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Apriardi Ihlas
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Computer Science & IT Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Analisis Kerusakan pada Rotor Turbin Uap Kapasitas 3191 KW Apriardi Ihlas
Jurnal Teknologi Bahan dan Barang Teknik Vol 6, No 2 (2016)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1402.797 KB) | DOI: 10.37209/jtbbt.v6i2.70

Abstract

The failure by corrosion of a 3191 KW steam turbine rotor was investigated. The corrosion has occurred on a steam turbine which results in lowering power capacity. A series of examinations were conducted including: visual examination, chemical composition, macro and micro examination, and Scanning Electron Microscopy/Energy Dispersive X-ray spectroscopy(SEM-EDS). Visual examination showed the location of corrosion tend to be more severe on the outer side. It has been found breakages in the form of a round shape holes. On the EDS examination, it was discovered that the element of silicon as a compiler of silica compounds, especially SiO2. A hard compound in the form of fine particles was suspected as the cause of damage through collision impact, which would be the initiation of further corrosion as pitting. Thus, the type of damage of this steam turbine's rotor, was the corrosion which caused by silica deposits carried away by the steam.Korosi pada turbin uap yang menyebabkan  penurunan kapasitas daya. Telah dievaluasi untuk mengetahui penyebab kerusakan agar kejadian serupa tidak berulang kembali. Untuk itu, dilakukan serangkaian pemeriksaan yang meliputi: pemeriksaan visual, komposisi kimia bahan, pemeriksaan makro dan mikro, dan juga Scanning Electron Microscopy/Energy Dispersive X-ray spectroscopy (SEM-EDS). Pemeriksaan visual menunjukkan lokasi korosi cenderung semakin parah pada radius terluar dekat sudu. Bentuk kerusakan berupa lubang-lubang yang berbentuk bulat.. Pemeriksaan EDS ditemukan unsur silikon sebagai penyusun senyawa silika, khususnya SiO2. Senyawa keras yang berbentuk partikel halus ini diduga sebagai penyebab kerusakan melalui benturan yang akan menjadi inisiasi korosi lanjutan sebagai korosi lubang. Jadi, tipe kerusakan pada rotor turbin uap ini adalah korosi yang diakibatkan oleh deposit silika yang terbawa oleh uap boiler.
Analisis Kerusakan Rel Kereta Api Angkutan Batubara Apriardi Ihlas
Jurnal Teknologi Bahan dan Barang Teknik Vol 7, No 1 (2017)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2359.882 KB) | DOI: 10.37209/jtbbt.v7i1.89

Abstract

The use of thermite welding technology on railway connection is the primary option due to its mobility and cost. There are many failures on railway used to transport large amount of coal. This study performed a series of examinations and tests to find the main cause of broken railway connections. Macro fractographic test showed chevron fracture pattern and ratchet mark as indication of crack initiation area, which was the centerline of welding area. Metallographic examination on crack initiation areas showed weak ferrite phase network with large perlite grains. It was also found a number of micro porosity which supported the result of fractographic examination. Micro fractographic examination by Scanning Electron Microscope (SEM) showed a typical brittle fracture and a lot of micro porosity. Chemical composition examination by Energy Dispersive Spectrometer (EDS) showed an alumina inclusion slag. Therefore, low quality of thermite welding connection was caused by initial crack from the inside in the form of micro porosity in the centerline of welding area.Penggunaan teknologi pengelasan termit pada sambungan rel kereta api menjadi pilihan utama karena mobilitas dan biayanya. Kerusakan telah terjadi pada sambungan rel kereta api yang digunakan sebagai angkutan batu bara dalam jumlah yang banyak. Pada penelitian ini akan dilakukan serangkaian pemeriksaan dan pengujian untuk mencari penyebab utama patahnya sambungan rel tersebut. Berdasarkan pemeriksaan fraktografi secara makro memperlihatkan pola patahan chevron dan ratchet mark sebagai petunjuk daerah awal retakan, yaitu centerline daerah las. Hasil pemeriksaan metalografi pada daerah inisiasi retakan menunjukkan terbentuknya jaringan fasa ferit yang lemah dengan ukuran butir perlit yang besar. Selain itu ditemukan sejumlah porositas mikro yang mendukung hasil pemeriksaan fraktografi. Hasil pemeriksaan fraktografi secara mikro dengan Scanning Electron Microscope (SEM) memperlihatkan tipikal patahan getas dan ditemukan  banyak porositas mikro. Dari pemeriksaan komposisi kimia dengan Energy Dispersive Spectrometer (EDS) ditemukan slag inklusi tipe alumina. Dengan demikian, rendahnya kualitas sambungan las termit diakibatkan oleh terbentuknya retakan awal dari dalam berupa porositas mikro pada centerline daerah las.
FAILURE ANALYSIS OF PRESTRESSED CONCRETE STEEL BAR DURING THE INITIAL DRAWING PROCESS Toni Agung Priambodo; Apriardi Ihlas
Jurnal Teknologi Bahan dan Barang Teknik Vol 11, No 2 (2021)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v12i2.277

Abstract

Reinforced concrete is a common structural material used in the modern era. High tension steel provides strength to the concrete structure to reduce internal tensile forces and eliminate cracking. Failure of reinforcing steel causes the reinforced concrete to not have optimal strength and has the potential to cause failure in the main structure. The present paper describes the investigation of the failure case in the prestressed concrete bar (PC bar) during the manufacture of prestressed or pre-tensioned concrete. The failure occurred in the head section area during the initial drawing process. The chemical composition and tensile test showed the raw material complied to the manufacturer's specification. The fractography and microscopic examination of the failure area showed the characteristics of brittle fracture. Stress concentration in the head section and the tempering process of PC bar after quenching process at an inappropriate temperature caused temper embrittlement to be the cause of failure during the initial drawing process.
Co-Authors Toni Agung Priambodo