The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Omar Khayyam Ribas - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of cooling behavior and residual stresses for Quenching with vegetable Oils at different bath temperatures
Journal of Cleaner Production, 2019Co-Authors: Pedro Paiva Brito, Pedro Augusto Ramos, Leandro Pegorete Resende, Douglas Antônio De Faria, Omar Khayyam RibasAbstract:Abstract The motivation to reduce industrial dependence of petroleum-derived products has highlighted the possibility of vegetable Oils as cooling media for Quenching operations. In the present work, the performance of vegetable Oils applied to Quenching carbon and alloy steels at different bath temperatures was analyzed, with the goal of assessing the influence of quenchant type and temperature on the residual stress state produced after Quenching. Natural soybean and sunflower Oils, as well as commercial mineral Quenching Oil, were chosen for investigation. First, the cooling behavior during Quenching was studied using bath temperatures of 25, 40, 60 and 80 °C. Subsequently, Vickers microhardness profiles were obtained along the cross-section of heat treated samples and residual stresses were determined by X-Ray Diffraction for all tested materials. The vegetable Oils selected for analysis produced hardening depths equivalent to the commercial mineral Oil when Quenching AISI 4340 alloy steel and lower absolute residual stress values.
Jin Rong-zhi - One of the best experts on this subject based on the ideXlab platform.
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Improvement of Cooling System for Quenching Oil in Continuous Carburizing Furnace
Heat Treatment Technology and Equipment, 2010Co-Authors: Jin Rong-zhiAbstract:Using the cooling system of Quenching Oil in continuous carburizing furnace composed of high efficiency air cooler.Several problems such as leakiness etc.which appear for the original Quenching Oil cooling system are solved.This cooling system has beenused in production for more than a year,and it is confirmed that not only safe and reliable operation,but also has energy saving,water saving,environmental protection and stable product quality.At present,the air cooler has been recommeded promotional item of heat treatment cleaner production and advanced technology in 2009~2011 by China Heat Treatment Association.
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Analysis and Safety Measures on Quenching Oil Firing and Gases Exploding in Heat Treatment Workshop
Heat Treatment Technology and Equipment, 2009Co-Authors: Jin Rong-zhiAbstract:The reason on Quenching Oil firing and gases exploding in heat treatment workshop are analyed in this paper.It is realized that the main reason leading to Quenching Oil firing is the too much Quenching parts in Quenching Oil tank,excessive water in Quenching Oil and poor circulating of Quenching Oil.The main reason causing combustible gases exploding is the security issue for controllable atmosphere furnace and its ancillary system and operating etc.At the same time,the improvement measures are also put forward.
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Measures on Improving Life of Quenching Oil
Heat Treatment Technology and Equipment, 2006Co-Authors: Jin Rong-zhiAbstract:Measures on preventing and reducing outside pollution,reasonable using and good managing for Quenching Oil,regular testing cooling property for Quenching Oil were used,speed of degeneration and ageing of Quenching Oil can be slown down,that is the service life of Quenching Oil is prolonged;Degenerated and aginged Quenching Oil was reformed,its service property can be resumed and service life can be prolonged.
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Regeneration of Quenching Oil
Heat Treatment of Metals, 2005Co-Authors: Jin Rong-zhiAbstract:Degenerated Quenching Oil was tested and analyzed.The results show that the degenerated Quenching Oil can be regenerated with various measures according to the actual conditions.Cooling characteristics of the regenerated Quenching Oil can be improved,the Quenching quality requirements can be met,and service life of Quenching Oil is prolonged consequently.
