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    Investigations on surface induced tribological characteristics in MQCL assisted machining of duplex stainless steel
    (Elsevier, 2022) Krolczyk, J. B.; Maruda, R. W.; Krolczyk, G. M.; Wojciechowski, S.; Gupta, Munish Kumar; Korkmaz, Mehmet Erdi
    A B S T R A C T The application of metalworking fluids (MWFs) are helpful in improving the tribological as well as machining characteristics while machining difficult to cut materials like duplex stainless steel. However, the adverse effect of commonly used MWFs limits its application in the area of clean and sustainable manufacturing. The strict environmental concerns, policies and regulations allow the usage of green cooling systems that positively effects the environment. Therefore, this study concerns the parametric evaluation of the surface induced tribological characteristics obtained after machining of difficult to cut stainless steel under dry and minimum quantity cooling lubrication conditions (MQCL). The various surface roughness parameters were evaluated with latest microscopes and the analysis was made under dry and MQCL conditions. In the end, the surface tribology has been studied and the results are compared with dry and MQCL conditions. The research reveals that the two-dimensional roughness analysis of the machined surface is very often limited to the one evaluated surface profile parameter. The outcomes also demonstrated that the MQCL produces smooth surfaces with less irregularities and could be considered in the context of sustainable manufacturing.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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    Role of sustainable cooling/lubrication conditions in improving the tribological and machining characteristics of Monel-400 alloy
    (Elsevier Sci Ltd, 2022) Ross, Nimel Sworna; Ganesh, M.; Srinivasan, D.; Gupta, Munish Kumar; Korkmaz, Mehmet Erdi; Krolczyk, J. B.
    Due to its strong corrosion resistance, high hardness, and ability to maintain its strength at high temperatures, Monel-400 is utilized in the marine, aerospace, and power plant sectors. Monel-400 alloy is hard to machine owing to quick tool wear that causes poor dimensional accuracy. Therefore, an advanced measurement system is required to monitor the insight of machining performance of difficult-to-machine alloys like Monel-400. In the present work, a new cutting technique is presented to increase the efficiency of cryogenic carbon dioxide (CO2) and minimum quantity lubrication (MQL) in the high-performance machining of Monel-400. The combination of both CO2 + MQL (CMQL) is an efficient approach that is supplied to the rake side and compared with dry, CO2 and MQL. Tool wear, surface roughness, temperature, chip morphology and microhardness measurements were performed to enumerate the influence of distinct cutting environments. Based on the findings of the systematic trials, CMQL was found to be the finest effective cooling technique, reducing friction to the greatest possible extent and creating the best possible surface. Under CMQL condition, the flank wear reduction was found to be 51-55 %, 37-47 % and 26-33 % compared to dry, MQL and CO2 conditions, respectively. Even though CMQL effectively reduces friction, the cryo medium outperformed and increased the machined face hardness.
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    Wear performance of Ti-6Al-4 V titanium alloy through nano-doped lubricants
    (Springernature, 2023) Etri, Hamza E. L.; Singla, Anil Kumar; Ozdemir, Mehmet Tayyip; Korkmaz, Mehmet Erdi; Demirsoz, Recep; Gupta, Munish Kumar; Krolczyk, J. B.
    Titanium and its alloys are widely utilized in the biomedical sector, they still exhibit poor tribological properties and low wear resistance when employed against even weaker substances. The poor hardness, instability, high coefficient of friction, low load-carrying capacity, and insufficient resistance to not only abrasive but also adhesive wear are further disadvantages of titanium alloys. The focus of this investigation is on the tribological performance of Ti-6Al-4 V alloy in contact with WC carbide abrasive balls when subjected to nanodoped cooling and lubrication conditions. Tribological experiments were executed on Ti-6Al-4 V flat samples using a ball-on-flat tribometer in dry hybrid graphene/boron nitride combination nanoparticles (MQL, nano-3), nanographene with MQL (nano-1), and boron nitride with MQL (nano-2) conditions. After that, the most significant tribological characteristics were investigated, including volume loss, friction coefficient, wear rate, and micrographic structures. The outcomes also demonstrated that the hybrid nanoparticle situation experienced the least amount of volume loss.