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PENGARUH TEMPERATUR PADA PEMBENTUKAN BAJA KARBON RENDAH ASTM A36 UNTUK APLIKASI HANGER ROD Oktadinata, Herry
Jurnal Ilmiah Teknik Mesin Vol 4 No 2 (2016): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1959.688 KB)

In this study tested the tenacity ASTM A36 carbon steel at high temperatures forming in the hanger rod as raw material, in order to obtain the relationship between the temperature of the formability. Research methods include chemical analysis and tensile testing room temperature and high temperature. Then do the formation ofhanger rod of carbon steel ASTM A36 diameter of 16, 20, 24 mm at a temperature of 600, 700, and 800 0C. Then test the hardness and microstructure observation. Tensile test results showed that the tensile strength and yield drops as temperature increases. Microstructure observation indicates the grain size at a temperature of 600 and 700 0C relatively the same, but at a temperature of 800 0C is much greater. Microstructure observation also shows that there are inclusions. Optimal results show that the formation of 600 and 700 0C better than at a temperature of 800 0C. While ductility at 700 0C is better than 600 0C. So the formation of rod hanger at 700 0C is recommended.

ANALISIS LAJU KEAUSAN BAJA SUJ2 HASIL VARIASI TEMPERATUR TEMPERING UNTUK APLIKASI BALL BEARING Cahyadi, Robi; Oktadinata, Herry; Sadiana, Riri
Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2019): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Baja SUJ2 merupakan material standar internasional yang umum digunakan untuk pembuatan bearing. Ketahanan aus (wear resistance) sangat dipengaruhi oleh nilai kekerasan. Hardness yang baik dapat dicapai dengan cara memberikan perlakuan panas pada material tersebut melalui tahapan heating, quenching, lalu tempering. Tujuan dari penelitian ini adalah mengetahui secara jelas laju keausan material baja SUJ2 yang diberikan perlakuan variasi temperatur tempering. Pada penelitian ini, material baja SUJ2 mendapatkan perlakuan tempering dengan variasi nilai temperatur sebesar 170 0C, 200 0C, 230 0C. Hasil pengujian dengan alat uji aus tipe Pin on Disk (ASTM G99) menunjukkan bahwa baja SUJ2 dengan perlakuan tempering 170 0C dan pembebanan alat uji aus sebesar 4,9 N memiliki ketahan aus paling baik yaitu 0,7228 mm3/menit, sedangkan material baja SUJ2 dengan perlakuan tempering 230 0C dan pembebanan alat uji aus sebesar 14,7 N memiliki ketahanan aus paling buruk yaitu 2,3098 mm3/menit.

PENGARUH WELDING REPAIR TERHADAP SIFAT MEKANIK PADA PENGELASAN GTAW BAJA DUPLEX UNS S32760 Juanda, Muhamad Nur; Oktadinata, Herry; -, Taufiqullah
Jurnal Ilmiah Teknik Mesin Vol 7 No 2 (2019): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Technological developments in the increasingly advanced industrial sector cannot be separated from the welding method, one of which is welding repair. Welding improvements can affect the mechanical properties and microstructure of the material used. This research was conducted to determine the effect of welding repair on UNS S32760 stainless steel duplex material using ER 2594 welding wire which was applied to a vacuum vessel tank. The process of welding original welding in sample 1 using a welding wire with a diameter of 2.4 mm receiving the largest heat input 1.394 kJ / mm. The welding repair process carried out on sample 2 using 2.4 mm diameter welding wire received the largest heat input 1.111 kJ / mm and in sample 3 also experienced welding repair using a welding wire of 2.00 mm receiving the largest heat input 1.347 kJ / mm. The impact test results showed a decrease in the toughness value in sample 2 and sample 3 which underwent welding repair. While the results of Vickers hardness testing increased in sample 2 and sample 3 which underwent a repair welding process, was directly proportional to the increase in heat input received in each sample. The microstructure in samples 2 and 3 changed the phase of Ferrite to Acicular Ferrite. In the HAZ and WL regions in sample 3 Ferrite Grain Boundary is also formed, where Grain Boundary-Ferrite is formed first in the transformation of Austenite to Ferrite, which usually forms along the Austenite boundary. In this research, welding repair process that has mechanical properties close to the mechanical properties of Base Metal is sample 2 which uses 2.4 mm diameter welding wire for welding repair.

