The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Iskander Tlili - One of the best experts on this subject based on the ideXlab platform.
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The experimental/numerical investigation of variations in strip speed, water shower pattern and water temperature on high-temperature strip cooling rate in hot strip mill
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Javad Karimi Kerdabadi, Maedeh Haghanimanesh, Arash Karimipour, Davood Toghraie, Iskander TliliAbstract:Hot-rolled strips are cooled on the run-out table to achieve the customer-required mechanical properties. Cooling reduces the oxidation, which can assist the coiling operation. The ability to obtain a range of mechanical properties from a single steel grade reduces the use of alloying elements (elements added to a metal or an alloy which are incorporated in the metallic structure and change in the properties of the basic alloy) and the size of the slab inventories. So in this paper, the high-temperature steel strip cooling pattern with the temperature of 870 °C and reaching the temperature of 630 °C using water and air is studied. Moreover, the numerical simulation of the high-temperature strip cooling and its cooling method is carried out. The results are compared with the similar sampler ones. The changes of three key parameters such as change in strip speed and its effect on cooling rate, change in pattern and arrangement of water showers and its effects and change in the cooling water temperature are investigated. It was found that the uniformity of the heat distribution inside the strip was increased, but the temperature of the strip was lower than the required temperature. The middle and up surface temperatures of the strip were performed at a speed of 3.48 (m s^−1), which showed a very good match with the actual tested sample.
R P Cavalieri - One of the best experts on this subject based on the ideXlab platform.
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high temperature short time thermal quarantine methods
Postharvest Biology and Technology, 2000Co-Authors: Juming Tang, J N Ikediala, Shaojin Wang, James D Hansen, R P CavalieriAbstract:Abstract In this paper, kinetic models are discussed with respect to their uses in describing the intrinsic thermal mortality of insect pests. A unique heating block system was used to obtain kinetic information for the thermal mortality of codling moth larvae. The kinetic data demonstrated the possibility to develop high-temperature-short-time thermal treatments to control codling moth and reduce thermal impact on product quality. Equations are presented to evaluate cumulative effects of any time–temperature history on the thermal mortality of target insect pests and on the quality of host materials. Computer simulation results demonstrated that the cumulative thermal effects on product quality during the heating period in conventional hot air or hot water treatments are much more important than the cooling period. Radio frequency (RF) heating or microwave heating is suggested as an alternative to reduce adverse thermal impact to treated commodities during the heating period. A case study is presented to demonstrate the effect of RF heating in a high-temperature-short-time thermal treatment to control codling moth larvae in in-shell walnuts.
Jerzy Banaszek - One of the best experts on this subject based on the ideXlab platform.
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simplified thermo fluid model of an engine Cowling in a small airplane
Aircraft Engineering and Aerospace Technology, 2014Co-Authors: Piotr łapka, Miroslaw Seredynski, Piotr Furmanski, Adam Dziubinski, Jerzy BanaszekAbstract:Purpose – The purpose of this study is to developed a simplified thermo-fluid model of an engine Cowling in a small airplane. An aircraft engine system is composed of different elements operating at various temperatures and in conjunction with the composite nacelle creates a region with high intensity of heat transfer to be covered by the cooling/ventilation systems. Therefore a thermal analysis, accounting for the complex heat transfer modes, is necessary in order to verify that an adequate cooling is ensured and that temperatures of the nacelle are maintained within the operating limits throughout the whole aircraft's flight. Design/methodology/approach – Simplified numerical simulations of conductive, convective and radiative heat transfer in the engine bay of the small airplane I-23 in a tractor arrangement were performed for different air inlet and outlet configurations and for varying conditions existing in air inlets during the flight. The model is based on the control volume approach for heat and ...
R D K Misra - One of the best experts on this subject based on the ideXlab platform.
