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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Jurnal Teknik Mesin Jurnal Sains dan Teknologi Jurnal Teknik Mesin Jurnal technoscientia Media Mesin: Majalah Teknik Mesin UNEJ e-Proceeding Majamecha JURNAL TEKNOLOGI TECHNOSCIENTIA Jurnal Teknik Mesin Jurnal Pengabdian Multidisiplin Indonesian Community Journal Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Ratna Kartikasari
Institut Teknologi Nasional Yogyakarta, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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STUDI PENGARUH TEMPERATUR TEMPER TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Fe-1,26Al-1,05C Kartikasari, Ratna
Media Mesin: Majalah Teknik Mesin Vol 10, No 1 (2009)
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Paduan Fe-Al-C merupakan paduan baru kandidat pengganti stainless steel konvensional, dimana unsur Al berperan menggantikan unsur mahal (Cr) pada stainless steel konvensional. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur temper terhadap sifat mekanik dan ketahanan korosi paduan Fe-1,26Al-1,05C. Bahan baku peleburan terdiri dari: scrap baja Mn rendah, Al murni dan Fe-C. Peleburan menggunakan dapur induksi frekwensi tinggi kapasitas 50 kg dengan alloying di dalam ladle. Austenitisasi sampai temperatur 900oC dilanjutkan dengan quenching dalam media air. Proses temper dilakukan pada temperatur 250oC, 300oC, 350oC, 400oC dan 450oC. Pengujian yang dilakukan adalah foto struktur mikro, pengujian tarik, pengujian kekerasan dan pengujian korosi dalam media 3,5% NaCl dengan metoda kehilangan berat. Hasil pengamatan struktur mikro menunjukkan bahwa paduan Fe1,26Al-1,05C as cast mempunyai struktur ferit dan perlit, kecenderungan pembentukan struktur ferit terjadi dengan semakin tinggi temperatur temper. Kekuatan tarik maksimum terjadi setelah hardening yaitu sebesar 82,7kg/mm2 dengan regangan tertinggi sebesar 47,2% setelah temper 450oC. Kekerasan tertinggi sebebesar 287,1 VHN terjadi setelah hardening. Hasil pengujian korosi menunjukkan bahwa laju korosi paduan 1,26Al-1,05C as cast akan menurun dengan semakin tinggi temperatur temper.
PENGARUH TEMPERATUR TEMPER TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Fe-1,52Al-1,44C Kartikasari, Ratna
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.701 KB) | DOI: 10.34151/technoscientia.v2i1.417

Abstract

On the basis of economic and lower density considerations, Fe-Al-C alloy could be a good candidate for replacing some of the conventional stainless steel. Wherein, Al is used to replace the expensive alloy element in conventional Fe-Cr-C system. The aim of the research is to investigate tempering temperature influence to mechanical properties and corrosion resistance of Fe-1,52Al-1,44C in the 3.5% NaCl solution. Fifty kilograms of Fe-Al-C were prepared from mild steel scrap, high purity aluminium, and Fe-C. The alloy was prepared in a high frequency induction furnace with alloying was done in the ladle. Optical microstructure, mechanical properties and corrosion rate were examined. The corrosion rate, were carried out with immersion methode in 3.5% NaCl. The optical micrograph shows that as cast Fe-1,52Al-1,44C alloy has ferrite and pearlite microstructure and has tendency to become ferritic microstructure with encreasing tempering temperature. Maximun tensile strength and maximum hardness took placed after hardening that was respectively 74,44kg/mm2 and 298,7 VHN. Maximum elongation was reached at 450oC tempering temperature. The result of corrosion testing showed that the alloy has decreasing corrosion rate with the increasing tempering temperature.
ANALISIS KERUSAKAN POROS BRINE INJECTION PUMP Kartikasari, Ratna; -, Antony
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 1 Agustus 2014
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (519.205 KB) | DOI: 10.34151/technoscientia.v7i1.610

