scholarly journals Ultra Fast Spray Cooling and Critical Droplet Daimeter Estimation from Cooling Rate

2014 ◽  
Vol 02 (04) ◽  
pp. 259-270 ◽  
Author(s):  
Muhammad Aamir ◽  
Liao Qiang ◽  
Zhu Xun ◽  
Wang Hong ◽  
Muhammad Zubair
Keyword(s):  
Cooling Rate ◽  
Spray Cooling ◽  
Critical Droplet

Effects of water temperature on the spray cooling rate of aluminum alloy plate

2020 ◽  
Vol 169 ◽  
pp. 114928
Author(s):  
Cheng Zhu ◽  
Ruifeng Dou ◽  
Zhi Wen ◽  
Xunliang Liu ◽  
Yongbang Miao
Keyword(s):  
Aluminum Alloy ◽  
Water Temperature ◽  
Cooling Rate ◽  
Spray Cooling ◽  
Alloy Plate ◽  
Aluminum Alloy Plate

Effect of spray-cooling rate on the die-life of an HPDC die

2017 ◽  
Vol 3 (3) ◽  
pp. 274-285 ◽  
Author(s):  
Hiroshi Yamagata ◽  
Tomoyuki Kimura
Keyword(s):  
Cooling Rate ◽  
Spray Cooling ◽  
Die Life

Spray Cooling Rate Model of Heavy Cylinder Rolling

2014 ◽  
Vol 1006-1007 ◽  
pp. 173-176
Author(s):  
Yong Zhen Zhang ◽  
Jian Liang Sun ◽  
Yan Peng ◽  
Hong Min Liu ◽  
Su Wen Chen
Keyword(s):  
Heat Transfer ◽  
Mechanical Properties ◽  
Cooling Rate ◽  
Process Simulation ◽  
Spray Cooling ◽  
Cooling Capacity ◽  
Rate Model ◽  
Maximum Capacity ◽  
Quenching Process ◽  
Simulation Results

In order to eliminate the mixed crystals of the thick-walled heavy cylinder after rolling and improve the quench shortage of tank copious cooling, it is significant to analyze the cooling capacity of spray cooling and tank copious cooling. Models of heat transfer coefficient about spray cooling and copious cooling were established. The quenching process simulation was made based on the DEFORM software. The cooling rate models of center part about spray cooling and copious cooling were build. According to the CCT curves of heavy cylinder material and simulation results, which show that: (1) Using spray cooling can increase the cooling rate of center part to some extent and improve the mechanical properties. (2) The maximum capacity of spray cooling is 280mm, that is the microstructure of center part fully transfers to bainite, which is 50mm larger than copious cooling.

Cooling Rate, Microstructure and Property Studied of Spray Cooling of Heavy Shell Ring Rolling

2014 ◽  
Vol 941-944 ◽  
pp. 2414-2419
Author(s):  
Jian Liang Sun ◽  
Zheng Yi Jiang ◽  
Feng Jia ◽  
Yong Zhen Zhang
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Cooling Rate ◽  
Spray Cooling ◽  
Ring Rolling ◽  
Strength Increase ◽  
Shell Ring ◽  
Hydrogenation Reactor ◽  
Tensile Strength Increase ◽  
Ferrite Grain Size

In the present work, detailed studies were made on the transformation characteristics, microstructure and mechanical properties of heavy shell ring (HSR) in the spray cooling process. The spray cooling device of HSR was designed. The 2.25Cr1Mo0.25V steel used in production of HSR for hydrogenation reactor was selected as the testing material. The simulation of spray cooling of HSR was carried out on ABAQUS. The constitutive model and continuous cooling transformation (CCT) diagram of 2.25Cr1Mo0.25V were determined. CCT diagram, metallograph and SEM results show that the bainite forms throughout the cooling rate range from 0.5 to 10 ℃/s, and martensite begins to be produced by increasing the cooling rate higher than 60℃/s; when the cooling rate is 10 ℃/s, with the increase of the deformation degrees, the ferrite grain size becomes small, the yield strength and tensile strength increase, the elongation decrease, So it is good for refining the grain to increase the deformation. The yield strength, tensile strength and elongation were obtained under different cooling technology.

