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All Journal Widyariset Jurnal Teknologi Bahan dan Barang Teknik Widyariset Metalurgi

Efendi Mabruri

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Author-ID : 1575451

Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics

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INVESTIGASI KOROSI BAJA TULANGAN BETON SIRIP DENGAN PROTEKSI KATODIK ARUS TANDING MENGGUNAKAN ANODA MMO-Ti MORTAR KONDUKTIF[Investigation Of Corrosion Of Reinforced Concrete With Impress Current Cathodic Protection Using Mmo-Ti Conductive Mortar Anode] M Syaiful Anwar; Arini Nikitasari; Efendi Mabruri; Sundjono Sundjono; Harsisto Harsisto
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

Studi Laju Korosi Baja Tahan Karat Martensitik 13CR Setelah Proses Perlakuan Panas [Effect of Heat Treatment of AISI 410 Martensitic Stainless Steel on Microstructure and Corrosion Resistance] Rizky Dwisaputro; Mochammad Syaiful Anwar; Rusnaldy Rusnaldy; Efendi Mabruri
Metalurgi Vol 33, No 1 (2018): Metalurgi Vol. 33 No. 1 April 2018
Publisher : National Research and Innovation Agency (BRIN)

Martensitic stainless steels are used in turbine blade materials in steam turbines of power plants. This study aims to determine the effect of heat treatment (austenitized and tempering) on microstructure and corrosion rate of AISI 410 martensitic stainless steel. The observation of microstructure was conducted using optical microscope and the corrosion test was performed in 3.5% NaCl solution which was carried out with Gamry G750 tool. The microstructure of AISI 410 steels after annealing process was composed of ferrite and metal carbide. The microstructure of martensite and retained austenite was obtained after the steel AISI 410 underwent a process of tempering at 600 °C with different austenitizing temperature. Meanwhile, the microstructure of temper martensite with retained austenite and metal carbide was found in AISI 410 steels after austenitized at 1050 °C with different tempering temperature. The corrosion rate of AISI 410 steels decreased with increasing austenitizing temperature. Meanwhile, very high corrosion current was found in AISI 410 steel at tempering of 550 °C and austenitized of 1050 °C. AbstrakBaja tahan karat martensitik telah digunakan pada material turbine blade pada turbin uap. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan panas quenching dan tempering terhadap struktur mikro dan laju korosi baja tahan karat martensitik AISI 410. Pengujian yang dilakukan adalah pengamatan struktur mikro menggunakan mikroskop optik dan uji korosi di dalam larutan 3,5% NaCl dengan alat Gamry G750. Struktur mikro baja AISI 410 setelah proses annealing adalah ferit dan karbida logam. Struktur mikro martensit dan austenit sisa dapat terbentuk bilamana baja AISI 410 telah mengalami proses tempering pada suhu 600 °C dengan suhu quenching yang berbeda. Sedangkan struktur mikro berupa tempermartensit dengan austenit sisa dan karbida logam ditemukan pada baja AISI 410 setelah quenching pada suhu 1050 °C dengan suhu tempering yang berbeda. Laju korosi baja AISI 410 semakin rendah seiring peningkatan suhu quenching. Sedangkan laju korosi sangat tinggi ditemukan pada baja AISI 410 pada suhu temper 550 oC dan quenching 1050 oC.

THE EFFECT OF ECAP PROCESSING TO HARDNESS, SURFACE MORPHOLOGI, AND CORROSION RESISTANCE OF 6061 ALUMINIUM ALLOYS Vinda Puspasari; I. Nyoman Gede P. A.; Efendi Mabruri; Satrio Herbirowo; Edy Priyanto Utomo
Metalurgi Vol 36, No 2 (2021): Metalurgi Vol. 36 No. 2 Agustus 2021
Publisher : National Research and Innovation Agency (BRIN)

Al-Mg-Si alloys (6xxx) has been widely used as structural materials in building and vehicles because of its excellent strength and corrosion resistance. The improvement of fine grain microstructure which can increase mechanical and physical properties become an interesting field in recent research.. Equal channel angular press is the most promising method to apply severe plastic deformation (SPD) which can produce ultra-fine grain in the bulk material without residual porosity. This study presents some experiments results on the effect of ECAP number of passes variation to the hardness, microstructure, and corrosion behaviour of Al 6061 alloys. The samples were annealed in the furnace with argon gas environment at 530°C for 4 hours and then immersed in liquid nitrogen for 5 minutes before ECAP process. The ECAP process was done with Bc route using dies with 120° of internal channel angle and pass variation of 1, 2, 3, and 4. The optimum hardness is 107.58 HRB in Al 6061 samples with 3 passes of ECAP. The increasing ECAP number of passes leads to a significant grain size reduction from 0 way pass, the grain size is around 10 µm, while for a 4 way pass, the grain size is around 2.5 µm. The corrosion resistance of Al 6061 alloys increased with the increasing number of passes in ECAP process.

GRAIN GROWTH KINETICS OF AUSTENITIC STAINLESS STEEL 316L AND THE RELATIONS BETWEEN GRAIN SIZES AND HARDNESS UNDER ISOTHERMAL CONDITIONS Moch. Syaiful Anwar; Mayang Gita Pradisti; Septian Adi Candra; Erie Martides; Efendi Mabruri; Eddy Sumarno Siradj
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

316L austenitic stainless steel was usually used in the nuclear power plant. This steel has an austenitic phase at room temperature, and it can change grain size after exposed at high temperatures. The purpose is to investigate grain growth behavior and hardness of 316L austenitic stainless steel after cold-rolled and annealing at a temperature of 1100 °C with holding times of 0, 900, 1800, 2700, 3600 s. The result shows that the grain growth of 316L austenitic stainless steel occurs normally. Austenite grain size of 316L increases with increasing holding time, resulting in hardness decreases. Grain growth of 316L austenitic stainless steel resulting from the experiment shows no difference significant with the prediction.

