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Bambang Widyanto
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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PENGARUH WAKTU AUSTENITISASI PADA PROSES PELARUTAN KARBIDA BAJA MANGAN AUSTENITIK Bambang Widyanto; Achmad Sambas
Mesin Vol. 22 No. 1 (2007)
Publisher : Mesin

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Abstract

Austenitic manganese steel is used for components which need good wear resistance and impact resistance. The application examples of austenitic manganese steel castings are in the mining industries such as rock crusher and dredge buckets, and in transportation industry, this material was used in railroad track work such as frog. However as-cast austenitic manganese steel is brittle with low toughness due to the presence of carbides. Hence, the as-cast austenitic manganese steel should be solution treated to dissolve the carbides into austenite phase, to improve its mechanical properties. Additionally, this research is enriched by using thickness parameter, to understand the influence of the dimension. The chemical composition in the casting process is in accordance with ASTM A 128 grade A. The solution treatment processes was done using a step heating procedure at temperature 575oC and 1050oC and determined heating time. Heating temperatures were determined based on Fe-Mn-C phase diagram and by the previous researches. Holding time was determined based on the literature, and heat transfer simulation result. The effects of the solution treatment were observed in the microstructure, grain size, and hardness of the specimens to obtain the optimal solution treatment that can be used. The objective of this research is to find the suitable heat treatment method in order to produce the desirable material properties and in this case, 160HB was obtained.
ANALISA KOROSI MATERIAL PADA PROSES HYDROTREATING POLY FATTY ACID DESTILLATE Mukhlis Mukhlis; Bambang Widyanto
Jurnal Teknologi Maritim Vol 1 No 1 (2018): Jurnal Teknologi Maritim
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) - PPNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/jtm.v1i1.424

Abstract

Kajian ini bermaksud untuk menentukan material yang tahan korosi untuk peralatan proses hydrotreating Poly Fatty Acid Distillate (PFAD). Pengujian korosi ini dilakukan terhadap baja tahan karat feritik dan austenik dengan metode imersi dalam autoclave. Hasil pengujiaa ini untuk melengkapi pengujian yang sama yang telah dilakukan pada material baja karbon, baja krom-moly dan baja tahan karat martensitic. Autoclave dioperasikan pada tekanan sekitar 15,7÷ 29,42 bar, temperatur 140 ÷ 300°C, kadar TAN 45 ÷ 169,19 mg KOH/ml per sampel minyak dan kadar air 0 ÷ 17% volume. Kemudian, karakterisasi material dan media digunakan FTIR-GCMS, mikroskop cahaya, scanning electron microscope, dan uji kehilangan berat material. Dari hasil FTIR-GCMS diketahui adanya agen korosi berupa asam karboksilat, namun belum dapat dipastikan secara signifikan bahwa asam tersebut adalah asam naftanik. Sementara itu, hasil pengamatan dengan mikroskop cahaya dan SEM terlihat profil permukaan material yang terkorosi. Ketika uji imersi dilakukan pada temperatur 300°C, tekanan 29,42s/d 34,3, kadar air 17% volume and nilai TAN 169,19 mg KOH / gr sampel minyak, terlihat bahwa temperature dan nilai TAN berpengaruh signifikan terhadap laju korosi. Setelah membandingkan hasil penelitian ini dan sebelumnya, baja tahan karat austenik memilik ketahanan korosi yang baik pada proses hydro-treating media yang mengandung Poly Fatty Acid Distillate (PFAD).
Co-Authors Achmad Sambas Mukhlis Mukhlis