scholarly journals EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURE AND PERFORMANCE OF HIGH-VELOCITY AIR-FUEL SPRAYED WC-10Co4Cr COATINGS

2021 ◽  
Vol 55 (6) ◽  
Author(s):  
Yong Xue ◽  
Xuedong Zhou ◽  
Haijun Liu ◽  
Jishi Zhang ◽  
Jinsheng Ji ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Amorphous Phase ◽  
High Velocity ◽  
Wear Test ◽  
Treatment Temperature ◽  
Heat Treated ◽  
Original Coating

In this study a high-velocity air-fuel (HVAF) flame-sprayed WC-10Co4Cr coating was heat-treated at (240; 300; 400) °C for 2 h in an air atmosphere. The effect of the heat treatment on the hardness, fracture toughness, wear resistance, corrosion resistance, phase composition and microstructure behaviour of the coatings was investigated. It could be concluded from the X-ray diffraction (XRD) pattern that the phase of the coatings was mainly composed of tungsten carbide, an amorphous phase, a small amount of W2C and trace metal tungsten. However, the heat-treated coating had a small increase in W2C compared to the original coating, although the amount of amorphous phase did not decrease significantly. The results indicated that as the heat-treatment temperature increased, the hardness of the coating first increased and then decreased, while the fracture toughness increased. The polarization test confirmed that the heat-treated coating had higher corrosion resistance than the original coating. In addition, the results of the reciprocating friction and wear test indicated that small amounts of W2C strengthening phases were formed in the WC-10Co4Cr coating after heat treatment at 400 °C. This process did not eliminate many of the tougher Co and WC phases. Therefore, this coating had the best wear resistance among all the comparative coatings.

Characterization of Ni-P and Ni-P-Al2O3 Heat Treated Layers

2017 ◽  
Vol 1143 ◽  
pp. 26-31
Author(s):  
Lucica Balint ◽  
Gina Genoveva Istrate
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Treatment Temperature ◽  
Initial State ◽  
X Ray ◽  
Transmission Electron ◽  
Heat Treated ◽  
Before And After

Research has shown the relationship among hardness, usage and corrosion resistance Ni-P-Al2O3 composite coatings on steel support heat treated. The electroless strips were heat treated at 200°C, 300°C, 400°C, 500°C and 600°C. Further studies on corrosion, hardness and usage revealed changes in properties, compared to the initial state, both on the strips coated with Ni-P and the ones coated with Ni-P-Al2O3 composite. The samples have been studied before and after the heat treatment via Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Analysis (EDX) and X-Ray Diffraction (XRD). The results show that untreated Ni-P layers exhibit strong corrosion resistance, while hardness and usage increase with heat treatment temperature, with a peak at 400 °C. Using suspended particles co-deposition, led to new types of layers, some with excellent hardness and usage properties. Corrosion resistance increase with heat treatment. Coating layers can be adjusted to the desired characteristics, by selecting proper parameters for the expected specific results.

High Cr-Ni Cast Iron Base Deposits with Tantalum Carbide Particles Produced by Plasma Spraying

2014 ◽  
Vol 782 ◽  
pp. 563-566
Author(s):  
Yasuhiro Hoshiyama ◽  
Toshiaki Otani ◽  
Hidekazu Miyake
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Cast Iron ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Tantalum Carbide ◽  
Iron Base ◽  
Heat Treated ◽  
Plasma Sprayed ◽  
Carbide Particles

Fe-C-Ta-Cr-Ni alloy powder in diameter of 32-53 μm made by argon atomization was low-pressure plasma sprayed to produce high Cr-Ni cast iron base deposits with finely dispersed tantalum carbide particles. The as-sprayed deposit formed on a water-cooled substrate consisted of γFe, αFe and carbide. The fine precipitates of approximately 0.1 μm in the as-sprayed deposit formed on a water-cooled substrate were carbide. With increasing heat treatment temperature up to 1273 K, the carbide particles coarsened. The hardness of deposit decreases with increasing heat treatment temperature. The wear resistance of as-sprayed deposit formed on a non-cooled substrate was higher than that of the deposit heat-treated at 1273 K. The as-sprayed deposit and deposit heat-treated at 1273 K hade higher wear resistance than a commercial stainless steel.

