scholarly journals PENGARUH MEDIA QUENCHING TERHADAP KEKERASAN DAN STRUKTUR MIKRO PASKA HARDFACING

2018 ◽  
Vol 3 (2) ◽  
pp. 66-72
Author(s):  
Basori Basori
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Treatment Process ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Heat Treatment Process ◽  
Low Carbon ◽  
Water Media

AbstrakHardfacing dengan proses SMAW merupakan salah satu teknik yang paling banyak digunakan, karena sangat mudah diaplikasikan seperti pada scoops lift buckets , Ripper Teeth, dan Dozer Blades.. Hardfacing pada komponen ini bertujuan untuk mencegah keausanan yang diakibatkan benturan atau gesekan saat penggalian tanah, pengumpulan tanah, pengangkutan tanah pada saat alat berat sedang bekerja. Setelah baja karbon rendah di hardfacing, kemudian dilakukan perlakuan panas dengan Quenching dengan tujuan lebih meningkatkan kekerasan dari material. Pembuatan spesimen dilakukan dengan teknik SMAW polaritas AC arus 100A menggunakan elektroda HV 450 kemudian spesimen di potong, di lakukan proses heat treatment. Setelah selesai kemudian speseimen di uji keras dan dilakukan pengamatan dengan mikroskop optik. Media air merupakan media yang paling optimal dalam menigkatkan kekerasan dari hasil hardfacing. Nilai kekerasan yang didapatkan dari hasil quenching dengan media air adalah sebesar 422.66 VHNKata kunci: Hardfacing, SMAW, Struktur Mikro dan Kekerasan AbstractHardfacing with the SMAW process is one of the most common techniques, because it is very easy to apply as in lift buckets Scoops, Ripper Teeth, and Dozer Blades. Hardfacing in this component for the situation caused by collisions or friction during excavation of land, transporting the soil when the machine is working. After low carbon steel hardfacing, then heat is done with quenching in order to increase the hardness of the material. The making of specimens was carried out using the SMAW technique using HV 450 electrodes and then the specimens were cut, and the heat treatment process was carried out. After completion, the experiment was carried out and an observation with an optical microscope was carried out. Water media is the most optimal media in increasing the hardness of hardfacing results. The value obtained from the quenching with water media is 422.66 VHN Keywords: Hardfacing, SMAW, Microstructure and Hardness

Study on Thickness of Low Carbon Steel in Rapid Cooling Process: A Short Review

2020 ◽  
Vol 4 (1) ◽  
pp. 52-59
Author(s):  
Siti Noradila Abdullah ◽  
Norazlianie Sazali ◽  
Ahmad Shahir Jamaludin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Steel ◽  
Carbon Content ◽  
Treatment Process ◽  
Low Carbon Steel ◽  
Case Hardening ◽  
Heat Treatment Process ◽  
Low Carbon ◽  
Molecular Arrangement

For any process that engaged with changes of chemical properties and physical is a heat treatment process by cooling or heating a metal. The technique for heat treatment includes, case hardening, annealing, tempering and precipitation strengthening, quenching and tempering. The mechanical properties like hardness, toughness and ductility can be altered by intense heat treating on steel to produce different mechanical properties. This matters with the carbon content in low carbon steel such as mild steel with above 0.4% carbon, in Medium carbon steel with above 0.8% carbon, and in High Carbon Steel with up to 2% carbon content in steels. To change the characteristics of metals and alloys is by heat treatment process where by altering the diffusion and cooling rate within its microstructure to make them suitable for any kind of usage by changing the grain size at different phases and changing the molecular arrangement.

scholarly journals IDENTIFIKASI MATERIAL DAN PROSES PERLAKUAN PANAS LADAM UNTUK KUDA PACU

POROS ◽  
2018 ◽  
Vol 15 (2) ◽  
pp. 96
Author(s):  
Muki Satya Permana ◽  
Gatot Santoso ◽  
Bambang Heru
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Low Carbon Steel ◽  
Heat Treatment Process ◽  
Low Carbon ◽  
Horse Riding ◽  
Foreign Countries ◽  
Local Product ◽  
Equestrian Sport ◽  
Made In

Abstract: Equestrian sport or horse riding is very popular because not only for sports or hobby, but also for entertainment. The performance racehorse of the is largely determined by the suitability of the characteristics of horseshoes material with horse's hooves. This paper describes the identification of materials and heat treatment process of horseshoe made in local and imported products. Previous publication suggests that horseshoe made in foreign countries provides better performance than domestic products, especially in terms of flexibility of horse motion, durability, speed, and lifetime. Therefore, it is necessary to conduct research that emphasizes the observation of material characteristics, manufacturing and heat treatment process as a first step towards the substitution of imported products. A number of observations have been made on the two types of products:macro and micro observations, heat treatment process analyzes that have been subjected to materials, and mechanical testing. From the test results obtained that imported horseshoe material is low carbon steel with of 0.08 %, while carbon content for local product is 0.17%. Thus, both from the material side and from the side of manufacturing, including heat treatment process, local horseshoe products still need to be developed. 

