Pengaruh Variasi Holding Time Dan Media Pendingin Step Quench Pada Proses Solution Treatment Paduan Cu-15,9Zn-6,89Al Terhadap Struktur Mikro Dan Kekerasan

Zain, Muhammad Farhan Ryamizard (2022) Pengaruh Variasi Holding Time Dan Media Pendingin Step Quench Pada Proses Solution Treatment Paduan Cu-15,9Zn-6,89Al Terhadap Struktur Mikro Dan Kekerasan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Shape memory alloy adalah grup material logam yang mampu untuk kembali kepada bentuk atau ukuran semula ketika dikenai prosedur pemanasan tertentu. Secara umum, material tersebut dapat dideformasi pada temperatur rendah dan ketika dikenai temperatur yang lebih tinggi akan kembali ke bentuk semula. Fenomena utama yang bertanggung jawab pada karakteristik shape memory alloy adalah perilaku termomekaniknya, yaitu pseudoelasticity dan shape memory effect (one/two way). Fenomena tersebut dipengaruhi oleh fasa austenit dan martensitnya. Paduan SMA yang digunakan dalam peneltian ini adalah Cu-15,9Zn-6,89Al yang didapat melalui proses pengecoran. Proses perlakuan panas yang dilakukan dalam penelitian ini adalah solution treatment dengan variasi holding time 10, 20, dan 30 menit, kemudian dilanjutkan dengan proses step quench dengan variasi media pendingin air dan oli. Pengujian yang dilakukan antara lain Optical Emission Spectroscopy (OES), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), metalografi, kekerasan, serta pengujian Shape Memory Effect (SME). Struktur mikro yang terbentuk pada seluruh spesimen adalah α, β, dan  tanpa adanya fasa β’ (martensit). Tidak terbentuknya β’ (martensit) dikarenakan temperatur martensite start (Ms) berada di bawah temperatur kamar. Ukuran butir terbesar pada spesimen solution treatment adalah 9.309 μm2 yang terdapat pada spesimen SQWB30 dan terkecil adalah 6.605 μm2 yang terdapat pada spesimen SQOB10. Hal tersebut terjadi dikarenakan semakin lama holding time pada proses solution treatment dan semakin lambat laju pendinginan yang digunakan, maka ukuran butir semakin besar. Sementara itu, spesimen as quench memiliki ukuran butir yang lebih besar dibandingkan dengan spesimen as cast akibat adanya proses annealing pada spesimen as quench. Semakin besar ukuran butir, maka nilai kekerasan dari spesimen semakin rendah. Nilai kekerasan terendah adalah 239,00 ± 1,63 HVN yang terdapat pada spesimen SQWB30 dan nilai kekerasan tertinggi adalah 290,67 ± 1,70 HVN yang terdapat pada spesimen as cast.
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Shape memory alloys are a group of metallic materials that are able to return to their original shape or size when subjected to certain heating procedures. In general, these materials can be deformed at low temperatures and when subjected to higher temperatures will return to their original shape. The main phenomenon responsible for the characteristics of shape memory alloy is its thermomechanical behavior, namely pseudoelasticity and shape memory effect (one/two way). This phenomenon is influenced by the austenite and martensite phases. The SMA alloy used in this research is Cu-15,9Zn-6,89Al obtained through the casting process. The heat treatment process carried out in this research is solution treatment with variations in holding time of 10, 20, and 30 minutes, followed by step-quench process with variations of cooling media water and oil. The tests carried out included Optical Emission Spectroscopy (OES), X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), metallography, hardness, and Shape Memory Effect (SME) testing. The microstructures formed in all specimens are α, β, and  without the presence of β' (martensite) phase. No formation of β'
(martensite) because the martensite start temperature (Ms) is below room temperature. The largest grain size in the solution treatment specimen was 9.309 m2 in the SQWB30 specimen and the smallest was 6.605 m2 in the SQOB10 specimen. This happens because the longer the holding time in the solution treatment process and the slower the cooling rate used, the larger the grain size. Meanwhile, the as quench specimen has a larger grain size than the as cast specimen due to the annealing process on the as quench specimen. The larger the grain size, the lower the hardness value of the specimen. The highest hardness value was 290.67 ± 1.70 HVN found in as cast specimens and the lowest hardness value was 239.00 ± 1.63 HVN found in SQWB30 specimens.

Item Type:	Thesis (Other)
Additional Information:	RSMt 671.36 Zai p-1 2022
Uncontrolled Keywords:	Shape memory alloy, Cu-Zn-Al, solution treatment, step-quench, struktur mikro, kekerasan, Shape memory alloy, Cu-Zn-Al, solution treatment, step-quench, microstructure, hardness
Subjects:	T Technology > TS Manufactures > TS205 Metals--Heat treatment.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	11 Feb 2025 01:16
Last Modified:	11 Feb 2025 01:16
URI:	http://repository.its.ac.id/id/eprint/118613

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