Improvement in Wear Resistance of Nano WC-Co Coatings Fabricated by Detonation Gun Spraying

2007 ◽  
Vol 539-543 ◽  
pp. 1264-1269
Author(s):  
S.Y. Park ◽  
Moon Chul Kim ◽  
Chan Gyung Park
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Wear Resistance ◽  
Amorphous Phase ◽  
Phase Decomposition ◽  
Post Heat Treatment ◽  
Detonation Gun Spraying ◽  
Carbide Phases ◽  
Carbide Size ◽  
Detonation Gun

Nano structured WC-Co coatings with carbide size of 100−200nm were fabricated by detonation gun spraying. The fabricated nano coatings showed improved hardness and wear resistance compared to micron WC-Co coatings. Considerable phase decomposition of WC to W2C and amorphous phase in nano coatings was detected, which is known to degrade wear resistance of coatings. In order to improve the wear resistance of the coatings by recovering of dissociated carbide phases, post heat treatment was conducted in Ar environment at temperature range of 400−900°C. Harness, fracture toughness and wear resistance of nano coatings were significantly improved by post heat treatment. The improved properties were elucidated and discussed in terms of microstructure and phase compositions.

Effect of Heat Treatment on Microstructure and Corrosion Resistance of Ni-P/BN(h) Composite Coatings

2011 ◽  
Vol 239-242 ◽  
pp. 3362-3366
Author(s):  
Cheng Zhang Peng ◽  
Ling Ling Zhu ◽  
You Ming Chen
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Stable State ◽  
Amorphous Structure ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Pulse Electroplating ◽  
Heat Treated ◽  
Precipitated Phases

The Ni-P/ BN(h) composite coatings were prepared by pulse electroplating,and were heat treated at temperature of 200～400°C.The microstructure of the composite coatings was identified by X-ray diffraction,the corrosion behavior of the composite coatings in 3.5%NaCl and 10%H2SO4 solutions was investigated by the linear polarization measurements and scanning electron microscope (SEM).The results show that the as-deposited is an amorphous structure,the precipitated phases are Ni12P5 and Ni5P2 metastable state phases when heat treatment temperature is below 300°C,the precipitated phases is Ni3P stable state phase heat-treated at 400°C，the composite coating was crystallized in great degree.Both the as-deposited and heat treated composite coatings revealed best corrosion resistance in 3.5%NaCl and 10%H2SO4 solutions.

REPUBLIC HP 9-4-45

Alloy Digest ◽  
1965 ◽  
Vol 14 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Yield Strength ◽  
Heat Treating ◽  
Isothermal Heat Treatment ◽  
Temperature Performance ◽  
Heat Treated ◽  
Thin Walled

Abstract Republic HP 9-4-45 is a heat treated alloy steel capable of developing a yield strength of 250,000 psi with superior toughness characteristics. It is designed for sheet and thin-walled forged sections. It is also designed for heavy forging where an isothermal heat treatment is employed. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-179. Producer or source: Republic Steel Corporation, Titanium Division.

Wear and Corrosion Properties of Crystalline Ni-W Alloy Coatings Prepared by Electrodeposition

2016 ◽  
Vol 849 ◽  
pp. 671-676 ◽  
Author(s):  
Hao Chen ◽  
Xing Run Ren ◽  
Xue Hui Zhang ◽  
Jin Hui Li
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Steel Substrate ◽  
Medium Carbon Steel ◽  
Treatment Temperature ◽  
Corrosion Properties ◽  
Before And After ◽  
The Matrix ◽  
Corrosion Behaviors

Electroplating Ni-W coatings have been prepared on medium carbon steel substrate by using nickel sulphate and sodium tungstate as precursors. The microstructures, phase compositions and performances of the as-prepared coatings were analyzed by SEM, EDS, AFM, XRD, microhardness tester and wear tester, respectively. The surface morphologies after wearing were observed and the wear mechanism was discussed. The corrosion behaviors of the coatings before and after heat-treatments were evaluated by anodic polarization in 3.5% sodium chloride solution. The results show that no obvious flaws could be found in the Ni-W alloy coatings and there was a good bond with the matrix. The microhardness of the coatings increased with increasing heat treatment temperature, reaching its maximum value for heat treatment at 500°C, and then droped down. Wear resistance of the coatings was found to be better than that of 16 Mn steel and the heat treatment improved the hardness and wear resistance. The corrosion resistance of the heat-treated coatings increased with increasing the annealing temperature, and best corrosion resistance could be obtained at the temperature of 500°C.

