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Studi pengaruh kadar mangan dan temperatur austenisasi terhadap struktur mikro dan sifat mekanik baja mangan Fathan Bahfie; Zakhrofa Aleiya; Anistasia Milandia; Fajar Nurjaman
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (306.34 KB) | DOI: 10.29303/dtm.v10i1.317

Abstract

High manganese steel or austenitic manganese steelcommonly are used in mining industries such as thecomponent in an excavator, hammer mill, crusher, andjaw crusher plates. Those components are the alloy caststeel with containing manganese (Mn) about 11-18%.The mechanical properties of austenitic manganesesteel are depending on the amount of manganese andcarbon. The austenitic steel has three dominantproperties, i.e. high hardness; good wear resistance, andhigh impact resistance. The objectives of this researchare investigating the effect of the composition ofmanganese and the austenitization temperature on themicrostructure and mechanical properties of austeniticmanganese steel. Each variation of manganesecomposition was 5.87%. 9.42% and 15.28%. It washeated at 950, 1000 and 1050oC for 60 minutes and thenquenched with water. The result showed that the highesthardness was 46 HRC where the composition ofmanganese and the austenitization temperature was5.87%. and 1050oC. The lowest hardness number was16.3 HRC where the content of manganese and thetemperature was 9.42%. and 1050oC. The results agreedwith the microstructure of the increase in carbides andthe composition of manganese increased too. For thewear resistance properties, the optimum one was 6.78 x10-6 mm3/m at the composition of manganese andtemperature of 5.87% and 1050oC.
KARAKTERISTIK BAJA ST 41 HASIL PROSES HOT EQUAL CHANNEL ANGULAR PRESSING (HECAP) Slamet Wiyono; Anistasia Milandia; Muhammad Zaky Mubarok
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume II Nomor 1, April 2016
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (754.196 KB) | DOI: 10.36055/fwl.v0i1.722

Abstract

Proses ECAP merupakan salah satu proses perlakuan mekanik yang mampu menghasilkan butir material yang sangat halus (ultrafine grained). Baja karbon rendah dengan kandungan 0.16% C berdiameter 11mm dan panjang 65mm diberikan perlakuan mekanik melalui proses ECAP menggunakan cetakan yang memiliki sudut pada sisi dalam, θ = 1200 dan sudut sisi luar, Ψ = 70. Variabel prosesnya adalah jumlah laluan deformasi tanpa mengubah rute setiap laluannya. Dampak dari proses terhadap sampel ditinjau melalui uji kekerasan, densitas, porositas, dan metalografi. Sedangkan untuk mengetahui kekuatan sampel dilakukan dengan pendekatan persamaan Hall-Petch dimana besar butir yang terbentuk diukur menggunakan software Image-J. Hasil pengujian pada sampel menunjukkan adanya peningkatan densitas, penurunan porositas, dan penghalusan butir pada sisi sampel seiring peningkatan jumlal tahapan (laluan) deformasi yang menunjukan peningkatan kekuatan dari baja karbon rendah ST 41.