scholarly journals A Study on temperature field and spheroidizing annealing process in Bell-type annealing furnace

2016 ◽  
Author(s):  
Xibang Zhang ◽  
Ziying Liu ◽  
Fengqin Wang ◽  
Lin Zhao
Keyword(s):  
Temperature Field ◽  
Annealing Process ◽  
Annealing Furnace ◽  
Spheroidizing Annealing

Research on the Annealing Process of AISI4145H Steel

2011 ◽  
Vol 415-417 ◽  
pp. 825-830
Author(s):  
Zhen Yi Huang ◽  
Yi Qian Wang ◽  
You He Li ◽  
Ping Wang ◽  
Xiao Feng Zhang
Keyword(s):  
Heat Treatment ◽  
Production Efficiency ◽  
Physical Simulation ◽  
Processing Parameters ◽  
Black Box ◽  
Annealing Process ◽  
Holding Time ◽  
Production Costs ◽  
Annealing Furnace ◽  
New Process

Abstract. This paper had an improvement research on the annealing process of AISI4145H steel by changing the processing parameters of heat treatment in laboratory. An experimental physical simulation was conducted between 650 °C and 740 °C. The effect upon the hardness of AISI4145H steel under different temperature and holding time investigated. And the condition of Φ 150 mm AISI4145H steel that was heated and warmed up in an annealing furnace was tested by adopting a black box. Results showed that the Ac1 of AISI4145H steel was 757.2 °C and the Ac3 was 787.7 °C. By the annealed conditions that sample was heated at 710 °C for 1h, cooled to 500 °C in furnace and cooled in air in turn, we found its hardness was HRC 21.4 and meet the needs of industrial production. New process of the present work shortened holding time of workpiece, increased cooling rate of annealed, shortened the annealed time about 24 h, effectively increased production efficiency, and reduced production costs.

The Steady-State Model of Heating Process in Horizontal Continuous Annealing Furnace

2011 ◽  
Vol 233-235 ◽  
pp. 2428-2431
Author(s):  
Gang Zhou ◽  
Zhi Wen ◽  
Rui Feng Dou ◽  
Fu Yong Su ◽  
Xu Fang ◽  
...  
Keyword(s):  
Steady State ◽  
Physical And Mechanical Properties ◽  
Annealing Process ◽  
State Model ◽  
Heating Process ◽  
Continuous Annealing ◽  
Annealing Furnace ◽  
Heating Section ◽  
Steady State Model ◽  
New Varieties

The continuous annealing process of strip steel is aimed to archive the required physical and mechanical properties. During this process, strip temperature is of great importance for controlling metallurgical transformation and grain size. This paper describes the modeling of the heating process in a horizontal annealing furnace used for producing stainless steel. The steady-state model is designed to predict strip temperature in the heating section, so it can simulate the annealing process of new varieties of steel never been produces. The strip temperatures predicted by model well correspond to the field data. This confirms the correctness and accuracy of the model.

Numerical Simulation the Temperature Field of the Multi-Coil Batch during Annealing Process in Bell-Type Furnace

2012 ◽  
Vol 538-541 ◽  
pp. 637-641 ◽  
Author(s):  
Chun Li Mo ◽  
Qiang Li ◽  
Xu Ming Guo ◽  
Hao Wang
Keyword(s):  
Temperature Field ◽  
Steel Plate ◽  
Hydrogen Atmosphere ◽  
Annealing Process ◽  
Heat Radiation ◽  
Cooling Process ◽  
Steel Coil ◽  
Coil Temperature ◽  
Batch Annealing ◽  
Steel Coils

In this paper temperature field of multi-coil during batch annealing process in strong forced convective hydrogen atmosphere of Bell-type furnace was simulated, and the influences of heat transferring between steel coil and air flow under a given condition on the temperature field of the steel coil were studied. And then, the temperature field of a single and three coils steel plate were calculated during reheating, holding and cooling process according to the measured annealing curves. The simulated results show that the same trend of temperature in different steel coils. However, considering the heat radiation of steel coil, temperature variation in the topside of coil is higher than that in the bottom of coil.

