In-situ particle temperature, velocity and size measurements in the spray forming process

2002 ◽  
Vol 326 (1) ◽  
pp. 154-164 ◽  
Author(s):  
Michaela Krauss ◽  
Dirk Bergmann ◽  
Udo Fritsching ◽  
Klaus Bauckhage
Keyword(s):  
Particle Temperature ◽  
Spray Forming ◽  
Forming Process

In situ Temperature Measurement During Spray Forming of A2-tool Steel and Axisymmetric Two-dimensional Analysis

2000 ◽  
Vol 15 (8) ◽  
pp. 1669-1678 ◽  
Author(s):  
B. C. Moon ◽  
Z. H. Lee ◽  
D. R. White ◽  
E. J. Lavernia
Keyword(s):  
Experimental Data ◽  
Temperature Measurement ◽  
Tool Steel ◽  
Video Camera ◽  
Spray Forming ◽  
Cooling Curve ◽  
Two Dimensional ◽  
Forming Process ◽  
Infrared Video

An in situ temperature measurement was performed during spraying of A2-tool steel, and the results were used to verify an axisymmetric two-dimensional computer simulation program, which was developed for the prediction of shape and temperature variation in a spray-forming process. A thin thermocouple was placed inside of the chamber in advance and brought to the surface of the deposit during spraying. The temperature was then recorded. The surface temperature of the deposit was also measured by an infrared video camera. The emissivity of the surface of A2-tool steel during spraying was determined to be 0.23 through comparison of the temperatures measured by the thermocouple with the ones measured by the infrared video camera. The heat transfer coefficient at the top surface was estimated by comparing the calculated results with the experimental data. The cooling curve predicted on the basis of the numerical simulation showed good agreement with the experimental data.

In-Situ, Real Time Diagnostics in the Spray Forming Process

2017 ◽  
pp. 221-263
Author(s):  
Pooya Delshad Khatibi ◽  
Hani Henein ◽  
Udo Fritsching
Keyword(s):  
Real Time ◽  
Spray Forming ◽  
Forming Process

Research on Preparation of Al-Fe-V-Si Alloy Enhanced by In-Situ TiC Particles

2005 ◽  
Vol 475-479 ◽  
pp. 2857-2860
Author(s):  
Bao Hong Zhu ◽  
Yong'an Zhang ◽  
Bai Qing Xiong ◽  
Hong Wei Liu ◽  
Li Kai Shi
Keyword(s):  
Room Temperature ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Spray Forming ◽  
Forming Process ◽  
Heat Resistant ◽  
Lower Temperature ◽  
In Situ Tic ◽  
Better Than

Heat-resistant Al-Fe-V-Si aluminum alloys enhanced by in-situ TiC particles have been prepared by spray forming process with suitable process parameters. Research results show that the microstructure of as-deposited alloy is fine and homogeneous. In-situ TiC particles prevent the unsteady phases from coming into being. On the other hand, the TiC particles increase the volume fraction of heat-resistant phases. So the mechanical properties of the enhanced alloy by in-situ TiC particles are better than that of Al-Fe-V-Si alloy without TiC particles. The hot extrusion temperature is also an important parameter to understand. Under the permission, it is better to extrude the alloy at lower temperature. The tensile strength of the alloy without TiC particles is about 435MPa at room temperature and is about 204MPa at 350°C. However, when the alloy is enhanced by in-situ TiC particles, the strength of alloy is about 482MPa at room temperature and is about 224MPa at 350°C temperature.

Effect of TiC Particles on Microstructure and Properties of Al-Fe-V-Si Alloy

2014 ◽  
Vol 543-547 ◽  
pp. 3725-3728
Author(s):  
Rong Hua Zhang ◽  
Biao Wu
Keyword(s):  
Room Temperature ◽  
Volume Fraction ◽  
Hot Extrusion ◽  
Spray Forming ◽  
Forming Process ◽  
Heat Resistant ◽  
Lower Temperature ◽  
In Situ Tic ◽  
Better Than

Heat-resistant Al-Fe-V-Si aluminum alloys enhanced by in-situ TiC particles have been prepared by spray forming process with suitable process parameters. Research results show that the microstructure of as-deposited alloy is fine and homogeneous. In-situ TiC particles prevent the unsteady phases from coming into being. On the other hand, the TiC particles increase the volume fraction of heat-resistant phases. So the mechanical properties of the enhanced alloy by in-situ TiC particles are better than that of Al-Fe-V-Si alloy without TiC particles. The hot extrusion temperature is also an important parameter to understand. Under the permission, it is better to extrude the alloy at lower temperature. The tensile strength of the alloy without TiC particles is about 435MPa at room temperature and is about 204MPa at 350°C. However, when the alloy is enhanced by in-situ TiC particles, the strength of alloy is about 482MPa at room temperature and is about 224MPa at 350°C temperature.

sPreparation of ZrO 2 beads by an improved micro‐droplet spray forming process

2021 ◽  
Author(s):  
Jun Chen ◽  
Wan‐Qing Xue ◽  
Chang‐Ming Xu ◽  
Pai‐Feng Luo ◽  
Ji‐Gui Cheng ◽  
...  
Keyword(s):  
Spray Forming ◽  
Forming Process ◽  
Droplet Spray