Abstract

PT. Geo Dipa Energy Dieng unit is one form of industry exploiting geothermal steam(vapor) that uses abrine injection pump. Brine injection pump is a pump for injecting brine into injection wells. Pump using the VC type is the type of pump that has suction and discharge nozzle shead. The problems that always arise in the operation of the brine injection pump shaft is break age of component smade ​​of stainless steel SS420 in are latively short time. This study aims to determine the cause of brine injection pump shaft break age in avery short time.Stages of an alysis performe distesting the chemical composition using spectrometry and EDAX, macrophotoonfracturesurfaces, and microphoto on the area closest to the fracture surface using The results showed that the initial damage occurs precisely in the initial crack. Further more,the crack propagation occurs according to the loading pattern until the ductilet earing occurs before fracture. Generally, the pattern of fracture indicate sinter-crystalline pattern at the beginning of the trans-crystalline cracks and any subsequent stages until fracture occurs. SEMindicate the presence of Cr carbides with elongated patterns that indicatethe cause of fracture. This causes the carbide concentration are as vulnerable tocorrosiveenvironments, so that when the Cl-ions contained in the brine contactaggressively in this area then began collaborating between corrosion and dynamic load causes the initial crack and followed bycrack propagation that very fast into the brittle fracture pattern.
PENGARUH TEMPERATUR TEMPER TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Fe-1,52Al-1,44C Kartikasari, Ratna
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.417

Abstract

On the basis of economic and lower density considerations, Fe-Al-C alloy could be a good candidate for replacing some of the conventional stainless steel. Wherein, Al is used to replace the expensive alloy element in conventional Fe-Cr-C system. The aim of the research is to investigate tempering temperature influence to mechanical properties and corrosion resistance of Fe-1,52Al-1,44C in the 3.5% NaCl solution. Fifty kilograms of Fe-Al-C were prepared from mild steel scrap, high purity aluminium, and Fe-C. The alloy was prepared in a high frequency induction furnace with alloying was done in the ladle. Optical microstructure, mechanical properties and corrosion rate were examined. The corrosion rate, were carried out with immersion methode in 3.5% NaCl. The optical micrograph shows that as cast Fe-1,52Al-1,44C alloy has ferrite and pearlite microstructure and has tendency to become ferritic microstructure with encreasing tempering temperature. Maximun tensile strength and maximum hardness took placed after hardening that was respectively 74,44kg/mm2 and 298,7 VHN. Maximum elongation was reached at 450oC tempering temperature. The result of corrosion testing showed that the alloy has decreasing corrosion rate with the increasing tempering temperature.
ANALISIS KERUSAKAN POROS BRINE INJECTION PUMP Kartikasari, Ratna; -, Antony
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 1 Agustus 2014
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i1.610

Abstract

PT. Geo Dipa Energy Dieng unit is one form of industry exploiting geothermal steam(vapor) that uses abrine injection pump. Brine injection pump is a pump for injecting brine into injection wells. Pump using the VC type is the type of pump that has suction and discharge nozzle shead. The problems that always arise in the operation of the brine injection pump shaft is break age of component smade ​​of stainless steel SS420 in are latively short time. This study aims to determine the cause of brine injection pump shaft break age in avery short time.Stages of an alysis performe distesting the chemical composition using spectrometry and EDAX, macrophotoonfracturesurfaces, and microphoto on the area closest to the fracture surface using The results showed that the initial damage occurs precisely in the initial crack. Further more,the crack propagation occurs according to the loading pattern until the ductilet earing occurs before fracture. Generally, the pattern of fracture indicate sinter-crystalline pattern at the beginning of the trans-crystalline cracks and any subsequent stages until fracture occurs. SEMindicate the presence of Cr carbides with elongated patterns that indicatethe cause of fracture. This causes the carbide concentration are as vulnerable tocorrosiveenvironments, so that when the Cl-ions contained in the brine contactaggressively in this area then began collaborating between corrosion and dynamic load causes the initial crack and followed bycrack propagation that very fast into the brittle fracture pattern.
Karakterisasi Ball Mill Import pada Industri Semen di Indonesia Ratna Kartikasari; R. Soekrisno; M. Noer Ilman
Jurnal Teknik Mesin (Sinta 3) Vol. 9 No. 1 (2007): APRIL 2007
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

