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(searched for: doi:10.23917/arstech.v1i1.11)
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, Abdelwahab Zerrouki, Mourad Nouioua, Hassan Guendouz, Hammoudi Abderazek, Ali Bouchoucha
Advances in Materials and Processing Technologies pp 1-12; https://doi.org/10.1080/2374068x.2022.2077526

Abstract:
The effectiveness of acid solutions as a quenching agent for medium carbon steel and 5083-H22 aluminium alloy was investigated in this work. The samples were quenched in different acidic solutions. Solution A consists of 99% water +1% HCl, solution B consists of 97% water +3% HCl and solution C consists of 95% water +5% HCl. Thermal camera of type FLIR T600 was used to calculate the heat transfer time between the samples and the media. The microstructural characteristics of the quenched specimens were examined with an optical microscope. The mechanical properties such as yield strength, tensile strength, elongation and hardness were obtained by the conventional method. The results reveal that the samples quenched in solutions B and C show a significant increase in terms of strength compared to samples quenched in water. The accelerated cooling in solutions B and C has a double advantage which leads to an increase in the strength of the steel without a great degradation of the deformation properties, and that’s what all mechanical engineers aspire. The obtained results on 5083-H22 aluminium alloy confirm the superiority of solutions B and C over water as a quenching agent in terms of strength, hardness and elongation.
Hariningsih, Tri Widodo Besar Riyadi
Published: 1 May 2021
Materials Science Forum, Volume 1029, pp 25-32; https://doi.org/10.4028/www.scientific.net/msf.1029.25

Abstract:
The sharp side of a steel axe is often broken. This part is usually forged into a tapered shape until the front edge is thin and sharp. The purpose of this study was to determine the effect of tempering on the structure and hardness of a steel axe made of AISI 5160 leaf spring steel which has undergone a forging and hardening process. The as-received samples were obtained from a commercial market after undergoing a forging process to reduce their thickness from 10 mm to 5.5 mm in the base part and 1 mm in the front edge part. The hardening process was carried out by heating the samples at a temperature of 850 °C followed by rapid cooling in an isorapid oil. The samples were then tempered with tempering temperatures of 300 °C, 350 °C, and 400 °C. The hardness of the tempered samples was evaluated using a Vickers microhardness tester in three different locations; the base, the middle, and the front edge of the tapered samples. To analyze the property change, the microstructure of the tempered samples was observed using SEM and EDS. The result showed that the hardness of the samples decreased with the increase in tempering temperature. The hardness of the front edge was higher than that of the middle and base part of the tempered samples. The faster cooling rate inside the thinner part was responsible for the higher hardness. The microstructure showed that the martensitic structure that emerged after the hardening process turned into fine tempered martensitic and secondary carbides. The size and amount of carbides increased with increasing tempering temperature
M. Fajar Sidiq, Soebyakto, Galuh Renggani Willis, M.Agus Shidik
IOP Conference Series: Materials Science and Engineering, Volume 1088; https://doi.org/10.1088/1757-899x/1088/1/012084

Abstract:
Low carbon steel has a carbon content between 0.01% - 0.2% C, has properties of malleability and machining, usually used for machines, machinery and mild steel. The disadvantages of this low carbon steel are its relatively low mechanical strength and poor corrosion resistance. By using coffee powder as a carburizing agent and as an inhibitor corrosion, it is expected that the mechanical strength and corrosion resistance can be increased. This study aims to determine the effect of using coffee grounds in increasing wear resistance, and its hardness and corrosion resistance using coffee powder media. The process is carried out by carburizing at a temperature of 9150C and held for 30 minutes with coffee powder media as charcoal and tempering at a temperature of 3250C to increase its mechanical strength. The next process is testing its corrosion resistance using a coffee powder inhibitor with a percentage of 10 Ppm, 20 Ppm, and 30 Ppm. The results showed an increase in the mechanical strength of low carbon steel by carburizing the process using coffee grounds. There was an increase in the hardness value of the hardness test specimen from 180 HB in raw material to 395.3 HB. In the wear test, there was a decrease in the value of the wear volume from 0.079 mm3 to 0.041 mm3. In testing the corrosion rate using coffee grounds as a corrosion inhibitor medium, it was found that the corrosion rate of the raw material decreased with a value of 2.153 mm / yr to 1.495 mm / yr when using coffee inhibitors with a level of 30 Ppm.
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