Air­-Water Mist Cooling Characteristics of an MS Plate in a Laboratory Scale ROT­ - An Experimental Observation

2021 ◽  
Vol 903 ◽  
pp. 45-49
Author(s):  
Rajdeep Sardar ◽  
Prishat Bachhar ◽  
Sounak Majumder ◽  
Pranibesh Mandal
Keyword(s):  
Mechanical Properties ◽  
Mild Steel ◽  
Cooling Rate ◽  
Steel Plate ◽  
Spray Cooling ◽  
Water Mist ◽  
Optimal Production ◽  
Modern Economy ◽  
Mist Cooling ◽  
Industrial Use

Steels of various grades are ubiquitous in the modern economy. Cooling of steel during the production process is an important deciding factor about its final mechanical properties. This is dependent on the characteristics of the industrial setup and coolant used. Studies have been undertaken for analysis of their influence on the cooling rate, given specific parameters, for suitable industrial use and optimal production. The present study and experiments undertaken highlight the variation of the cooling rate of a Mild Steel Plate in a miniaturized Run Out Table (ROT), using air­water mist spray cooling under different initial plate temperatures and nozzle bank distances.

Ultra Fast Cooling and Its Effect on the Mechanical Properties of Steel

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Soumya S. Mohapatra ◽  
Satya V. Ravikumar ◽  
Ravi Ranjan ◽  
Surjya K. Pal ◽  
Shiv Brat Singh ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Steel Plate ◽  
Cooling System ◽  
Spray Cooling ◽  
High Mass ◽  
Ultra Fast Cooling ◽  
Thick Steel ◽  
Fast Cooling ◽  
Ultrafast Cooling ◽  
Plate Distance

The objective of this work is to study about the ultrafast cooling of a hot static 6 mm thick steel plate (AISI-1020) by air assisted spray cooling. The study covers the effect of air flow rate and the water impingement density on the cooling rate. The initial temperature of the plate, before the cooling starts, is kept at 900 °C. The spray was produced from a full cone high mass flux and low turn down ratio air atomizer at a fixed nozzle to plate distance. The cooling rate shows that low turn down ratio air atomized spray can generate ultra fast cooling (UFC) rate for a 6 mm thick steel plate. After cooling, the tensile strength and hardness of the cooled steel plate were examined. The surface heat flux and surface temperature calculations have been performed by using INTEMP software. The result of this study could be applied in designing of fast cooling system especially for the run-out table cooling.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Suppression of γ’ Precipitation in a Laser-Melted Nickel-Base Alloy

1977 ◽  
Vol 35 ◽  
pp. 270-271
Author(s):  
J. M. Walsh ◽  
J. C. Whittles ◽  
B. H. Kear ◽  
E. M. Breinan
Keyword(s):  
Cooling Rate ◽  
Base Alloy ◽  
Material Surface ◽  
Intimate Contact ◽  
Absorbed Power ◽  
Perfect Contact ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Limiting Case ◽  
The Heat Transfer Coefficient

Conventionally cast γ’ precipitation hardened nickel-base superalloys possess well-defined dendritic structures and normally exhibit pronounced segregation. Splat quenched, or rapidly solidified alloys, on the other hand, show little or no evidence for phase decomposition and markedly reduced segregation. In what follows, it is shown that comparable results have been obtained in superalloys processed by the LASERGLAZE™ method.In laser glazing, a sharply focused laser beam is traversed across the material surface at a rate that induces surface localized melting, while avoiding significant surface vaporization. Under these conditions, computations of the average cooling rate can be made with confidence, since intimate contact between the melt and the self-substrate ensures that the heat transfer coefficient is reproducibly constant (h=∞ for perfect contact) in contrast to the variable h characteristic of splat quenching. Results of such computations for pure nickel are presented in Fig. 1, which shows that there is a maximum cooling rate for a given absorbed power density, corresponding to the limiting case in which melt depth approaches zero.

Voids in Quenched Nickel

1968 ◽  
Vol 26 ◽  
pp. 266-267
Author(s):  
J. J. Laidler
Keyword(s):  
Electron Beam ◽  
Ambient Temperature ◽  
Cooling Rate ◽  
Three Dimensional ◽  
Cooling Curve ◽  
Polycrystalline Nickel ◽  
Quenching Temperature ◽  
Long Tail ◽  
Diffusion Pump

The presence of three-dimensional voids in quenched metals has long been suspected, and voids have indeed been observed directly in a number of metals. These include aluminum, platinum, and copper, silver and gold. Attempts at the production of observable quenched-in defects in nickel have been generally unsuccessful, so the present work was initiated in order to establish the conditions under which such defects may be formed.Electron beam zone-melted polycrystalline nickel foils, 99.997% pure, were quenched from 1420°C in an evacuated chamber into a bath containing a silicone diffusion pump fluid . The pressure in the chamber at the quenching temperature was less than 10-5 Torr . With an oil quench such as this, the cooling rate is approximately 5,000°C/second above 400°C; below 400°C, the cooling curve has a long tail. Therefore, the quenched specimens are aged in place for several seconds at a temperature which continuously approaches the ambient temperature of the system.

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