The purpose of this research is to investigate the characteristics of import Ball Mill which is used at cement mills in Indonesia. There were two kind of import Ball Mill from PT. Semen Gresik, Tbk that used in this research which are A type (Ø 30 mm) and B type (Ø 40 mm). Visual investigation, chemistry composition, distribution of hardness, and microstructure photograph was conducted characterize these ball mill. Visually, the import Ball Mill has rough surface, white coloring when cut off, and small cracks at all specimens. Type A ball mill contains of 2,934% C, 11,231% Cr, and 0,177% Mo, where type B Ball Mill contains of 2,693% C, 12,31% Cr, and 1,103% Mo. Both are martensitic white cast iron ASTM A532 Class II type A. The surface are harder then the its core. The highest hardness on the surface are 720,82 kg/mm2 (type A) and 746,5 kg/mm2 (type B), where as lowest hardness on the core are 631,1 kg/mm2 (type A) and 544,0 kg/mm2 (type B). Microstructure investigation shows Perlit, Cementit, and Martensit. Abstract in Bahasa Indonesia : Penelitian ini bertujuan untuk mengetahui karakteristik Ball Mill import yang digunakan oleh pabrik semen di Indonesia. Bahan yang digunakan adalah ball mill import di PT. Semen Gresik, Tbk dari 2 merk berbeda, yaitu merk A (f 30 mm) dan merk B (f 40 mm). Karakterisasi Ball Mill import dilakukan dengan pengamatan visual, uji komposisi kimia, uji distribusi kekerasan dan foto struktur mikro. Secara visual terlihat bahwa Ball Mill import memiliki permukaan kasar, hasil potongan berwarna keputihan dan terdapat retakan-retakan kecil pada semua specimen. Hasil uji komposisi kimia menunjukkan bahwa Ball Mill import f 30 mm mengandung 2,934% C, 11,231% Cr, dan 0,117% Mo sedangkan f 40 mm mengandung 2,693% C, 12,313% Cr dan 1,103 Mo, termasuk dalam kelompok Martensitic white cast iron ASTM A532 Class II Type A. Hasil uji distribusi kekerasan menunjukkan bagian permukaan lebih keras dibandingkan bagian pusat dengan nilai kekerasan tertinggi 720,82 kg/mm2 (f 30 mm) dan 746,5 kg/mm2 (f 40 mm) sedangkan nilai kekerasan terendah 631,1 kg/mm2 (f 30 mm) dan 544,0 kg/mm2 (f 40 mm). Hasil pengamatan foto struktur mikro menunjukkan bahwa struktur terdiri dari Perlit, Cementit dan Martensit. Kata kunci: ASTM A532, bola penggiling, besi tuang putih martensitik.
Modifikasi Sifat Mekanik dan Ketahanan Korosi Paduan Fe-1,52Al-1,44C dengan Proses Tempiring Ratna Kartikasari; Sutrisna Sutrisna; Suyitno Suyitno; Soekrisno Soekrisno
Jurnal Teknik Mesin (Sinta 3) Vol. 10 No. 2 (2008): OCTOBER 2008
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

