The Experts below are selected from a list of 2604 Experts worldwide ranked by ideXlab platform
N A Sulaiman - One of the best experts on this subject based on the ideXlab platform.
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effect of tempering temperature on mechanical properties of medium carbon steel
international journal of engineering trends and technology, 2014Co-Authors: S A Tukur, M M Usman, Isyaku Muhammad, N A SulaimanAbstract:Untempered martensitic steels, while very hard are too brittle to be useful for most applications. Most applications require that quenched part be tempered, so as to impact some toughness and further improve ductility. Current work reports and analyzes results of mechanical testing was performed on variously heat treated medium carbon steel samples, to arrive at an optimum heat treatment strategy for judicious combination of hardness and tensile properties. Tensile and hardness test specimens were fabricated using Lathe machine. These samples were subjected to various heat treatment sequences, consisting of full annealing, Hardening, Oil quenching, and tempering at different temperatures. Heat treated samples were then mechanically tested for hardness (Rockwell) and tensile properties (yield strength, ultimate tensile strength, ductility). Mechanical testing of medium carbon steel samples revealed that with increasing temper temperatures: (a) hardness first increases to a maximum and then gradually decreases; (b) yield strength first decreases, then increases, and then decreases again; (c) ultimate strength first increases to a maximum and then steadily decreases; and (d) ductility (% elongation) increases, and then decreases before continue to increases rather sharply. The optimum heat treatment strategy was found to be at tempering temperature of 250oC for well balanced mechanical properties.
Tatiana A. Siur - One of the best experts on this subject based on the ideXlab platform.
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Screening for efficient agents for transportation and treatment of Oil of South-Khylchuiu field
'PNRPU Publishing House', 2017Co-Authors: Iuliia V. Manakova, Valerii G. Riabov, Elena V. Ibraeva, Liudmila V. Zakshevskaia, Tatiana A. SiurAbstract:Oil of most of domestic and abroad fields is produced by a flooding of Oil-bearing formations method. That leads to intensive mixing of Oil and formation water and unavoidable formation of persistent water-Oil emulsions. Demulsifiers are used to destroy water-Oil emulsions and obtain commercial Oil in gathering, transportation and treatment systems. In case of high water cut and certain modes of transportation demulsifiers can be a reason of free water formation. Due to its aggressive behavior water can lead to corrosion of a lower part of pipeline system. Therefore, along with demulsifiers a corrosion inhibitor is injected into systems of well fluid transportation. But some demulsifiers, having good washing properties, wash off from internal walls of pipes both an Oil film and protective film of corrosion inhibitor adsorbed on them. In turn, some corrosion inhibitors can be emulsifiers, and adding them to a system of intratubular demulsification can have a negative effect on the processes of separation of water from Oil. In this regard, compatibility of demulsifiers and corrosion inhibitors is very relevant question. A solution for such problems needs to screen agents that will not reduce demulsifying and protective properties of each other. Oil of South-Khylchuiu field has high paraffin content and positive pour point. So, during transpiration it is needed to take into account that at low temperatures Oil reveals non-Newtonian properties. Stop in transportation will possibly show formation of paraffin structures. That can lead to decrease in rate capacity of pipeline and significantly complicate operation. Studies, carried out in the field of transportation of Oil with high paraffin content, revealed that in order to improve transportation of high-Hardening Oil and heavy Oil products it is possible to use substances such as flow stimulators (depressant additives). This method does not require large additional capital costs. With a sufficiently wide development of production of additives it can be economically more profitable compared to other methods of transportation
Polcar Adam - One of the best experts on this subject based on the ideXlab platform.