S. Asada - One of the best experts on this subject based on the ideXlab platform.
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Reduced pressure Quenching Oil and distortion
1996Co-Authors: S. Asada, M. OginoAbstract:Cooling process observed in a Quenching Oil`s cooling curve determination by JIS silver probe method, has been divided into three stages, vapor blanket stage, bOiling stage and convection stage. Under reduced pressure vaporization is accelerated and extend the vapor blanket stage which shift the position of bOiling stage the fastest of cooling speed among the cooling process toward low temperature side. Taking advantage of this behavior in Quenching under reduced pressure, it is possible to improve quench hardenability by controlling reduced pressure. Vapor pressure of Quenching Oil increases under very high vacuum and accelerates vapor blanket formation and covers the material with more vapor blanket, resulting in reduction of cooling speed. Excessive vapor blanket covering the material will lead to partially uneven Quenching of the treated material caused by uneven conditions by partial decomposition. Making vapor blanket distribution more even and to optimize uniform coating condition enables to prevent heat treatment distortion caused by uneven Quenching conditions.
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Comparative study of cooling curves with JIS silver specimens and alloy 600 specimens in relation to additive effectiveness
Journal of Materials Engineering and Performance, 1994Co-Authors: I. Tamura, K. Fukuhara, S. AsadaAbstract:Quenching- Oil cooling curves obtained using a silver specimen (Japanese Industrial Standard K 2242) in-dicate three stages of cooling: vapor blanket, bOiling, and convection. The temperatures at which the va-por blanket stage transfers to the bOiling stage and the bOiling stage transfers to the convection stage are referred to as the characteristic temperature (CT) and the convection- stage starting temperature (CSST), respectively. As the amounts of CT- improving additives are increased in increments of 1,2,3,6, 8, 10, and 12%, the CTs become higher, as clearly shown in the cooling curves obtained using a silver specimen. Likewise, as the amounts of CSST- improving additives are increased from 1 to 2 to 3%, the CSSTs become lower. These tendencies are similarly observed when using an Alloy 600 specimen, and both additives effectively improve cooling performance. However, in the case of 6,8,10, and 12% CT- im-proving additions, the differences among the additive concentrations are more pronounced in cooling curves obtained using the silver specimen than in those obtained using the Alloy 600 specimen. This can be attributed to the greater temperature sensitivity of the silver specimen thermocouple. In field quench-ing operations, such phenomena as insufficient hardness, inverse quench hardening, and unstable distor-tion can be remedied by additive treating. However, one must know what type of additive and how much to use. To this end, cooling curve measurement using silver specimens is useful .
Pedro Paiva Brito - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of cooling behavior and residual stresses for Quenching with vegetable Oils at different bath temperatures
Journal of Cleaner Production, 2019Co-Authors: Pedro Paiva Brito, Pedro Augusto Ramos, Leandro Pegorete Resende, Douglas Antônio De Faria, Omar Khayyam RibasAbstract:Abstract The motivation to reduce industrial dependence of petroleum-derived products has highlighted the possibility of vegetable Oils as cooling media for Quenching operations. In the present work, the performance of vegetable Oils applied to Quenching carbon and alloy steels at different bath temperatures was analyzed, with the goal of assessing the influence of quenchant type and temperature on the residual stress state produced after Quenching. Natural soybean and sunflower Oils, as well as commercial mineral Quenching Oil, were chosen for investigation. First, the cooling behavior during Quenching was studied using bath temperatures of 25, 40, 60 and 80 °C. Subsequently, Vickers microhardness profiles were obtained along the cross-section of heat treated samples and residual stresses were determined by X-Ray Diffraction for all tested materials. The vegetable Oils selected for analysis produced hardening depths equivalent to the commercial mineral Oil when Quenching AISI 4340 alloy steel and lower absolute residual stress values.
Feng Dong - One of the best experts on this subject based on the ideXlab platform.
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Tempering Quenching on Low-Alloy Structural Steel at Different Temperature Changes and Performance Analysis
DEStech Transactions on Materials Science and Engineering, 2017Co-Authors: Kang-cheng Dong, Li-juan Zhang, Feng DongAbstract:15CDV6 aviation and space industry development of high toughness and high-strength low-alloy structural steel. Aviation, space structures under different temperature tempering, Quenching Oil is typically used to meet different performance requirements. But there is no systematic study of the different Oil Quenching and tempering of steel microstructure and mechanical properties change, the purpose of Quenching and tempering effect of microstructure on mechanical properties and analysis of organizational change, analysis of the different temperature of the steel, steels and heat treatment process of evaluation studies.