PENGARUH VARIASI POSISI PENGELASAN TERHADAP DISTORSI DAN SIFAT MEKANIK HASIL PENGELASAN BAJA SS400 MENGGUNAKAN METODE GMAW Hamdi, Iqbal; -, Taufiqullah; Oktadinata, Herry
Jurnal Ilmiah Teknik Mesin Vol 8 No 1 (2020): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Pengelasan merupakan metode penyambungan dua material atau lebih yang sering digunakan dalam bidang konstruksi. Metode pengelasan yang digunakan dalam penelitian ini adalah Gas Metal Arc Welding (GMAW) dengan logam pengisi ER70S-6. Pengelasan dilakukan dilakukan pada baja karbon rendah SS400 dengan ukuran panjang 200 mm, lebar 105 mm, dan tebal 12 mm. Tujuan penelitian ini adalah menyelidiki struktur mikro, distorsi, dan sifat mekanik sambungan las GMAW baja karbon rendah akibat variasi posisi pengelasan Posisi pengelasan 1G, 2G, dan 3G. Dari hasil penelitian diketahui bahwa posisi pengelasan 1G menghasilkan distorsi lebih besar dari pada posisi pengelasan 2G dan posisi pengelasan 3G. dimana pada posisi pengelasan 1G nilai distorsi terbesarnya adalah 5,42 mm dengan heat input 1.7 Kj/mm. sedangkan besaran distorsi yang terjadi pada posisi pengelasan 2G nilai distorsi terbesarnya adalah 2,39 mm dengan heat input 0.7 Kj/mm. Dari hasil analisis ditemukan bahwa perbedaan posisi pengelasan menghasilkan jumlah heat input yang berbeda, dengan peningkatan heat input akan meningkatkan besaran distorsi yang terjadi.

ANALISIS PENGARUH JARAK KAMPUH HASIL PENGELASAN BAJA SS400 TERHADAP SIFAT MEKANIK MATERIAL MENGGUNAKAN METODE GMAW Indrayani, Novi Laura; Oktadinata, Herry; Suteja, Ito
Jurnal Ilmiah Teknik Mesin Vol 8 No 2 (2020): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Welding techniques have been used extensively in the construction field because welding techniques are a simpler method in the process of connecting steel than using bolts or rivets. Factors that influence the quality of welding results include distance of the seam. The seam distance can affect the increase in heat input value because the wider the seam distance the more filler metal will be used. The purpose of this study was to determine how the effect of variations in the distance of the seam to the mechanical properties of SS400 steel welding material using the GMAW method. SS400 steel welding welding position 2G with variations in the root gap distance of 0 mm, 2 mm and 4 mm using the GMAW method with a type of protective gas 82% Ar + 18% CO2 and ESAB ER70S-6 type welding wire. Single v butt joint type with a seam angle of 60o and 12 mm thick material. In this study several tests were conducted including distortion testing, non-destructive test, tensile, chemical composition, hardness and microstructure observation. The highest distortion test results obtained at a root gap of 4 mm seam, non-destructive test results showed no welding defects in the upper surface of the weld, the optimal tensile testing results were obtained on a sample root gap of 2 mm with a tensile strength value of 413 MPa and fractures that occurred in the base area metal. The highest hardness test results were obtained at a sample root gap of 0 mm ap with a value of 235 HV and the lowest hardness obtained at a root gap of 4 mm with a value of 209 HV.

MICROSTRUCTURE AND HARDNESS PROFILE OF DISSIMILAR LAP JOINT OF TYPE 304 STAINLESS STEEL TO SS400 CARBON STEEL Herry Oktadinata; Adi Ganda Putra
Jurnal Metal Indonesia Vol 41, No 2 (2019): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Dissimilar metal welds between austenitic stainless steel and carbon steel are commonly used in oil and gas industries for certain reasons. The objective of this research is to asses the effect of filler metal and shielding gas on the microstructure and hardness of dissimilar lap joint of type 304 austenitic stainless steel to JIS SS400 low carbon steel. For the purpose of this investigation, the weldments were produced using flux-cored arc welding (FCAW). Three types of filler metals (E316L, E309L and E308L) and two different gas compositions (100%CO2 and 90%Ar+10%CO2) were selected to be used. Each of the weldments were analyzed on the microstructure characteristic and hardness profile of base metal (BM), heat affected zone (HAZ) and weld metal (WM) using optical microscope and microhardness Vickers. The metallographic examination revealed HAZ-SS400 contains martensites. Both HAZ-304 and WM show austenitic microstructure, with columnar and cellular sub-structures present at WM. The hardness profile of HAZ-304 is higher than BM-304, it may be attributed to the presence of the fine grains in HAZ-304 due to high temperature during welding. The hardness profile of WM-E309L exhibited the hardness from HAZ to WM tend to decrease linearly, while WM-E316L and WM-E308L showed the hardness from HAZ to WM also decreased but drastically dropped at fusion line (FL). The welds using E309L offer the best result in the point of view homogeneity of the hardness profile.