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The Cooling Media Influence on Selected Mechanical Properties of Steel
'Walter de Gruyter GmbH', 2020Co-Authors: Šmak Radim, Votava Jiří, Polcar AdamAbstract:The aim of experiment was to analyse the structural transformations and changes in mechanical properties of K720 steel during heat treatment (quenching). Three types of cooling medium were selected. The heating parameters and subsequent delays at the recrystallisation temperature were the same for all samples and were observed in a laboratory furnace. Water with the highest cooling capacity was selected as the benchmark cooling medium. Subsequently, the Hardening Oil TK – 46 was used. Sunflower Oil was selected as the last quenching medium, which can be considered an ecological replacement of quenching Oil with possibility of biological disposal. The microstructure and microhardness of individual samples were subjected to a metallographic evaluation and evaluated according to ČSN EN ISO 6507, respectively. The impact toughness analysis was performed according to the ČSN EN ISO 148-1 and a three-point bending test was performed according to ČSN EN ISO 7438. This test specifies a method for determining the ability of metallic materials to undergo plastic deformation in bending. The bend test includes subjection of round, square, rectangular or polygonal cross-section to plastic deformation by bending, without changing the direction of loading, until the specified angle of bend is reached
S A Tukur - One of the best experts on this subject based on the ideXlab platform.
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effect of tempering temperature on mechanical properties of medium carbon steel
international journal of engineering trends and technology, 2014Co-Authors: S A Tukur, M M Usman, Isyaku Muhammad, N A SulaimanAbstract:Untempered martensitic steels, while very hard are too brittle to be useful for most applications. Most applications require that quenched part be tempered, so as to impact some toughness and further improve ductility. Current work reports and analyzes results of mechanical testing was performed on variously heat treated medium carbon steel samples, to arrive at an optimum heat treatment strategy for judicious combination of hardness and tensile properties. Tensile and hardness test specimens were fabricated using Lathe machine. These samples were subjected to various heat treatment sequences, consisting of full annealing, Hardening, Oil quenching, and tempering at different temperatures. Heat treated samples were then mechanically tested for hardness (Rockwell) and tensile properties (yield strength, ultimate tensile strength, ductility). Mechanical testing of medium carbon steel samples revealed that with increasing temper temperatures: (a) hardness first increases to a maximum and then gradually decreases; (b) yield strength first decreases, then increases, and then decreases again; (c) ultimate strength first increases to a maximum and then steadily decreases; and (d) ductility (% elongation) increases, and then decreases before continue to increases rather sharply. The optimum heat treatment strategy was found to be at tempering temperature of 250oC for well balanced mechanical properties.
Iuliia V. Manakova - One of the best experts on this subject based on the ideXlab platform.
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Screening for efficient agents for transportation and treatment of Oil of South-Khylchuiu field
'PNRPU Publishing House', 2017Co-Authors: Iuliia V. Manakova, Valerii G. Riabov, Elena V. Ibraeva, Liudmila V. Zakshevskaia, Tatiana A. SiurAbstract:Oil of most of domestic and abroad fields is produced by a flooding of Oil-bearing formations method. That leads to intensive mixing of Oil and formation water and unavoidable formation of persistent water-Oil emulsions. Demulsifiers are used to destroy water-Oil emulsions and obtain commercial Oil in gathering, transportation and treatment systems. In case of high water cut and certain modes of transportation demulsifiers can be a reason of free water formation. Due to its aggressive behavior water can lead to corrosion of a lower part of pipeline system. Therefore, along with demulsifiers a corrosion inhibitor is injected into systems of well fluid transportation. But some demulsifiers, having good washing properties, wash off from internal walls of pipes both an Oil film and protective film of corrosion inhibitor adsorbed on them. In turn, some corrosion inhibitors can be emulsifiers, and adding them to a system of intratubular demulsification can have a negative effect on the processes of separation of water from Oil. In this regard, compatibility of demulsifiers and corrosion inhibitors is very relevant question. A solution for such problems needs to screen agents that will not reduce demulsifying and protective properties of each other. Oil of South-Khylchuiu field has high paraffin content and positive pour point. So, during transpiration it is needed to take into account that at low temperatures Oil reveals non-Newtonian properties. Stop in transportation will possibly show formation of paraffin structures. That can lead to decrease in rate capacity of pipeline and significantly complicate operation. Studies, carried out in the field of transportation of Oil with high paraffin content, revealed that in order to improve transportation of high-Hardening Oil and heavy Oil products it is possible to use substances such as flow stimulators (depressant additives). This method does not require large additional capital costs. With a sufficiently wide development of production of additives it can be economically more profitable compared to other methods of transportation