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The determining impact of coiling temperature on the microstructure and mechanical properties of a titanium-niobium ultrahigh strength microalloyed steel: Competing effects of precipitation and bainite
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: V.v. Natarajan, Veerabhadra Swamy Challa, D.m. Sidorenko, M.d. Mulholland, M. Manohar, R D K Misra, J.e. HartmannAbstract:Abstract We elucidate here the influence of coiling temperature on the microstructure and mechanical properties, in an ultrahigh strength titanium-niobium microalloyed steel. The objective was to underscore the impact of coiling temperature on the nature and distribution of microstructural constituents (including different phases, precipitates, and dislocation structure) that significantly contributed to differences in the yield and tensile strength of these steels. Depending on the coiling temperature, the microstructure consisted of either a combination of fine lath-type bainite and polygonal ferrite or polygonal ferrite together with the precipitation of microalloyed carbides of size ~2–10 nm in the matrix and at dislocations. The microstructure of steel coiled at lower temperature predominantly consisted of bainitic ferrite with lower yield strength compared to the steel coiled at higher temperature, and the yield to tensile strength ratio was 0.76. The steel coiled at higher temperature consisted of polygonal ferrite and extensive precipitation of carbides and was characterized by higher yield strength and with yield strength/tensile strength ratio of 0.936. The difference in the tensile strength was insignificant for the two coiling temperatures. The observed microstructure was consistent with the continuous cooling transformation diagram.
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microstructure and mechanical properties of a novel 1000 mpa grade tmcp low carbon microalloyed steel with combination of high strength and excellent toughness
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Hui Xie, R D K MisraAbstract:Abstract A novel low carbon Nb–V–Ti–Cr microalloyed bainitic steel with yield strength of 1000 MPa and excellent low temperature toughness was successfully processed. Two cooling procedures were adopted to optimize the mechanical properties. The microstructural evolution, precipitation behavior, and strengthening mechanisms were systematically studied, and the fracture mechanisms were analyzed via combination of fractographs and deflection–load curves. The experimental results indicated that the steel subjected to cooling rate of 65 °C/s and coiling temperature of ~380–400 °C resulted in superior mechanical properties. The yield strength, tensile strength, yield ratio, and elongation-to-fracture were 1058 MPa, 1192 MPa, 0.88, and 10.6%, respectively. The impact energy of the 1/4-size Charpy specimen and tested at −20 °C was 24 J. The ultra-high yield strength is primarily attributed to transformation strengthening from lower bainite and precipitation hardening from nano-scale (Nb,Ti)C precipitates. The excellent toughness is associated with lower bainite and acicular ferrite together with high fraction of large misorientation grain boundaries by controlling the coiling temperature.
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the effect of coiling temperature on the microstructure and mechanical properties of a niobium titanium microalloyed steel processed via thin slab casting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Veerabhadra Swamy Challa, R D K Misra, W H Zhou, Ronald J Omalley, S G JanstoAbstract:Abstract We describe here the influence of coiling temperature on the microstructure and mechanical properties, especially toughness, in a low carbon niobium microalloyed steel processed via thin slab casting. The objective is to elucidate the impact of coiling temperature on the nature and distribution of microstructural constituents (including different phases, precipitates, and dislocations) that contribute to variation in the strength–toughness relationship of these steels. In general, the microstructure primarily consisted of fine lath-type bainite and polygonal ferrite, and NbC, TiC and (Nb, Ti)C precipitates of size ~2–10 nm in the matrix and at dislocations. However, the dominance of bainite and distribution of precipitates was a function of coiling temperature. The lower coiling temperature provided superior strength–toughness combination and is attributed to predominantly bainitic microstructure and uniform precipitation of NbC, TiC, and (Nb, Ti)C during the coiling process, consistent with continuous cooling transformation diagrams.
Javad Karimi Kerdabadi - One of the best experts on this subject based on the ideXlab platform.
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The experimental/numerical investigation of variations in strip speed, water shower pattern and water temperature on high-temperature strip cooling rate in hot strip mill
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Javad Karimi Kerdabadi, Maedeh Haghanimanesh, Arash Karimipour, Davood Toghraie, Iskander TliliAbstract:Hot-rolled strips are cooled on the run-out table to achieve the customer-required mechanical properties. Cooling reduces the oxidation, which can assist the coiling operation. The ability to obtain a range of mechanical properties from a single steel grade reduces the use of alloying elements (elements added to a metal or an alloy which are incorporated in the metallic structure and change in the properties of the basic alloy) and the size of the slab inventories. So in this paper, the high-temperature steel strip cooling pattern with the temperature of 870 °C and reaching the temperature of 630 °C using water and air is studied. Moreover, the numerical simulation of the high-temperature strip cooling and its cooling method is carried out. The results are compared with the similar sampler ones. The changes of three key parameters such as change in strip speed and its effect on cooling rate, change in pattern and arrangement of water showers and its effects and change in the cooling water temperature are investigated. It was found that the uniformity of the heat distribution inside the strip was increased, but the temperature of the strip was lower than the required temperature. The middle and up surface temperatures of the strip were performed at a speed of 3.48 (m s^−1), which showed a very good match with the actual tested sample.
