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Potensi dan Karakterisasi Limbah Metalurgi â€œSlag Nikel Pig Ironâ€ Atik Setyani; Yasmina Amalia; Hendy Roesma Wardhana
Journal of Metallurgical Engineering and Processing Technology Vol 3, No 2 (February 2023)
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v3i2.8579

Pada beberapa tahun terakhir, pertumbuhan industri pengolahan material non fero seperti nikel, alumumium maupun tembaga berkembang sangat pesat. Hal ini secara tidak langsung berdampak terhadap peningkatan limbah metalurgi hasil pengolahan material tersebut. Di Indonesia, slag pengolahan logam diantarannya slag Nikel Pic Iron (NPI) merupakan salah satu limbah yang belum digunakan secara optimal. Disisi lain slag NPI diketahui mengandung unsur-unsur seperti Pb, Zn, As, Cd dan Co yang berpotensi mencemari lingkungan dan membahayakan manusia. Upaya pemanfaatan slag NPI menjadi produk yang lebih bernilai sangat penting dilakukan untuk meningkatkan nilai ekonomi dari limbah metalurgi dan meminimalisir pencemaran lingkungan. Oleh karena itu, pada penelitian ini telah dilakukan karakterisasi slag NPI yang berpotensi untuk dikembangkan sebagai geopolimer. Karakterisasi dilakukan menggunakan EDS mapping dan XRD pada slg NPI dengan ukuran 200 mesh. Hasil karakterisasi menunjukkan bahwa terdapat fasa quartz, clinoenstatite, silimanite, calcium peroxide, olivine, forsterite, fayalite dan hypothetikal silika. Fasa tersebut terindentifikasi melalui puncak-puncak difraktogram XRD pada sudut 20-70o. Selain itu, hasil mapping mengindikasikan beberapa senyawa seperti silika, magnesium dan oksigen tersebar diarea yang sama dan merata.

Prediksi Laju Erosi Baja API 5L pada Pipa Siku Minyak dan Gas Menggunakan Komputasi Fluida Hendy Roesma Wardhana; Atik Setyani; Sudaryanto Sudaryanto
Journal of Metallurgical Engineering and Processing Technology Vol 3, No 2 (February 2023)
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v3i2.8743

A large amount of oil and gas production needs to be followed by optimal pipeline maintenance. Most cases of pipe leaks are sudden in nature that able to cause losses over a long period of time. The gas consisting of sand particles able to increase erosion rate, especially at the pipe elbows. Cases of pipe leaks able to be prevented through routine inspections based on accurate erosion rate predictions. This study aims to predict the erosion rate of elbow piping systems using computational fluid simulations. The pipe material used is API 5L x60 and x70 steel. The simulation environment is arranged in such a way as to the reality on the oil and gas field. Methane gas containing sand particles with a hardness of 1100 HV is applied to this simulation. The simulation results prove that there is a relationship between the erosion rate, pipe hardness, and impact angle.Keywords: Erosion Rate Predictions, Elbow Pipe, and Hardness Pipe

Pengaruh Perlakuan Panas Terhadap Struktur Mikro Cu-based Shape Memory Alloy Atik Setyani; Hendy Roesma Wardhana
Journal of Metallurgical Engineering and Processing Technology Vol 2, No 3 (July 2022) Special Edition
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v2i3.9385

Paduan Shape Memory Alloy (SMA) memiliki kecerdasan fungsional yang dapat merespon tekanan maupun temperatur melalui transformasi termoelastik secara non difusi. Dalam pengembangannya, perlakuan panas akan sangat berpengaruh terhadap performa material yang dapat dilihat salah satunya melalui fasa martensit yang terbentuk. Oleh karena itu pada penelitian ini dipelajari pengaruh perlakuan panas dengan memvariasikan media pencelupan pada plat SMA Cu-28Zn-3Al wt. % terhadap sifat struktur mikronya. Media pencelupan yang digunakan dalam penelitian ini adalah campuran es kering+air (EW) dan es kering+alkohol (EA) sebagai media pendingin pada rentang temperatur (5 s.d -5 ℃). Tahapan penelitian dimulai dengan perlakuan betatizing plat Cu-28Zn-3Al wt. % pada temperatur 825 ℃ selama 30 menit kemudian di quenching dengan metode direct quench menggunakan variasi media pendingin yaitu EW dan EA. Karakterisasi dilakukan menggunakan optical microscope, XRD dan microvickers. Hasil pengamatan strukturmikro sampel as-quench menunjukkan bahwa perlakuan panas dengan variasi media pencelupan menyebabkan transformasi fasa dari α+β menjadi fasa martensit dan retained α. Selain itu, variasi media pendingin juga menyebabkan terjadinya perbedaan rasio fasa martensit dan retained α pada masing-masing sampel karena perbedaan laju pendinginan, namun tidak disertai perbedaan ukuran butir yang signifikan. Hasil pengujian microvickers menunjukkan kekerasan fasa martensit lebih tinggi dibandingkan dengan retained α.

