scholarly journals Influence of Heterogeneity of Heat Transfer Coefficient in Quenching Process on Internal Structure and Mechanical Behavior in Materials.

2002 ◽  
Vol 68 (675) ◽  
pp. 1567-1573
Author(s):  
Ryuji MUKAI ◽  
Dong-Ying JU
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Mechanical Behavior ◽  
Internal Structure ◽  
Quenching Process

Numerical Analysis on Heat Transfer Coefficient of Large Die Steel Quenching

2012 ◽  
Vol 487 ◽  
pp. 449-452
Author(s):  
Xin Xiao Bian ◽  
Chao Zhang ◽  
Lin Zhu Qian
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Process Simulation ◽  
Air Cooling ◽  
Empirical Equations ◽  
Surface Conditions ◽  
Die Steel ◽  
Quenching Process ◽  
The Heat Transfer Coefficient

Heat transfer coefficient is one of the most important boundary conditions for quenching process simulation. It depends on many factors, such as material, size, surface conditions of a part, and so on. It is, therefore, difficult to evaluate the heat transfer coefficient accurately. T In the environment for large modules P20 and the actual heat transfer conditions, the off-line air-cooling heat transfer coefficient of C are simulated by using empirical equations.

Heat transfer coefficients for quenching process simulation

2004 ◽  
Vol 120 ◽  
pp. 269-276
Author(s):  
M. Maniruzzaman ◽  
R. D. Sisson
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Process Simulation ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Quenching Process

Quenching heat treatment in a liquid medium is a very complex heat transfer process. Heat extraction from the part surface occurs through several different heat transfer mechanisms in distinct temperature ranges, namely, film boiling, partial film boiling (i.e. transition), nucleate boiling and convection. The maximum heat transfer occurs during the nucleate boiling stage. Experimental study shows that, the effective surface heat transfer coefficient varies more than two orders of magnitude with the temperature during the quenching. For quenching process simulation, accurate prediction of the time-temperature history and microstructure evolution within the part largely depends on the accuracy of the boundary condition supplied. The heat transfer coefficient is the most important boundary condition for process simulation. This study focuses on creating a database of heat transfer coefficients for various liquid quenchant-metallic alloy combinations through experimentation using three different quench probes. This database is a web-based tool for use in quench process simulation. It provides at-a-glance information for quick and easy analysis and sets the stage for a Decision Support System (DSS) and Data Mining for heat-treating process.

Effects of Heat Transfer Coefficients on Quenching Residual Stresses in 7055 Aluminum Alloy

2016 ◽  
Vol 877 ◽  
pp. 647-654 ◽  
Author(s):  
Ya Nan Li ◽  
Yong An Zhang ◽  
Xi Wu Li ◽  
Zhi Hui Li ◽  
Guo Jun Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Residual Stresses ◽  
Transfer Coefficient ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Water Flows ◽  
Quenching Process ◽  
7055 Aluminum Alloy ◽  
The Heat Transfer Coefficient

The quenching process can produce great residual stresses in 7055 aluminum alloy plates. The main factor that affects the quenching residual stresses is the heat transfer coefficient in the quenching process. In this paper, the heat transfer coefficients of spray quenching under different spray water flows were measured by using the inverse method, and the heat transfer coefficients of immersion quenching under different water temperatures were measured by the iterative method. The heat transfer coefficient increases as the spray water flow increases while decreases as the water temperature increases. The basic differences of water temperatures/spray water flows/quenching methods are the different heat transfer coefficients. According to the heat transfer coefficients results of immersion and spray quenching, an orthogonal test was carried out to study the effects of heat transfer coefficients in different temperature regions on the quenching residual stresses. The heat transfer coefficients in the range of 100oC ~200oC have a great influence on the quenching residual stresses, especially for the heat transfer coefficient near 150oC.