Abrasive Wear on Heat-Treated Recycling Aluminium AA6061 of Various Reinforcement Materials through Powder Metallurgical Process

2017 ◽  
Vol 909 ◽  
pp. 15-20 ◽  
Author(s):  
Ahmed Sahib Mahdi ◽  
Mohammad Sukri Mustapa ◽  
Mohd Radzi Mohamed Yunus ◽  
Mohd Rasidi Ibrahim ◽  
Muhammad Irfan Ab Kadir ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Weight Loss ◽  
Wear Resistance ◽  
Wear Test ◽  
Metallurgical Process ◽  
Micro Hardness ◽  
Powder Metallurgical Process ◽  
Heat Treated ◽  
Pin On Disc ◽  
Is Value

The present study is aimed at investigating wear resistance of the heat treated of recycled aluminium type AA6061 for various reinforced methods (heat treatment reinforced by graphite and silica) using pin on disc method. In the study, weight loss value of the recycled chip of AA6061 was observed. Eight specimens were taken for the wear test. The results showed that the wear resistance increased for specimens treated by heat treatment. This increase in wear resistance is value of micro hardness which increased with the increase of the percentage of silica reinforcement. Thus, the weight loss decreased and the volume loss also decreased.

scholarly journals Corrosion resistance of UNS S31803 stainless steel welded joints

2018 ◽  
Vol 24 (2) ◽  
pp. 147
Author(s):  
Paolo Ferro ◽  
Jan-Olof Nilsson ◽  
Franco Bonollo
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Welded Joints ◽  
Heat Treatment Temperature ◽  
Experimental Tests ◽  
Treatment Temperature ◽  
Gas Composition ◽  
Shielding Gas ◽  
Heat Treated

<p>The corrosion resistance of duplex stainless steel welded joints is affected by different parameters such as filler metal chemical composition, heat input, shielding gas composition and post welding heat treatment temperature. In most cases such parameters interact with each other so that it is very difficult to foresee their effect on corrosion resistance of welded joints without specific experimental tests. In this work the best combination of shielding gas composition and post welding heat treatment temperature that guarantees the corrosion resistance of the joint according to ASTM  A932, method C, was found.  Two shielding gases were tested during welding, Ar (100%) and a mixture of Ar (87%), He (10%) and N (3%), while the solution temperatures were 1050 °C and 1070 °C.  It was found that only the samples welded with the mixture of Ar (87%), He (10%), N (3%) as shielding gas and solution heat treated at 1070 °C passed the corrosion test completely.</p>

CARPENTER CTS BD1 ALLOY

Alloy Digest ◽  
2013 ◽  
Vol 62 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Hardness ◽  
Heat Treating ◽  
Chromium Steel ◽  
Ball Bearings ◽  
Tool Steels ◽  
High Carbon ◽  
Heat Treated

Abstract Carpenter CTS BD1 alloy is a high-carbon chromium steel that provides stainless properties with high hardness and excellent wear resistance. In terms of hardness and wear resistance, this alloy behaves very similarly to tool steels. This alloy attains a hardness of 58–60 HRC when heat treated and has been used for cutlery, ball bearings, and small machinery parts subjected to high wear conditions. This datasheet provides information on composition and physical properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1160. Producer or source: Carpenter Specialty Alloys.

The Effects of T5 and T6 Heat Treatments on Wear Behaviour of AA6063 Alloy

2014 ◽  
Vol 33 (3) ◽  
pp. 231-237 ◽  
Author(s):  
Dursun Özyürek ◽  
Tansel Tunçay ◽  
Hasan Kaya
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Wear Test ◽  
Wear Behaviour ◽  
Precipitate Size ◽  
T6 Heat Treatment ◽  
Heat Treated ◽  
Pin On Disc ◽  
Aa6063 Alloy ◽  
Equipment Wear

AbstractIn this study, T5 heat treatment was applied to AA6063 alloy aged at 455 K for 2 hours after extrusion at 686 K. T6 heat treatment was also carried out by ageing at 455 K for 2 hours after solution heat treatment at 794 K for 1 hour. Heat treated T5 and T6 specimens were tested by pin-on-disc type wear equipment. Wear test was carried out by using 10, 20, 30 N loads and 400, 800, 1200 and 1600 m wear distance. T5 and T6 heat treated specimens were characterized with scanning electron microscope, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and hardness measurements. Worn surfaces of the specimens was also characterised with SEM. The results indicated that small and homogenously dispersed Mg2Si precipitates formed in AA6063 aluminium alloy with T6 heat treatment were compared to the T5 heat treatment. As a result of increment precipitate size, wear resistance decreased. T6 heat treated specimens showed higher hardness compared to the T5 heat treated specimens. In addition wear resistance and friction coefficient of both T5 and T6 heat treated specimens decreased with increasing applied load.

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