Analisa Mikrografi dan Sifat Mekanis Pada Produk Pengecoran Bahan Baku Piston Panther

The automotive technology is growing rapidly, so that there must be the available materialwith high hardness, light in weight, and low cast. Piston is one of engine component for vihecle machine power transformed to move crank shaft and other component of carriage wheel. The aim of the research was to analyze the chemical composition, micro structure and mechanical properties of piston. So material examinations have been done include is spectrometric test to know about composition, rockwell hardness test to measure hardness, micrographic test for observing microstructure, and tensile test for tensile strength analysis. The result of research showed that material according to JIS ADC 12, aluminum alloy material with the main elements Si, Cu, Zn, Fe. Maximum hardness was measured at the head of material of 62 HRB and it’s still in range of acceptance criteria. The ultimate tensile strength and still in range of JIS ADC 12 criteria, which is 177,53 Mpa. Test results show that with the higher austempering temperature range has resulted in the higher hardness value

STUDI KARAKTERISTIK MATERIAL PISTON DAN PENGEMBANGAN PROTOTIPE PISTON BERBASIS LIMBAH PISTON BEKAS

The problems faced by entrepreneurs in the field of transportation at this time is a problem the availability of spare parts and spare parts at high cost. Engine prime can be maintained if, is coupled with maintenance and replacement of spare parts on regular basis or the improper use. Based on the problem, research on the field of innovation spare parts for quality mass transportation, reliable and inexpensive need developing. One problem is the wear of piston causing damage. To reduce consumption of aluminum need to require recycling of aluminum. In this research the focus of the problems is to study about the material characterization of piston and piston prototype development based waste Piston. The experiment was conducted on the pouring temperature variations of 700, 750, 800oC, the piston alloy compositions are: 75% waste piston + 25% ADC 12, 50% waste piston + 50% ADC 12, 25% waste piston + 75% ADC 12 and as a control waste piston pure and ADC 12 pure. Material characterization of the piston prototype was conducted including the chemical composition, microstructure, hardness, porosity and roughness. The results of prototype material and development of piston prototype based waste piston shows best with 64.5 HRB hardness, low porosity 4.613 and roughness before machining is the product 1.58 achieved of the composition of 25% waste piston + 75% ADC 12 with the pouring temperature of 700oC

Material Strength Analysis on Track Shoe Excavator Using Abrasive Wear Testing Using Pin-on-Disk Method

Undercarriage excavator costs a lot for the maintenance and repair of the overall cost of excavator maintenance and repair. One part of the undercarriage excavator that mostly requires maintenance is the track shoe. Track shoe is the crawler or outer wheel of excavator that serves as an excavator drive. This part is always in direct contact with the soil resulting wear and tear. This research discussed the comparison of track shoe material from the market products and the material that had already been quenching with the medium of water. The material in use was AISI 1526. The analyzing processes used micrography testing, hardness testing, wear and tear testing and corrosion testing. Examination of the microstructure of the sample was conducted using optical microscope, the hardness sample testing was conducted using rockweld hardness tester, wear and tear testing was conducted using pin-on-disk method, and corrosion testing was conducted using potentiodynamic polarization method. From the analysis results, the hardness value for the market product material was 41 HRC and the heat treatment material was 48.33 HRC. The rate of wear and tear for the market product material was 4.02x10-5 mm3/mm and the heat treatment material was 3.30x10-5 mm3/mm. The result of corrosion testing for the market product material was 0.52  and the heat treatment material was 0.38 . From the testing results, the hardness value was inversely proportional to the wear and tear and corrosion value; the harder the material, the less the rate of wear and tear. Keywords: AISI 1526, track shoe, excavator, micro structure, wear and tear testing, hardness testing, corrosion testing, pin-on-disk, potentiodynamic polarizatio

Analisis Korosi Dan Erosi Di Dalam Pipa Pdam Semarang

Korosi erosi merupakan salah satu kerusakan yang sering terjadi pada sistem perpipaan akibat adanya pergerakan relatif fluida korosif dengan permukaan logam. Kecepatan fluida yang relatif tinggi dan mengandung partikel akan menyebabkan erosi, dan kecepatan fluida yang relatif lambat akan menimbulkan korosi. Hanya pada kecepatan tertentu (kecepatan kritis) korosi erosi dapat terjadi. Laju kerusakan yang diakibatkan oleh sinergi antara korosi dan erosi lebih besar dibandingkan dengan kerusakan oleh korosi saja atau erosi saja. Dalam tugas akhir ini dimaksudkan untuk memahami fenomena korosi erosi secara teoritis yang terjadi pada material pipa PDAM Semarang. Kondisi korosif yang terjadi akibat aliran air minum yang terus mengalir di dalam pipa tersebut. Dari hasil yang diperoleh dari pengujian komposisi menunjukkan material pipa yang digunakan dalam pipa PDAM Semarang mengandung unsur karbon C sebesar 0,0711% maka dapat dikategorikan kedalam besi karbon rendah. Pada pengujian tarik di dapat hasil Untuk pipa korosi mengalami regangan sebesar 4,706% dan mengalami patah pada Fmax sebesar 13 KN sedangkan pada pipa baru mengalami regangan sebesar 5,882% dan mengalani patah pada Fmax sebesar 20 KN. Pada uji struktur mikro didapatkan ukuran butir pada pipa baru sebesar 26,6 μm sedangkan pada pipa korosi sebesar 26,1 μm. Untuk perhitungan laju korosi pada material pipa tersebut selama 1 tahun sebesar 1,681 mpy dan kehilangan berat spesimen pipa sebesar 8,44 gram terjadi akibat korosi yang terjadi pada material baja karbo

Analisis Korosi Dan Kerak Pipa Nickel Alloy N06025 Pada Waste Heat Boiler

Corrosion is destruction process of metal surfaces by chemical reaction from its environment. One of example is corosive media for ferrule pipe due to high temprature. The rate of corrosion is accelerated by the existance of leaks in the water feed tube. Corrosion testing on corroded ferrule pipe specimens is using SEM, EDX, and XRD examination. High temperature corrosion exist due to chloride penetration of boiler tube leak. In addition, the temperature during the test is also one factor of corrosion. Plumbing materials is damaged by high temperature corrosion. Ferrule pipe seems to increase the thickness of pipe due to the crust and thin oxidation layer. The reason of high temperature corrosion due to an oxide layer. The oxide layer able to resist attack of another corrosion if amount of oxygen in their environment is sufficient.By using the reference, there is a white crust and increased thickness of the pipe. The pipe ferrule having obtained corrosion, crust generated from the boiler tube. SEM of the test results shows that the addition of the pipe thickness due to crustal and XRD test results are minerals that cause the crust