Aluminum is third of biggest element in the world and cheaper relatively. The Fe-Cr-C alloy is promised alloy to replace the Fe-Cr-C alloy. The purpose of the research is to investigate influence of temperature to microstructure, tensile strength, hardness, and corrosion resistance of Fe-Al-C in the 3.5% NaCl solution. Raw material for casting is low Mn steel, FeMn HC, pure aluminum, slag remover. The melting used low frequency induction furnace which has 50 kg capacity. Hardening at 900oC, and then quenching in the water, the last temper along 1 hour with various temperature; 250oC, 300oC, 350oC, 400oC, 450oC and cooling in the air. Chemical composition, microstructure, tensile strength, hardness, and corrosion resistance of Fe-Al-C in the 3.5% NaCl solution were investigated. The result of the chemical composition investigation showed that Fe-Al-C alloy contained 1.52% Al, and 1.44% C. The microstructure of Fe-1.52 Al-1,44C alloy is ferrite and pearlite. The tensile strength of Fe-1.52 Al-1,44C alloy is 33.77 kg/mm2. The tensile strength raised after hardening process became 74.44 kg/mm2 and turn off again after tempering process. The Vickers hardness investigation showed that the Fe-1.52 Al-1,44C alloy has 232.4 VHN and raised after hardening became 298.7 VHN. Highest corrosion rate is 0,927 mm/year after hardening and lowest is 0.196 mm/year after tempering at 300oC (good category corrosion resistance). Abstract in Bahasa Indonesia: Aluminium merupakan unsur terbanyak ketiga di bumi yang harganya relatif murah. Paduan yang sangat menjanjikan untuk menggantikan Fe-Cr-C adalah Fe-Al-C. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur temper terhadap struktur mikro, kekuatan tarik, kekerasan, dan ketahanan korosi paduan Fe-1,52Al-1,44C dalam larutan 3,5% NaCl. Bahan baku peleburan yang digunakan adalah: Baja low Mn, FeMn HC, aluminium murni dan slag remover. Peleburan menggunakan dapur induksi frekwensi rendah kapasitas 50 kg. Hardening pada temperature 900oC, quenching dalam air, dan temper dengan variasi temperatur 250oC, 300oC, 350oC , 400oC, 450oC, selama 1 jam kemudian didinginkan di udara. Pengujian yang dilakukan adalah pengujian komposisi kimia, uji struktur mikro, uji tarik, uji kekerasan, dan pengujian korosi dalam media 3,5% NaCl. Hasil pengujian komposisi kimia menunjukkan bahwa paduan Fe-Al-C mengandung unsur Al sebesar 1,52% dan C sebesar 1,44%. Struktur mikro yang terbentuk dalam system paduan adalah ferit dan perlit dengan kekuatan tarik sebesar 33,77 kg/mm2. Terjadi peningkatan kekuatan tarik setelah proses hardening yaitu menjadi 74,44 kg/mm2 dan menurun kembali setelah proses temper, dengan kecenderungan semakin rendah dengan semakin tinggi temperatur temper. Nilai kekerasan sebesar 232,4 VHN, dan mengalami peningkatan pada proses hardening yaitu menjadi 298,7 VHN. Laju korosi paling tinggi terjadi setelah hardening yaitu 0,927 mm/th, dan laju korosi terendah terjadi setelah proses temper 300oC sebesar 0,196 mm/th, termasuk katagori baik. Kata kunci: Ferittic stainless steel, paduan Fe-1,52 Al-1,44C, hardening, quenching, temper.
PENGARUH VISKOSITAS MEDIA CELUP TERHADAP KEKERASAN DAN STRUKTUR MIKRO MARTENSITIC WHITE CAST IRON ASTM A532 Subardi Subardi; Ratna Kartikasari; Achmad Supiani
Jurnal Teknik Mesin (JTM) Vol 1, No 1 (2011)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Besi tuang putih memiliki keunggulan yaitu tahan aus, tahan korosi, kekuatan dan keuletan yang tinggi serta tahan terhadap perubahan suhu Besi tuang putih banyak digunakan pada industri pembuatan roda kereta api, rol untuk menggerus (grinding), dan plat penghancur batu. Kelemahan dari besi tuang putih tersebut adalah ketahanan terhadap keausan belum maksimal. Peningkatan ketahanan terhadap keausan salah satunya dengan proses heat treatment. Tujuan penelitian ini untuk mengetahui pengaruh viskositas pada media celup terhadap kekerasan dan struktur mikro besi tuang putih martensitik ASTM A532. Spesimen besi tuang putih martensitik ASTM A532 merck Cr 12, CR 17, CR 21 dengan ukuran 15 mm x 10 mm x 10 mm, selanjutnya dilakukan proses uji komposisi, heat teatment dengan suhu 900ºC ditahan 30 menit, lalu dicelupkan media oli dengan viskositas SAE 10, SAE 30, SAE 50. Pengujian meliputi uji kekerasan vickers dan pengamatan struktur mikro. Hasil pengujian komposisi kimia menunjukkan ASTM A532 CR12 mempunyai unsur C (carbon) sebesar 1.75% dan unsur Cr (Chromium) sebesar 14.24% masuk dalam kategori golongan besi tuang putih martensitik ASTM A532 Type A. ASTM A532, pada spesimen CR17 mempunyai unsur C (carbon) sebesar 2.15%, unsur Cr (Chromium) sebesar 17.90%, masuk golongan ASTM A532 Class II Type B. Dan Cr21 mempunyau unsur C (carbon) sebesar 3,15%, unsur Cr (chromium) sebesar 19,25% termasuk golongan ASTM A532 Type E. Hasil struktur mikro ASTM A532 terdiri dari struktur martensit, perlit dan Carbida Cr. Hasil pengujian kekerasan media quenching oli (SAE 10, SAE 30 dan SAE 50) untuk merck CR 12, CR 17, CR 21 nilai kekerasan berbeda jauh (signifikan). Kekerasan tertinggi dari ketiga merck besi tuang putih adalah CR 12 sebesar 1017,5 Kg/mm² pada quenching SAE 10, struktur martensit menjadi berkurang namun carbida Cr bertambah sehingga kekerasan menjadi tinggi. Dan kekerasan terendah pada CR 21 yaitu 600,1 Kg/mm² pada quenching SAE 50, pemanasan akan menurunkan jumlah martensit dan carbida sehingga kekerasan menurun.
STUDI PENGARUH TEMPERATUR TEMPER TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Fe-1,26Al-1,05C Ratna Kartikasari
Media Mesin: Majalah Teknik Mesin Vol 10, No 1 (2009)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v10i1.3188