INTERDIFUSI EFEKTIF-FUNGSI KONSENTRASI DI DALAM PADUAN TERNER Ni-Re-X (X=Ru, Co)[Concentration-Dependent Effective Interdiffusion in Ni-Re-X (X=Ru, Co) Ternarry Alloys] Efendi Mabruri
Metalurgi Vol 28, No 2 (2013): Metalurgi Vol.28 No.2 Agustus 2013
Publisher : National Research and Innovation Agency (BRIN)

PENGARUH UNSUR KE-EMPAT TERHADAP TRANSFORMASI FASA DAN EFEK INGAT BENTUK (SHAPE MEMORY EFECT) PADUAN Ti- Ni-Cu[The Influence of Fourth Element on Phase Transformation and Shape Memory Effect (SME) of Ti-Ni-Cu Alloys] Efendi Mabruri; Bambang Sriyono; Bintang Adjiantoro; D N Adnyana
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : National Research and Innovation Agency (BRIN)

Fenomena Temper Embrittlement Pada Baja Martensitik AISI 410 Untuk Aplikasi Stem Gate Valve 20” Class 150 Grade WCB [Temper Embrittlement Phenomena of AISI 410 Martensitic Steel for Stem Gate Valve 20” Class 150 Grade WCB ] Galih Senopati; Cahya Sutowo; Efendi Mabruri
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : National Research and Innovation Agency (BRIN)

Temper embrittlement is a phenomenon that will decrease the toughness of steel due to tempering process at a certain temperature range. This phenomenon has been found in martensitic steel. This research is investigated the failure in stem gate valve of crude oil pipeline system. The stem gate valve material is made of stainless steel AISI 410. Several examinations were done to study cause of failure in stem gate valve such as visual inspection, chemical composition test using OES (optical emission spectrometer) and EDS (energy dispersive spectrometry), metallography observation by using optical microscopy (OM) and SEM (scanning electron microscopy), fractography using SEM, and Rockwell hardness test. Chemical composition test result on stem gate valve showed 13,65-13,67 wt.% Cr. The content of Cr in stem material is out from the required composition of AISI standard with the requirement of Cr amount 13,5 wt.%. Fractography result on the surface of failure stem area by SEM was observed intergranular crack followed by secondary crack. Its indicated that stem gate valve failure was caused by temper embrittlement due to tempering process.AbstrakTemper embrittlement merupakan fenomena penurunan kekuatan dari material baja yang disebabkan oleh proses tempering pada rentang temperatur tertentu. Beberapa kasus temper embrittlement ditemukan pada baja martensitik. Pada studi kali ini dilakukan pengamatan terhadap stem gate valve pada sistem perpipaan minyak mentah yang mengalami patah. Stem gate valve tersebut terbuat dari baja tahan karat martensitik tipe AISI 410. Kemudian dilakukan beberapa pengujian untuk mengetahui proses terjadinya patah pada stem gate valve yang meliputi pemeriksaan visual, analisa komposisi kimia dengan OES (optical emission spectrometer) dan EDS (energy dispersive spectrometry), pengamatan metalografi dengan OM (optical microscopy) dan SEM (scanning electron microscopy), fraktografi dengan SEM, serta uji keras Rockwell. Hasil pemeriksaan pada stem gate valve menunjukkan komposisi Cr adalah 13,65-13,67 % berat atau melebihi batas atas standar AISI 410 yaitu 13,5 %berat. Dari pengamatan struktur mikro diketahui material stem gate valve dalam kondisi telah dilakukan proses tempering dan teramati adanya secondary crack. Dari pengamatan fraktografi diketahui jenis retakan pada permukaan stem yang patah adalah retakan antar butir (intergranular crack) yang mengindikasikan terjadinya proses temper embrittlement pada saat proses tempering material stem gate valve.

PENGARUH SOLUTION ANNEALING DAN AGING PADA KAWAT PADUAN SHAPE MEMORY Ni-Ti DAN Ni-Ti-Cu[The Influence of Solution Annealing and Aging on Ni-Ti and Ni-Ti-Cu Shape Memory Alloy Wire] Efendi Mabruri; Bambang Sriyono; Bintang Adjiantoro; DN Adnyana
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

STUDI EQUAL CHANNEL ANGULAR PRESSING (ECAP) SUHU NITROGEN CAIR PADA PADUAN Al-Mg-Si (Al 6061) [A Study On Equal Channel Angular Pressing At Liquid Nitrogen Temperature Of Al – Mg – Si (Al 6061) Alloys] Efendi Mabruri; I Nyoman Gede; Edy Priyanto Utomo
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

Co-Authors Alfirano Alfirano Arini Nikitasari Arini Nikitasari Bambang Sriyono Bambang Sriyono Bintang Adjiantoro Bintang Adjiantoro Cahya Sutowo D N Adnyana DN Adnyana Eddy S Siradj Edy Priyanto Utomo Erie Martides Galih Senopati Harsisto Harsisto I Nyoman Gede I. Nyoman Gede P. A. Kevin kevin M Syaiful Anwar Mayang Gita Pradisti moch syaiful anwar Moch. Syaiful Anwar Mochammad Syaiful Anwar Rizky Dwisaputro Rusnaldy Rusnaldy Saefudin Saefudin Satrio Herbirowo Septian Adi Candra Sundjono Sundjono Vinda Puspasari

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