Metallurgical and Materials Transactions B. 2007; 38B: 505–515.

Lu L, Dahle AK. Iron-rich intermetallic phases and their role in casting defect formation in hypoeutectic Al-Si alloys. Metallurgical and Materials Transactions A. 2005; 36A: 819–835.

Mbuya TO, Odera BO, Ng’ang’a PS. Influence of iron on castability and properties of aluminium silicon alloys: literature review. International Journal of Cast Metals Research 2003; 16: 451–465.

Navyanth K, Minimization of defects in aluminium alloy castings using SQC. Department of Mechanical Engineering National Institute of Technology Rourkela India, PhD thesis, 2013.

SNI 1896 : 2008, Pelek Kendaraan Bermotor Kategori M, N, dan O.


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