Abstract

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF DISSIMILAR JOINT OF COLD ROLLED STEEL SHEETS 1.8 SPCC-SD AND NUT WELD M6 BY SPOT WELDING Ratna Kartikasari; Mustakim Mustakim; Joko Pitoyo; Feri Frandika
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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Abstract

Resistance spot welding is one of welding methods which is most widely used especially in the medical equipment industry. Unfortunately, interfacial fracture and pullout fracture often occur. The aim of this research is to find optimum current and time of resistance spot welding process for the best micro structure and mechanical properties. This research combined two spot welding parameters of cold rolled steel sheets1.8 SPCC-SD and nut weld M6: current (49, 52, 55, 58, 61 Ampere) and time (14, 17, 20, 23, 26 cycle). Optical microscopic, Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were used to examine weld zone, heat affected zone (HAZ) and parent metal microstructure. The mechanical properties were investigated using universal tensile test and Vickers micro hardness. It was found that the lowest current and cycle result incomplete joining, while the higher current and cycle increase tensile strength and hardness. The micro structures tend to be ferritic with acicular, grain boundary and widmanstaten ferrite on the weld zone for all parameters. The best microstructure and mechanical properties occur at 14 cycle and 61 A of parameters combination.
Co-Authors -, Antony -, Antony Achmad Supiani Achmad Supiani Achmad Supiani Angelio Fila Delfianto Maitano Anita Susiana Anshory, Shodiq Daru Sugati Feri Frandika Jeremia Yakin Berkat Zandroto Joko Pitoyo Kadiman, Sugiarto M. Noer Ilman Mahbubi, Khairul Muhammad Oky Sadewa Mus ta kim Mustakim Mustakim Mustakim Oktavianus, Yosep Oni Yuliani R. Soekrisno Sely Novita Sari Solikhah Retno Hidayati Subardi Subardi Subardi Sutrisna Sutrisna Suyitno Suyitno Teddy Marvin Silalahi Wartono Wartono Wijanarko, Yulius