Pengaruh Temperatur Tempering terhadap Sifat Mekanik dan Struktur Mikro Besi Cor Nodular Herry Oktadinata; Hilal Abdurrahman Misbah
Jurnal Metal Indonesia Vol 44, No 2 (2022): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2022.v44.51-59

Eksperimen ini bertujuan untuk menginvestigasi perubahan sifat mekanik dan struktur mikro besi cor nodular setelah dilakukan tempering pada temperatur 350 °C dan 450 °C dengan waktu penahanan selama satu jam dan dilanjutkan pendinginan udara. Sebelum dilakukan tempering terlebih dahulu dilakukan perlakuan panas hardening pada temperatur 850 °C dengan waktu penahanan selama satu jam dan quenching dengan media oli. Besi cor nodular yang digunakan pada penelitian ini memiliki kandungan 3,45% C, 2,6% Si, 0,635% Mn, 1,58% Ni, 0,275% Cr, dan 0,1% Mg. Kekerasan dan kekuatan tarik besi cor nodular sebelum perlakuan panas (as-cast) adalah 41,5 HRC dan 532,88 MPa. Hasil eksperimen menunjukkan besi cor nodular yang mengalami tempering pada temperatur 350 °C memiliki kekerasan sebesar 50,5 HRC dan kekuatan tarik sebesar 724,04 MPa. Sedangkan hasil tempering pada temperatur 450 °C memiliki kekerasan sebesar 47 HRC dan kekuatan tarik sebesar 722,97 MPa. Dari hasil pengujian tersebut dapat disimpulkan bahwa besi cor nodular yang mengalami tempering pada temperatur 350 °C memiliki kekuatan lebih tinggi daripada hasil tempering pada temperatur 450 °C. Hal ini dapat disebabkan karena struktur mikro besi cor nodular hasil tempering pada temperatur 350 °C memiliki nodularity lebih tinggi dan persentase area karbida yang lebih besar dibandingkan hasil tempering pada temperatur 450 °C.

PENGARUH MASUKAN PANAS TERHADAP DISTORSI DAN SIFAT MEKANIK PADA PENGELASAN DISSIMILAR BAJA AISI 304 DAN BAJA SS400 MENGGUNAKAN METODE GTAW Muhammad Zaki Mahbub; Herry Oktadinata
Jurnal Ilmiah Teknik Mesin Vol 11 No 1 (2023): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/jitm.v11i1.5595

Pengelasan dissimilar sering digunakan pada pembangkit listrik, perkapalan dan kontruksi lainnya. Pengelasan dissimilarini menggunakan baja tahan karat AISI 304 dan baja karbon SS400 dengan ukuran 200 x 200 x 6 mm. Metode pengelasanmenggunakan GTAW dengan filler metal ER 309 L berdiameter 2,4 mm. Permasalahan yang sering muncul padapengelasan dissimilar adalah distorsi yang terjadi karena pemuaian serta penyusutan akibat siklus termal. Pengelasandissimilar bertujuan untuk memahami sifat mekanik serta distorsi yang terpengaruhi oleh masukan panas. Penelitian inimemvariasikan masukan panas 1,2 kJ/mm dan masukan panas 0,85 kJ/mm. Pengujian yang dilakukan pengukurandistorsi, pengamatan struktur mikro, uji tarik dan uji kekerasan. Distorsi tertinggi terdapat pada masukan panas 1,2 kJ/mmsebesar 1,53 mm, distorsi terjadi pada arah transversal. Hasil uji tarik semua patahan terjadi pada base metal SS400dengan nilai rata rata 530 MPa. Hasil uji kekerasan menunjukan bahwa titik fusion line nilai kekerasannya lebih tinggidibandingkan dengan base metal. Pada pengamatan struktur mikro daerah fusion line SS400 memiliki fasa ferit dan perlit,untuk daerah weld metal memiliki fasa ferit, austenit dan dendritik, pada bagian fusion line AISI 304 memiliki fasa feritdan austenit. Pengaruh masukan panas ini dapat disimpulkan bahwa semakin tinggi masukan panas semakin tinggi nilaidistorsi yang dihasilkan. Masukan panas berpengaruh terhadap HAZ dan fusion line karena meningkatnya nilai kekerasan.

