The Effect of Annealing Heat Treatment on the Microstructure and Macroscopic Properties of Kinetic-Sprayed Ta Coating Layer

2014 ◽  
Vol 893 ◽  
pp. 64-68 ◽  
Author(s):  
Myeong Ju Lee ◽  
Jae Sung Oh ◽  
Hyung Jun Kim ◽  
Ik Hyun Oh ◽  
Kee Ahn Lee
Keyword(s):  
Heat Treatment ◽  
Coating Layer ◽  
Average Particle Size ◽  
Average Particle ◽  
Spray Process ◽  
Kinetic Spray ◽  
Annealing Heat Treatment ◽  
Coating Layers ◽  
Ar Gas ◽  
Annealing Heat

The effect of annealing heat treatment on the properties of high-density tantalum coating layer produced by the kinetic spray process was investigated. Pure Ta powder with an average particle size of 24.35μm and irregular shape was used to produce the coating layer through kinetic spray process. The annealing heat treatments of tantalum coating layers were applied for an hour in an Ar gas atmosphere under temperatures of 800°C, 900°C, 1000°C, and 1100°C. The manufactured coating layers have hardness and porosity of 270 Hv and 0.28%, respectively, showing even higher density levels than the kinetic-sprayed Ta coating layers reported to date. As the annealing temperature increased, the hardness value of the coating layer reduced from 270 Hv to 183 Hv and the porosity was verified to have decreased from 0.28% to 0.18%. The result of the additional XPS analysis confirmed that the phase generated between particle interfaces with heat treatment was Ta2O5 oxide. Based on these results, improving methods to dense the Tantalum coating layer with kinetic spray process was considered.

Manufacturing and Macroscopic Properties of Warm Sprayed Cu-36at.%In-15at.%Ga Coating Layer

2016 ◽  
Vol 705 ◽  
pp. 155-160
Author(s):  
Gi Su Ham ◽  
Hyung Jun Kim ◽  
Dae Hoon Ji ◽  
Kee Ahn Lee
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Coating Layer ◽  
Pure Aluminum ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Average Particle ◽  
Post Heat Treatment ◽  
Spray Process

A Cu-36at.%In-15at.%Ga coating layer is manufactured using a warm spray process and ternary alloy powders. The powder used had a particle-size distribution of 5~22μm with a spherical shape and average particle size of 11.6μm. Pure aluminum plate was used as a substrate. As a result, a CIG coating layer with 120μm thickness was successfully obtained. In order to improve the density of the coating layer, post heat treatment was applied for 1 hour in each condition of 200, 300 and 400°C. Phase analysis of the powder initially used identified Cu9In4, Cu9Ga4 phases, and Cu9In4, Cu9Ga4, Cu3Ga phases were identified after warm spraying. As heat treatment was applied, porosity decreased from 0.98% (as sprayed) to 0.8% (400°C), showing an increase in density, and hardness also decreased from 304Hv (as sprayed) to 258Hv (400°C).

Densification and Purification of Cold Sprayed Ti Coating Layer by Using Annealing in Different Heat Treatment Environments

2012 ◽  
Vol 602-604 ◽  
pp. 1604-1608 ◽  
Author(s):  
Ji Sang Yu ◽  
Hyung Jun Kim ◽  
Ik Hyun Oh ◽  
Kee Ahn Lee
Keyword(s):  
Heat Treatment ◽  
Phase Analysis ◽  
Microstructural Evolution ◽  
Coating Layer ◽  
Titanium Coating ◽  
Heat Treated ◽  
Coating Layers ◽  
Ar Gas

This study investigated the densification and purification properties of cold sprayed titanium coating layer by using annealing in different heat treatment environments. The annealing was conducted at 600°C/1h and three kinds of environments of vacuum, Ar gas, and 5%H2+Ar mixture gas were controlled. Cold sprayed Ti coating layer (as sprayed) represented 6.7% of porosity and 228 HV of hardness. Regardless of gas environments, all of those thermally heat treated coating layers consisted of pure α-Ti and minimal oxide. Vacuum environment during heat treatment represented superior densification properties (3.8% porosity, 156.7 HV) to those of Ar gas (5.3%, 144.5 HV) and 5%H2+Ar mixture gas (5.5%, 153.1 HV). From the results of phase analysis (XRD, EPMA, SEM, EDS), it was found that vacuum environment during heat treatment could be effective for reducing oxide contents (purification) in the Ti coating layer. The characteristic of microstructural evolution with heat treatment found to be different at three different gas environments.

scholarly journals Effects of Full Annealing Heat Treatment on Long-term Creep Strength of 2.25Cr-1Mo Steel Welded Joint

2003 ◽  
Vol 21 (2) ◽  
pp. 195-203 ◽  
Author(s):  
Kazuhiro KIMURA ◽  
Takashi WATANABE ◽  
Hiromichi HONGO ◽  
Masayoshi YAMAZAKI ◽  
Jun-ichi KINUGAWA ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Creep Strength ◽  
Welded Joint ◽  
Annealing Heat Treatment ◽  
Full Annealing ◽  
Term Creep ◽  
Annealing Heat

Modeling of Annealing Heat Treatment Parameters for Zr Alloy Tube by ANN-Ga

2020 ◽  
Vol 1001 ◽  
pp. 207-211
Author(s):  
Xing Xing Tong ◽  
Xue Wen Tong
Keyword(s):  
Neural Network ◽  
Heat Treatment ◽  
Mechanical Property ◽  
Network Architecture ◽  
Heat Treatments ◽  
Annealing Heat Treatment ◽  
Alloy Heat ◽  
Artificial Neural Network Ann ◽  
Zr Alloy ◽  
Annealing Heat

In this paper, there are tow part of module for predicting the Annealing heat treatments of Zr tube. The artificial neural network (ANN) were used for relationship between mechanical property and annealing parameters. The genetic algorithm (GA) were used for Annealing heat treatments of Zr tube. The best ANN network architecture is 2-8-3, and the optimum values of momentum factor is 0.8 while the Crossover is also 0.8 by ANN-GA, which can be efficiently track the effect of annealing Heat treatment on properties for Zr-4 alloy. Keywords: Zr alloy, Heat Treatment, mechanical propert

Precipitates Formation in Ti-Ni Equiatomic Alloys due to Annealing Heat Treatment

2010 ◽  
Vol 643 ◽  
pp. 49-54 ◽  
Author(s):  
Carlos Augusto Nascimento Oliveira ◽  
Euclides Apolinário Cabral De Pina ◽  
Cezar Henrique Gonzalez ◽  
Carlos José de Araújo ◽  
U.S.L. Filho ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Martensitic Transformations ◽  
Smart Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metallurgical Investigation ◽  
Annealing Heat Treatment ◽  
Annealing Heat

The use of smart material such as Ti-Ni in actuators application requires an intense mechanical and metallurgical investigation to understand its behavior. This paper studies martensitic transformation using DSC and X-ray diffraction techniques to compare shape memory parameters in Ti-50.2%Ni (A1) and equiatomic Ti-50.0%Ni (A2) Alloys. The as as-received samples were submitted to annealing at 400°C and 500°C for 24 hours then quenched in at 25°C. The influence of heat treatment on martensitic transformations temperatures and the appearance of R-phase were analyzed using DSC and X-ray diffraction.

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