Heat transfer behavior during water spray quenching of 7xxx aluminum alloy plates

2021 ◽  
pp. 1-36
Author(s):  
Ning Fan ◽  
Baiqing Xiong ◽  
Zhihui Li ◽  
Yanan Li ◽  
Xiwu Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloy ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Nucleate Boiling ◽  
Spray Parameters ◽  
Spray Distance ◽  
Heat Transfer Behavior ◽  
Quenching Process ◽  
Transfer Behavior

Abstract The desired microstructure and mechanical properties of heat treatable 7xxx aluminum alloy can be achieved after spray quenching by controlling spray parameters. However, heat transfer behavior between specimen and quenchant is transient and complicated in quenching process. In this paper, a spray quenching system was utilized to quench for 7xxx aluminum alloy. The influence of spray parameters, including spray pressure and spray distance, on heat transfer behavior was examined and discussed. Heat flux and heat transfer coefficient were calculated by iterative method. The results indicated that the aluminum alloy experienced transition boiling, nucleate boiling and convection cooling regimes during spray quenching process. Heat transfer capability firstly increased and then decreased with the increasing of spray pressure or spray distance. A function of local heat transfer coefficient which is variable in specimen surface temperature, spray parameters and spatial location was constructed. Residual stress of 7xxx aluminum alloy plates was increased firstly and then slightly differed with the increase of volumetric flux.

6063 Aluminum Alloy Online Quenching Surface Heat Transfer Coefficient and the Temperature Field Simulation

2013 ◽  
Vol 446-447 ◽  
pp. 146-150
Author(s):  
Hui Wang ◽  
Hai Bo Yang
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloy ◽  
Temperature Field ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Maximum Heat ◽  
Maximum Heat Transfer ◽  
Jet Impact ◽  
Quenching Process ◽  
6063 Aluminum Alloy

For the 6063 aluminum alloy spray quenching process, respectively establish finite element model of upper, lower nozzle jet impact and water area and meshing in the Gambit. Import into fluent software for cooling numerical simulation, getting the upper and lower nozzle’s pressure contours , velocity contours , heat transfer coefficient curve and water area’s velocity contours and heat transfer coefficient curves. Analysis the various contours and the heat transfer coefficient along the aluminum plate surface radial distribution: upper nozzle’s heat transfer intensity is not in stationary point and near its both sides; Lower nozzle’s contours and heat transfer coefficient has a certain similarity with the upper nozzle, but the maximum heat transfer intensity is at stagnation point; Water area‘s heat transfer coefficient fall faster at the entrance and maintained at a constant value finally. Put heat transfer coefficient as a boundary condition into the ansys software to simulate the three dimensional temperature field of quenching process and analysis the temperature field contours in different time: the biggest speed is 36°C/s during the process of quenching, appearing in the high temperature range, namely deformation sensitive areas, therefore it most likely to occur deformation at the beginning of the quenching profiles.

Heat transfer coefficients for quenching process simulation

2004 ◽  
Vol 120 ◽  
pp. 521-528
Author(s):  
M. Maniruzzaman ◽  
R. D. Sisson
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Process Simulation ◽  
Nucleate Boiling ◽  
Film Boiling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Quenching Process

Quenching heat treatment in a liquid medium is a very complex heat transfer process. Heat extraction from the part surface occurs through several different heat transfer mechanisms in distinct temperature ranges, namely, film boiling, partial film boiling (i.e. transition), nucleate boiling and convection. The maximum heat transfer occurs during the nucleate boiling stage. Experimental study shows that, the effective surface heat transfer coefficient varies more than two orders of magnitude with the temperature during the quenching. For quenching process simulation, accurate prediction of the time-temperature history and microstructure evolution within the part largely depends on the accuracy of the boundary condition supplied. The heat transfer coefficient is the most important boundary condition for process simulation. This study focuses on creating a database of heat transfer coefficients for various liquid quenchant-metallic alloy combinations through experimentation using three different quench probes. This database is a web-based tool for use in quench process simulation. It provides at-a-glance information for quick and easy analysis and sets the stage for a Decision Support System (DSS) and Data Mining for heat-treating process.

scholarly journals Correlation of heat transfer coefficient in quenching process using ABAQUS

2018 ◽  
Author(s):  
Sandeep Kedarnath Davare ◽  
G. Balachandran ◽  
R. K. P. Singh
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Quenching Process
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