Studies of Annealing Process in Severely Cold Drawn Pearlitic Steel Wires

2011 ◽  
Vol 682 ◽  
pp. 19-23
Author(s):  
Shi Feng Liu ◽  
Ga Liu ◽  
Bo Jian Wang ◽  
C.H. Ren ◽  
Xiao Li Shi
Keyword(s):  
Low Temperature ◽  
Annealing Temperature ◽  
Pearlitic Steel ◽  
Annealing Process ◽  
Partial Dissolution ◽  
Steel Wires ◽  
Spheroidizing Annealing ◽  
Two Stages

The effects of spheroidizing annealing process on SWRH72B heavily cold drawn pearlite steel wires were studied and the mechanisms of low-temperature spheroidizing annealing were discussed. The results show that, with increasing drawing strain, the spheroidizing annealing temperature and time decreased and uniformity of the spheroidizing increased; the mechanism of low-temperature spheroidizing annealing was different from the traditional one of heavily cold drawn pearlite steel wires. When the true strains were between 2.85 and 5.1, the spheroidizing process of carbide could be divided into two stages: partial dissolution of lamellar carbide, and the precipitation and accumulation of compulsory dissolved cementite. When the true strains were larger than 5.1, the spheroidizing process of carbide was only characterized by precipitation and accumulation of compulsory dissolved cementite.

scholarly journals Optimal Steady-State Temperature Field in an Experimental Annealing Furnace

2016 ◽  
Vol 49 (20) ◽  
pp. 214-219 ◽  
Author(s):  
L. Jadachowski ◽  
A. Steinboeck ◽  
A. Kugi
Keyword(s):  
Temperature Field ◽  
Steady State ◽  
Annealing Furnace ◽  
Steady State Temperature

Characteristics and Application of Temperature-Field Emitters

1975 ◽  
Vol 33 ◽  
pp. 144-145
Author(s):  
N. Tamura ◽  
T. Goto ◽  
Y. Harada
Keyword(s):  
Temperature Field ◽  
Electron Microscope ◽  
Field Emission ◽  
Resolving Power ◽  
High Brightness ◽  
Field Emitters ◽  
Emission Electron ◽  
Sufficient Stability ◽  
Scanning Electron ◽  
Illuminating System

On account of its high brightness, the field emission electron source has the advantage that it provides the conventional electron microscope with highly coherent illuminating system and that it directly improves the, resolving power of the scanning electron microscope. The present authors have reported some results obtained with a 100 kV field emission electron microscope.It has been proven, furthermore, that the tungsten emitter as a temperature field emission source can be utilized with a sufficient stability under a modest vacuum of 10-8 ~ 10-9 Torr. The present paper is concerned with an extension of our study on the characteristics of the temperature field emitters.

Multiple-fracturing and viewing of the same frozen sample at different depths using a low temperature FESEM

1996 ◽  
Vol 54 ◽  
pp. 820-821
Author(s):  
M.V. Parthasarathy ◽  
C. Daugherty
Keyword(s):  
Temperature Field ◽  
Low Temperature ◽  
Field Emission ◽  
Multiple Fracture ◽  
Precise Control ◽  
Cold Stage ◽  
Different Depths ◽  
Transfer Device

The versatility of Low Temperature Field Emission SEM (LTFESEM) for viewing frozen-hydrated biological specimens, and the high resolutions that can be obtained with such instruments have been well documented. Studies done with LTFESEM have been usually limited to the viewing of small organisms, organs, cells, and organelles, or viewing such specimens after fracturing them.We use a Hitachi 4500 FESEM equipped with a recently developed BAL-TEC SCE 020 cryopreparation/transfer device for our LTFESEM studies. The SCE 020 is similar in design to the older SCU 020 except that instead of having a dedicated stage, the SCE 020 has a detachable cold stage that mounts on to the FESEM stage when needed. Since the SCE 020 has a precisely controlled lock manipulator for transferring the specimen table from the cryopreparation chamber to the cold stage in the FESEM, and also has a motor driven microtome for precise control of specimen fracture, we have explored the feasibility of using the LTFESEM for multiple-fracture studies of the same sample.

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