Study on Nitridation Behavior of Mg-Ca Alloy under Nitrogen

2011 ◽  
Vol 415-417 ◽  
pp. 1127-1131
Author(s):  
Xiao Xia Yang ◽  
Dun Qiang Tan ◽  
Dong Fei Xiao ◽  
Yi Jie Zhan
Keyword(s):  
Magnesium Alloy ◽  
Profile Analysis ◽  
Surface Film ◽  
Spray Forming ◽  
Holding Time ◽  
Mg Alloy ◽  
Nitride Film ◽  
Forming Process ◽  
Small Cracks

To study the ignition-proof behavior in the spray deposited magnesium alloy with nitrogen as atomizing gas, SEM and XRD were employed to study the morphology and elements profile of nitride film formed on the Mg-5Ca alloy melt in different conditions, and the ignition proof principle was also analyzed preliminarily. The results indicated that under ordinary nitrogen (99.5%), a layer of smooth and continuous nitride film was formed on the surface of Mg-5Ca alloy after sintered at 740°C for 2 hours, and with the increasing of temperature and holding time, small cracks and cavities appeared locally on the surface film. The surface film was mainly composed of CaO、MgO、Ca3N2and Mg3N2.The profile analysis of the nitride film indicated that Ca element collected on the surface of the nitride film, and a multiple film was formed which filled the loose and holes of single film, avoided the burning of Mg alloy during spray forming process.

Modeling of Flow Fields of Different Delivery Chamfers in Spray Forming Process

2014 ◽  
Vol 789 ◽  
pp. 554-559
Author(s):  
Yang Liu ◽  
Zhou Li ◽  
Guo Qing Zhang ◽  
Wen Yong Xu
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
Fluid Dynamic ◽  
Metal Flow ◽  
Spray Forming ◽  
Operating Pressure ◽  
Delivery Tube ◽  
Forming Process ◽  
Atomization Process ◽  
Sharp Point

The computational fluid dynamic (CFD) software was used to calculate the velocity field in atomization chamber of spray forming equipment. The relationship between melt flow rates, gas aspiration of the atomizer and operating pressure are complex, and the above mentioned parameters are closely related to the atomization process. The influences of different delivery chamfers on gas flow field, which is determined by atomizer structure, were analyzed. Using K-epsilon model with a symmetrical domain, the gas dynamic of different delivery chamfer conditions were investigated. The results indicate that the sharp point of delivery tube causes detachment of flow field, and 56°, 45° and 34° chamfer conditions have same diffusion angle. Gas was aspirated from delivery tube when chamfer was 0°, which is beneficial to liquid metal flow in atomization process.

Study on FGH95 Superalloy Prepared by Spray Forming

2011 ◽  
Vol 337 ◽  
pp. 434-438
Author(s):  
Yi Xu ◽  
Shu Qin
Keyword(s):  
Technological Parameter ◽  
Nonmetallic Inclusions ◽  
Preparation Method ◽  
Spray Forming ◽  
Forming Process ◽  
Cylindrical Billet ◽  
Phase Size ◽  
The Difference ◽  
Cooling Velocity ◽  
Fgh95 Superalloy

FGH95 superalloy cylindrical billet was prepared by spray forming, The yield is 73.6%, porosity is 0.6%, the oxygen content is only 20ppm. Spray forming preparation method and technological parameter were illustrated. The microstructure on the different positions of billet were observed. The results show that the difference of γ′ phase size, feature and distribution depend on different cooling velocity and local temperature difference during the spray forming process. SEM of nonmetallic inclusions were observed, and XPS of nonmetallic inclusions, nozzle and adhesive were analysed, the results show that the nonmetallic inclusions were from nozzle and adhesive.

Mg–Cu–Gd layered composite plate synthesized via the spray forming process

2008 ◽  
Vol 477 (1-2) ◽  
pp. 58-62 ◽  
Author(s):  
K.F. Chang ◽  
M.-L.T. Guo ◽  
R.H. Kong ◽  
Chi Y.A. Tsao ◽  
J.C. Huang ◽  
...  
Keyword(s):  
Composite Plate ◽  
Spray Forming ◽  
Layered Composite ◽  
Forming Process

Effects of Atomizing Gas on Microstructural Characteristics and Mechanical Properties of Spray Formed High Si Steels

2009 ◽  
Vol 620-622 ◽  
pp. 57-60
Author(s):  
Je Sik Shin ◽  
Bong Hwan Kim ◽  
J.G. Lee ◽  
Seung Y. Shin ◽  
Gwang Bo Choi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spray Forming ◽  
Forming Process ◽  
Microstructural Characteristics ◽  
Steel Sheets ◽  
Conventional Ingot ◽  
Cold Workability ◽  
Ingot Cast

In order to investigate the feasibility of spray forming process for production of high Si steel sheets, 4.8~6.4%Si steels were prepared by spray forming process using N2 and Ar gases and their cold workability was compared with that of conventional ingot cast samples. Atomizing gas affected significant effect on deposit features, microstructural characteristics and mechanical properties of the spray formed high Si steels.

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