Analisis Pengaruh Variasi Holding Time Annealing Dengan Step Quench Terhadap Struktur Mikro Dan Kekerasan Pada Paduan Cu-16,8Zn-6,99Al

Zainuddin, Ezra Elkaar (2022) Analisis Pengaruh Variasi Holding Time Annealing Dengan Step Quench Terhadap Struktur Mikro Dan Kekerasan Pada Paduan Cu-16,8Zn-6,99Al. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Paduan Cu-Zn-Al merupakan paduan berbasis Cu dimana memiliki komposisi unsur Zn 16-30%, Al 4-8%, dan Cu balance. Paduan Cu-Zn-Al merupakan alternatif dari paduan Ni-Ti karena memiliki karakteristik yang serupa namun dengan sifat mekanik ang berbeda. Sehingga pada penelitian ini digunakan paduan Cu-Zn-Al untuk melakukan analisis pada holding timeproses annealing dan media pendingin pada solution treatment untuk mengetahui struktur mikro dan kekerasan. Perlakuan panas ang diberikan berupa homogenizing, annealing, dan solution treatment dengan metode step quench. Variasi holding time yang digunakan pada proses annealing yaitu 1, 2, 3, dan 4 jam; media pendingin yang digunakan pada metode step quench adalah air dan oli. Pengujian yang dilakukan pada penelitian ini, yaitu pengujian Optical Emission Spectroscopy (OES), X-Ray Diffraction (XRD), metalografi, kekerasan, dan Differential Scanning Calorimetry (DSC). Hasil pengujian metalografi didapatkan fasa α, β, γ, dan tidak terbentuk fasa β’(twinned martensite). Hal ini terjadi karena temperatur martensite start (Ms) berada di temperatur ~(-155,826)℃. Selain itu, didapatkan pula nilai rata-rata diameter ukuran butir terbesar pada spesimen AN4 sebesar 181,404 μm dan terkecil pada spesimen SQA1 sebesar 103,911 μm. Hasil pengujian kekerasan didapatkan nilai kekerasan terbesar pada spesimen SQA1 sebesar 286 ± 1 HV dan terkecil pada spesimen AN4 sebesar 240 ± 4,582 HV. Hal tersebut terjadi karena semakin lama holding time perlakuan panas annealing,maka semakin besar butir yang terbentuk pada struktur mikro dan semakin kecil nilai kekerasan.Selain itu, hasil yang sama juga akan didapatkan ketika media pendingin pada proses step quench memiliki cooling rate yang rendah.
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The Cu-Zn-Al alloy is a Cu-based alloy which has an elemental composition of 16-30% Zn, 4-8% Al, and Cu balance. Cu-Zn-Al alloy is an alternative to Ni-Ti alloy because it has similar characteristics but different mechanical properties. So in this study, Cu-Zn-Al alloy was used to analyze the holding time of the annealing process and the cooling medium in the solution treatment to determine the microstructure and hardness. Heat treatment is given in the form of homogenizing, annealing, and solution treatment with the step quench method. Variations of holding time used in the annealing process are 1, 2, 3, and 4 hours; The cooling medium used in the step quench method is water and oil. The tests carried out in this study were Optical Emission Spectroscopy (OES), X-Ray Diffraction (XRD), metallography, hardness, and Differential Scanning Calorimetry (DSC). The metallographic test results obtained α, β, γphases, and no γ' (twinned martensite) phase was formed. This happens because the marensite start temperature (Ms) is at a temperature of ~(-155.826)℃. In addition, the average diameter of the largest grain size in the AN4 specimen was 181.404 μm and the smallest in the SQA1 specimen was 103.911 μm. The results of the hardness test showed that the highest hardness value for the SQA1 specimen was 286 ± 1 HV and the smallest for the AN4 specimen was 240 ± 4.582 HV. This happens because the longer the holding time of the annealing heat treatment, the larger the grains formed in the microstructure and the smaller the hardness value. In addition, the same results will also be obtained when the cooling medium in the step quench process has a low cooling rate.

Item Type:	Thesis (Other)
Additional Information:	RSMt 671.36 Zai a-1 2022
Uncontrolled Keywords:	Annealing, Paduan Cu-Zn-Al, Media Pendingin, Step Quench, Annealing, Cu-Zn-Al Alloy, Step Quench, Quenchant Media
Subjects:	T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	23 Dec 2024 03:10
Last Modified:	23 Dec 2024 03:10
URI:	http://repository.its.ac.id/id/eprint/116028

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