Analisis Kegagalan pada Komponen Work Roll Setelah Perlakuan Panas Rifqi Al Hakim Al Hakim; Herry Oktadinata
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 22 No 1 (2023): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol22no1.463

There has been a failure on the work roll components of the nodular cast iron type after the heat treatment, and the failure is in the form of cracks on the surface. In the heat treatment process, it can cover the whole or part of the component, and the consequence is that some elements will crack due to internal stress. This failure analysis research aims to find out the causes failure of work roll component. In this study, were carried out a visual inspection, non-destructive testing of dye penetrant and ultrasonic test, chemical composition test, fractography test microstructure test, and Rockwell C hardness test for the failed work roll components. The results showed that the component had high hardness and become brittle fracture. The content of 0,275% chromium can influence the high hardness of a carbide former. This amount exceeds 0,10% of the chromium composition of nodular cast iron, which makes carbides difficult to remove through heat treatment. Cracks in work roll components can also be affected by stress concentrations due to sudden changes in cross-sectional area during heat treatment triggered by porosity, inclusions, and acute angles.

Analisis Struktur Mikro dan Ketahanan Aus Besi Tuang Nodular untuk Aplikasi Work Roll Herry Oktadinata; Scendi Alamsyah
Jurnal Metal Indonesia Vol 45, No 1 (2023): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2023.v45.28-36

Work roll merupakan komponen yang dibutuhkan dalam proses pengerolan baja. Umur pakai work roll dipengaruhi oleh beberapa sifat seperti kekerasan, ketahanan aus, stabilitas material pada suhu tinggi dan ketahanan terhadap kejutan termal. Tujuan penelitian ini adalah untuk mengkaji struktur mikro dan ketahanan aus besi tuang nodular yang digunakan untuk aplikasi work roll. Penelitian ini dilakukan pada tiga work roll yang disuplai oleh pabrikan berbeda, masing-masing disebut sampel A, B, dan C. Pengujian yang dilakukan meliputi pengujian komposisi kimia, pengamatan struktur mikro, pengujian kekerasan dan laju keausan. Hasil penelitian menunjukkan bahwa struktur mikro dari sampel A memiliki lebih banyak perlit dan sedikit ferit dengan kandungan 1,26% Si, 3,32% C yang menghasilkan carbon equivalent (CE) sebesar 3,73%, nodularity 54,94%, kekerasan 48,16 HRC, dan laju keausan 10,9 x 10-4 gram/menit. Sampel B memiliki sedikit perlit dan banyak ferit dengan kandungan 2,19% Si dan 2,49% C yang menghasilkan CE sebesar 3,21%, nodularity 73,73%, kekerasan 40,16 HRC, dan laju keausan 13,1 x 10-4 gram/menit. Dan sampel C memiliki lebih banyak perlit dan sedikit ferit dengan kandungan 2,6% Si dan 3,45% C yang menghasilkan CE sebesar 4,308%, nodularity 68,96%, kekerasan 49,66 HRC, dan laju keausan 8,1 x 10-4 gram/menit. Dari data tersebut dapat disimpulkan bahwa komponen work roll sampel C memiliki sifat ketahanan aus yang tinggi dengan laju keausan sebesar 8,1 x 10-4 gram/menit dengan kekerasan tertinggi sebesar 49,66 HRC. AbstractWork roll is a required component in the steel rolling process. The service life of work rolls is affected by several properties such as hardness, wear resistance, material stability at high temperatures and resistance to thermal shock. The aim of this work was to study the microstructure and wear resistance of nodular cast iron used for work roll applications. This study was conducted on three work rolls from different suppliers, each called samples A, B, and C. The investigation included the chemical composition measurement, microstructure observation, hardness test and wear rate. The results showed that the microstructure of sample A had more pearlite and less ferrite with 1.26% Si and 3.32% C, which resulted in a CE of 3.73%, nodularity 54,94%, hardness 48.16 HRC, and wear rate of 10.9 x 10-4 gr/min. Sample B has a little pearlite and a lot of ferrite with 2.19% Si and 2.49% C, which produces a CE of 3.21%, nodularity 73,73%, hardness 40.16 HRC, and wear rate of 13.1 x 10-4 g/min. And sample C has more pearlite and less ferrite with elements 2.6% Si and 3.45% C, which produces a CE of 4.308%, nodularity of 68,96%, hardness of 49.66 HRC, and wear rate of 8.1 x 10-4 g/min. From these data, sample C's work roll component has high wear resistance with a wear rate of 8.1 x 10-4 g/min with the highest hardness of 49.66 HRC.

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