ANALISIS FORMING LIMIT DIAGRAM (FLD) PADA MATERIAL TEMBAGA Mansyur Abdul Shaleh; Atik Setyani
Journal of Metallurgical Engineering and Processing Technology Vol 2, No 3 (July 2022) Special Edition
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v2i3.9372

Forming Limit Diagram also known as forming limit curve, is used in sheet metal forming to predict sheet metal forming behavior. The diagram contains a graphical description of a material failure test, such as the hollow dome test. This study aims to make a Forming Limit Diagram (FLD) of copper material with a thickness of 0.5 mm through the Nakazima standard FLD test using the experimental method research process. FLD test results are strengthened by tensile testing using the ASTM E8 standard with a cutting angle at 00 450, and 900 against the plate rolling direction. The results of the FLD test analysis on copper with a thickness of 0.5 mm show that the specimen has a maximum major strain value of 17.96% and a maximum minor strain of 7.05% while for tensile strength a cutting angle of 450 has the greatest maximum stress of 124,414 MPa, and experienced the greatest strain of 28.8%. specimen 00 true stress was 85.934 MPa, true strain was 14.5 %, and specimen 900 was true stress was 116.138 MPa, true strain was 25.4 %.

A Review of Reforming Processes in the Railway Manufacturing Industry : Case Study of PT. Industri Kereta Api (Persero) Stephanus Yosi Kristanta; Atik Setyani; Sudaryanto Sudaryanto; Muhammad Syukron; Muji Santoso
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12772

The railway manufacturing industry is critical for developing efficient and sustainable mass transportation systems. PT. Industri Kereta Api (Persero) (PT. INKA), a leading company in Indonesia, faces significant challenges due to deformation caused by residual stress during welding processes. This study reviews various reforming techniques implemented by PT. INKA to address these issues. The objectives include evaluating the effectiveness of these techniques and identifying potential improvements. Methods such as post-weld heat treatment (PWHT), controlled cooling, and mechanical tools are analyzed for their ability to mitigate deformation. The study demonstrates that PWHT reduces residual stress and improves material quality by homogenizing the microstructure. Controlled cooling techniques effectively reduce distortion by allowing even temperature distribution during the cooling process. Mechanical tools provide nonthermal methods to stabilize and control deformation, significantly reducing distortion levels. Despite the success of these techniques, PT. INKA faces challenges related to process control and skill variance among workers. The study concludes that while reforming techniques significantly enhance the structural integrity and performance of railway components, consistent implementation and clear guidelines are essential for future improvements. Developing new technologies, enhancing workforce training, and creating comprehensive process guidelines are recommended to maintain high standards and competitiveness in the global market.

Analysis of Primary Coating Thickness Effects on Adhesion Strength in S355J2+N Steel Material Andika Adevicky Irwansyah; Muhammad Syukron; Atik Setyani; Muji Santoso
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12796

Steel is a metal alloy primarily composed of iron, with carbon as its main alloying material along with several other components according to specific requirements. Low carbon steel has a carbon content of 0.05-0.3% and is easily manufacturable. This type of steel is commonly used for vehicle frames and other applications. The material used in this study is Carbon Steel S355J2, classified as low carbon steel with 0.15% carbon and 1.46% manganese. Carbon Steel S355J2 is used for the underframe of freight trains by PT Industri Kereta Api Indonesia. Coating and protection are crucial due to its susceptibility to corrosion, which can damage its structure in operational railway environments. As additional data for the company and learning for the researcher, a pull-off test was conducted varying the thickness of the primer coat. The results showed that sample A (110 µm), B (150 µm), and C (200 µm) achieved adhesion strengths of 2.5 MPa, 4.5 MPa, and 5 MPa respectively. The surface roughness level of the samples was 90 - 120 µm. Based on the test results, the most suitable coating system for the UGL underframe painting project for PT Industri Kereta Api (INKA) is a primer with a thickness of 150 µm (Sample B). This thickness is not too high, yet it significantly exceeds PT INKA's minimum criteria and avoids overcoating.

