AMARIY, YUDITIRA (2023) STUDI PENGARUH TEMPERATUR DAN WAKTU PEMANASAN TERHADAP KINETIKA PERTUMBUHAN BUTIR DAN SIFAT MEKANIK BAJA KARBON RENDAH PADA SIMULASI PROSES CONTINOUS ANNEALING LINE (CAL). S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
The steel industry is a strategic industry that plays an important role as a provider of raw materials for industries, both the automotive industry, the defense industry, for infrastructure, to household appliances. One of the applications of cold rolled steel sheet is in the automotive sector where the industry requires steel raw materials that have ductile properties, good formability properties, even equivalent to EDDQ (Extra Deep Drawing Quality) quality. Continuous annealing is done to reduce the mechanical properties and increase the ductility properties of the material. The mechanical properties of the material are affected by the grain size, therefore it is necessary to increase the grain size to obtain the appropriate mechanical properties. This study aims to determine the effect of temperature and heating time on the grain growth kinetics and mechanical properties of low carbon steel in the continuous annealing line (CAL) process. In this study using cold rolled steel with a thickness of 1 mm, prior to being given the continuous annealing treatment, the initial characterization was carried out first. The continuous annealing process used annealing temperatures of 550⁰C, 575⁰C, and 600⁰C, and holding times of 0.03 ks, 5.4 ks, 7.2 ks, 9 ks, and 10.8 ks. Then after being treated, metallographic observations, tensile testing, and hardness testing were carried out on the samples after continuous annealing. The results obtained include the formation of an equiaxial ferrite phase, the higher the temperature and annealing time, the larger the grain size, and the decreasing mechanical properties. The highest average grain size in this study was produced at a temperature of 600⁰C with a holding time of 10.8 ks of 53.64 µm. And the best mechanical properties in this study were produced at a temperature of 600⁰C with a holding time of 10.8 ks which resulted in the lowest yield strength value of 177.11 MPa, and produced the lowest hardness value of 84.6 HV.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Industri baja merupakan industri strategis yang berperan penting sebagai penyedia bahan baku bagi industri-industri baik industri otomotif, industri pertahanan, untuk infrastruktur, hingga peralatan rumah tangga. Salah satu aplikasi baja lembaran canai dingin dalam bidang otomotif dimana dalam industri tersebut membutuhkan bahan baku baja yang memiliki sifat ulet, sifat mampu bentuk yang baik, bahkan setara dengan kualitas EDDQ (Extra Deep Drawing Quality). Continous annealing dilakukan untuk menurunkan sifat mekanik, dan meningkatkan sifat keuletan pada material. Sifat mekanik material dipengaruhi oleh ukuran butir, maka dari itu perlu dilakukan peningkatan ukuran butir untuk mendapatkan sifat mekanik yang sesuai. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur dan waktu pemanasan terhadap kinetika pertumbuhan butir dan sifat mekanik baja karbon rendah pada proses continous annealing line (CAL). Dalam penelitian ini menggunakan baja canai dingin dengan tebal 1 mm, sebelum diberi perlakuan continous annealing sampel dilakukan karakterisasi awal terlebih dahulu. Pada proses continous annealing menggunakan temperatur annealing 550⁰C, 575⁰C, dan 600⁰C, serta waktu tahan 0,03 ks, 5,4 ks, 7,2 ks, 9 ks, dan 10,8 ks. Kemudian setelah diberi perlakuan dilakukan pengamatan metalografi, pengujian tarik, dan pengujian kekerasan terhadap sampel setelah continous annealing. Hasil yang didapat antara lain seperti terbentuknya fasa ferit equiaxial, semakin tinggi temperatur dan waktu annealing maka ukuran butir semakin besar, dan sifat mekanik semakin menurun. Adapun ukuran butir rata-rata paling tinggi pada penelitian ini dihasilkan pada temperatur 600⁰C dengan waktu tahan 10,8 ks sebesar 53,64 µm. Dan sifat mekanik terbaik pada penelitian ini dihasilkan pada temperatur 600⁰C dengan waktu tahan 10,8 ks yang menghasilkan nilai yield strength terendah yaitu sebesar 177,11 MPa, dan menghasilkan nilai kekerasan terendah yaitu 84,6 HV. | |||||||||
| Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TS Manufactures |
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| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mr Yuditira Amariy | |||||||||
| Date Deposited: | 27 Feb 2023 09:43 | |||||||||
| Last Modified: | 27 Feb 2023 09:43 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/21955 |
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