scholarly journals To Investigate the Effect of Heat Treatment on Low Carbon Steel Corrosion Behavior

2018 ◽  
Vol 7 (3.20) ◽  
pp. 412
Author(s):  
Azhar Wahab Abdalrhem ◽  
Ali Jaber Naeemah ◽  
Makki Noori jawad
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Low Carbon Steel ◽  
Steel Corrosion ◽  
Optical Microscope ◽  
Polarization Measurement ◽  
Material Surface ◽  
Low Carbon

This work was to investigating the corrosion behavior of low carbon steel in a salt solution of 3.5wt% NaCl after undergoing two different types of heat treatment at 960 ºC in a furnace. The material of low carbon steel was cut into nine small pieces under three groups A, B and C, without heated annealing and hardening heat treatment respectively. The heat treatment was at temperature 960ºC. The hardness of the sample as received will be 203 kg/mm2 while after hardening the hardness was increased. The sample was mounted using hot and cold mounting. The microstructure and surface morphology was observed by using Scanning Electron Microscope (SEM) and Optical Microscope (OM) after grinding, polishing and etching on the sample. In group A cementite can be observed clearly on pearlite on the surface before corrosion test. After four days soaking in 3.5 wt% NaCl solution was observed all cementite and pearlite will be transformed to austenite with the remnants of cementite make the surface unstable hence increases the initial corrosion. After four days soaking when the cementite is oxidized and a thick film of corrosion product covers the material surface. The formation of Martensite due to quenching and rapid cooling in group C sample increases the corrosion rate from 0.072 mpy to 0.302 due to decreased of corrosion potential from -572 mV to -639 mV after four days soaking. The corrosion rate of each sample was measured by using electrochemical polarization measurement and Tafel extrapolation technique. From previous result, it was observed that samples which had undergone annealing mode of heat treatment turned out to be the ones with the best corrosion resistance.  

Modeling the Effect of Chemistry Changes on Phase Transformation Timing, Hardness, and Distortion in Carburized 8620 Gear Steel

2021 ◽  
Author(s):  
Jason Meyer ◽  
Stefan Habean ◽  
Dan Londrico ◽  
Justin Sims
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Treatment Process ◽  
Low Cost ◽  
Low Carbon Steel ◽  
Alloy Element ◽  
Case Hardening ◽  
Heat Treatment Process ◽  
Low Carbon ◽  
Using Data

Abstract AISI 8620 low carbon steel is widely used due to its relatively low cost and excellent case hardening properties. The nominal chemistry of AISI 8620 can have a large range, affecting the phase transformation timing and final hardness of a carburized case. Different vendors and different heats of steel can have different chemistries under the same AISI 8620 range which will change the result of a well-established heat treatment process. Modeling the effects of alloy element variation can save countless hours and scrap costs while providing assurance that mechanical requirements are met. The DANTE model was validated using data from a previous publication and was used to study the effect of chemistry variations on hardness and phase transformation timing. Finally, a model of high and low chemistries was executed to observe the changes in hardness, retained austenite and residual stress caused by alloy variation within the validated heat treatment process.

Experimental study of the mechanical and corrosion properties of ethyl silicate resin applied on low carbon steel

2021 ◽  
Vol 2 (108) ◽  
pp. 68-74
Author(s):  
M. Ali ◽  
J.H. Mohmmed ◽  
A.A. Zainulabdeen
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Open Circuit Potential ◽  
Low Carbon Steel ◽  
Open Circuit ◽  
Treatment Temperature ◽  
Ethyl Silicate ◽  
Low Carbon ◽  
Corrosion Properties ◽  
Mixture Ratio

Purpose: This work aimed at evaluating the properties of the ethyl silicate-based coating that can be applied on low carbon steel. Design/methodology/approach: Two mixture ratio types (2:1, and 3:2) of resin and hardener respectively were used to prepared two specimen models (A and B). Findings: It found that some mechanical properties (tensile, hardness, and impact strength) of ethyl silicate resin were evaluated according to standard criteria. Research limitations/implications: The effect of heat treatments at various temperatures (100, 150, and 200°C) and holding at different times (10, 20 & 30) min on hardness was investigated. Practical implications: Moreover, an open circuit potential corrosion test with a solution of 3.5% Sodium Chloride at room temperature and 60°C was used to determine the corrosion resistance of low carbon steel specimens coated with the two mixture types. Originality/value: The effects of mixture ratios (for resin and hardener) and heat treatment conditions on properties of ethyl silicate-based coating were studied. From obtained results, acceptable values of tensile, hardness, and toughness were recorded. Increasing heat treatment temperature and holding time leads to enhance hardness for both model types. An open circuit potential (OCP) tests show that there is an enhancement of protective properties of ethyl silicate coatings with mixture type B in comparison with type A was achieved. Generally, the results indicate that specimen model B has higher properties as compared with specimen model A.

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