A Review of Reforming Processes in the Railway Manufacturing Industry : Case Study of PT. Industri Kereta Api (Persero) Kristanta, Stephanus Yosi; Setyani, Atik; Sudaryanto, Sudaryanto; Syukron, Muhammad; Santoso, Muji
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12772

The railway manufacturing industry is critical for developing efficient and sustainable mass transportation systems. PT. Industri Kereta Api (Persero) (PT. INKA), a leading company in Indonesia, faces significant challenges due to deformation caused by residual stress during welding processes. This study reviews various reforming techniques implemented by PT. INKA to address these issues. The objectives include evaluating the effectiveness of these techniques and identifying potential improvements. Methods such as post-weld heat treatment (PWHT), controlled cooling, and mechanical tools are analyzed for their ability to mitigate deformation. The study demonstrates that PWHT reduces residual stress and improves material quality by homogenizing the microstructure. Controlled cooling techniques effectively reduce distortion by allowing even temperature distribution during the cooling process. Mechanical tools provide nonthermal methods to stabilize and control deformation, significantly reducing distortion levels. Despite the success of these techniques, PT. INKA faces challenges related to process control and skill variance among workers. The study concludes that while reforming techniques significantly enhance the structural integrity and performance of railway components, consistent implementation and clear guidelines are essential for future improvements. Developing new technologies, enhancing workforce training, and creating comprehensive process guidelines are recommended to maintain high standards and competitiveness in the global market.

Analysis of Primary Coating Thickness Effects on Adhesion Strength in S355J2+N Steel Material Irwansyah, Andika Adevicky; Syukron, Muhammad; Setyani, Atik; Santoso, Muji
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12796

Steel is a metal alloy primarily composed of iron, with carbon as its main alloying material along with several other components according to specific requirements. Low carbon steel has a carbon content of 0.05-0.3% and is easily manufacturable. This type of steel is commonly used for vehicle frames and other applications. The material used in this study is Carbon Steel S355J2, classified as low carbon steel with 0.15% carbon and 1.46% manganese. Carbon Steel S355J2 is used for the underframe of freight trains by PT Industri Kereta Api Indonesia. Coating and protection are crucial due to its susceptibility to corrosion, which can damage its structure in operational railway environments. As additional data for the company and learning for the researcher, a pull-off test was conducted varying the thickness of the primer coat. The results showed that sample A (110 µm), B (150 µm), and C (200 µm) achieved adhesion strengths of 2.5 MPa, 4.5 MPa, and 5 MPa respectively. The surface roughness level of the samples was 90 - 120 µm. Based on the test results, the most suitable coating system for the UGL underframe painting project for PT Industri Kereta Api (INKA) is a primer with a thickness of 150 µm (Sample B). This thickness is not too high, yet it significantly exceeds PT INKA's minimum criteria and avoids overcoating.

Renewable Energy Revolution: A Review Of Innovative Strategies Towards Net Zero Emission (NZE) Naibaho, Nathan Gorga Tona; Setyani, Atik; Pratomo, Dias Dibyo
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14023

The Net Zero Emissions (NZE) program became a common term after the 2015 Paris Climate Agreement. This program aims to reduce environmental pollution that can cause global warming. Energy is one of the sectors that is the focus of the NZE program implementation efforts. The energy transition is a very important program, especially in relation to the NZE Program issue and mitigation of the Greenhouse Gas effect. The energy transition program must focus on reducing carbon intensity and providing more benefits to all households. Indonesia has committed to achieving NZE by 2060 or sooner. This study aims to examine the role of renewable energy in achieving the NZE program and analyze innovation strategies to accelerate the NZE program. This study uses a narrative literature review method to analyze information and literature. This study presents alternative solutions to the issue of renewable energy transition in realizing NZE. Utilization of abundant renewable energy to replace fossil fuels and also electrification of non-electricity sectors can be a priority solution in realizing NZE. In addition, the development of Carbon Capture, Utilization, Storage (CCUS), and Green Hydrogen technology is also very important for the industrial sector in mitigating the effects of greenhouse gases.

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