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Herry Oktadinata
Universitas Jenderal Achmad Yani
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Metal Indonesia

 1 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (801.311 KB) | DOI: 10.32423/jmi.2019.v41.47-54

Abstract

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

Abstract

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.
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

Abstract

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.
Co-Authors -, Taufiqullah Adi Ganda Putra Anugrah, Debby Laksana Apriyan, Agung Slamet Dewin Purnama Hamdi, Iqbal Hamzah, Rizal Nurdian Hilal Abdurrahman Misbah Juanda, Muhamad Nur Muhammad Zaki Mahbub Novi Laura Indrayani, Novi Laura Rifqi Al Hakim Al Hakim Riri Sadiana, Riri Robi Cahyadi, Robi Scendi Alamsyah Suteja, Ito