Analisis Pengaruh Variasi Calcium Carbonate pada Baja AISI 1040 melalui Pack Carburizing dan Modified Martempering sebagai Material Alternatif Coal Crusher

Talytha, Bintang (2026) Analisis Pengaruh Variasi Calcium Carbonate pada Baja AISI 1040 melalui Pack Carburizing dan Modified Martempering sebagai Material Alternatif Coal Crusher. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pertambangan batu bara merupakan sektor strategis yang menuntut efisiensi tinggi pada setiap tahapan produksi. Salah satu tahapan penting adalah proses coal crushing menggunakan feeder breaker. Kinerja alat ini dipengaruhi oleh kondisi komponen teeth yang menerima beban kompresi, geser, dan impak secara langsung, sehingga memerlukan permukaan yang keras untuk menahan keausan serta inti yang tangguh agar tidak mudah patah. Material teeth yang digunakan saat ini adalah baja paduan DIN 90CrSi5, namun memiliki keterbatasan dari segi biaya dan ketersediaan. Oleh karena itu, penelitian ini bertujuan menganalisis pengaruh variasi energizer kalsium karbonat (CaCO₃) terhadap kekerasan dan struktur mikro baja AISI 1040 yang diproses melalui pack carburizing dan modified martempering sebagai material alternatif komponen teeth feeder breaker. Penelitian menggunakan baja AISI 1040 yang diberi perlakuan pack carburizing pada temperatur 900°C selama 180 menit dengan variasi CaCO₃ sebesar 10%, 15%, 20%, 25%, dan 30%, kemudian dilanjutkan dengan modified martempering pada 185°C selama 35 menit serta tempering pada 200°C selama 40 menit. Pengujian meliputi kekerasan Rockwell C (HRC), pengamatan struktur mikro secara optik, dan analisis fraksi fasa menggunakan perangkat lunak ImageJ. Hasil menunjukkan bahwa variasi CaCO₃ berpengaruh terhadap kekerasan dan struktur mikro baja AISI 1040. Nilai kekerasan meningkat dari 49,0 HRC pada variasi 10% menjadi 57,6 HRC pada variasi 20%, kemudian menurun pada variasi 25% dan 30%. Struktur mikro didominasi oleh martensit dan retained austenite. Variasi 20% CaCO₃ menghasilkan kondisi optimum dengan kandungan martensit sebesar 90,57% dan retained austenite sebesar 9,43%, serta memiliki nilai kekerasan tertinggi. Dibandingkan dengan material DIN 90CrSi5 yang memiliki kekerasan 48 HRC, baja AISI 1040 hasil perlakuan menunjukkan potensi yang layak dipertimbangkan sebagai material alternatif untuk komponen teeth feeder breaker.
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Coal mining is a strategic sector that requires high efficiency at every stage of the production process. One of the critical stages is the coal crushing process using a feeder breaker. The performance of this equipment is strongly influenced by the condition of the teeth component, which is subjected to compressive, shear, and impact loads. Therefore, the material must possess a hard surface to resist wear while maintaining a tough core to prevent fracture. Currently, the teeth component is made of DIN 90CrSi5 alloy steel; however, this material has limitations in terms of cost and availability. Therefore, this study aims to analyze the effect of calcium carbonate (CaCO₃) energizer variations on the hardness and microstructure of AISI 1040 steel processed through pack carburizing and modified martempering as an alternative material for feeder breaker teeth components. The study used AISI 1040 steel subjected to pack carburizing at 900°C for 180 minutes with CaCO₃ variations of 10%, 15%, 20%, 25%, and 30%, followed by modified martempering at 185°C for 35 minutes and tempering at 200°C for 40 minutes. The tests included Rockwell C hardness (HRC), optical microstructure observation, and phase fraction analysis using ImageJ software. The results indicate that CaCO₃ variation significantly affects the hardness and microstructure of AISI 1040 steel. Hardness increased from 49.0 HRC at 10% CaCO₃ to 57.6 HRC at 20% CaCO₃, then decreased at 25% and 30% CaCO₃. The microstructure was predominantly composed of martensite and retained austenite. The 20% CaCO₃ variation produced the optimum condition, containing 90.57% martensite and 9.43% retained austenite, resulting in the highest hardness value. Compared with DIN 90CrSi5 steel, which has a hardness of 48 HRC, the treated AISI 1040 steel demonstrates strong potential as an alternative material for feeder breaker teeth components.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kata Kunci: Coal crusher; baja AISI 1040; pack carburizing; calcium carbonate; modified martempering. Keywords: Coal crusher; AISI 1040 steel; pack carburizing; calcium carbonate; modified martempering.
Subjects:	Q Science > Q Science (General) Q Science > Q Science (General) > Q325.5 Machine learning. Support vector machines.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Bintang Talytha
Date Deposited:	06 Jul 2026 00:41
Last Modified:	06 Jul 2026 00:41
URI:	http://repository.its.ac.id/id/eprint/134292

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