Erosive Wear of WC‐Co Coating

AbstractTo produce realistic test specimens with realistic flaws, it is necessary to develop appropriate procedure for corrosion flaw production. Tested specimens are made from steels commonly used in power plants, such as carbon steels, stainless steels and their dissimilar weldments. In this study, corrosion damage from NaCl water solution and NaCl water mist are compared. Specimens were tested with and without mechanical bending stress. The corrosion processes produced plane, pitting and galvanic corrosion. On dissimilar weldments galvanic corrosion was observed and resulted to the deepest corrosion damage. Deepest corrosion flaws were formed on welded samples. The corrosion rate was also affected by the solution flow in a contact with the specimens, which results in a corrosion-erosive wear. Produced flaws are suitable as natural crack initiators or as realistic corrosion flaws in test specimens.

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DESTABILIZATION HEAT TREATMENT EFFECT ON EROSIVE WEAR CHARACTERISTICS OF HIGH CHROMIUM WHITE CAST IRON

Kufa Journal of Engineering ◽

10.30572/2018/kje/090204 ◽

2018 ◽

Vol 09 (02) ◽

pp. 45-56 ◽

Cited By ~ 1

Author(s):

Israa Yousif ◽

◽

Ali Ataiwi ◽

Keyword(s):

Heat Treatment ◽

Cast Iron ◽

Treatment Effect ◽

White Cast Iron ◽

Erosive Wear ◽

High Chromium ◽

Wear Characteristics

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Fullerene-like Nanoparticles of WS2 as a Promising Protection from Erosive Wear of Gun Bore Nozzles

Current Nanoscience ◽

10.2174/1573413715666181217115448 ◽

2020 ◽

Vol 16 (1) ◽

pp. 62-70 ◽

Cited By ~ 1

Author(s):

Narimane Rezgui ◽

Danica Simić ◽

Choayb Boulahbal ◽

Dejan Micković

Keyword(s):

Mass Loss ◽

Solid Lubricant ◽

Erosive Wear ◽

Mechanical Resistance ◽

Protective Function ◽

Protective Layers ◽

Total Mass Loss ◽

Mass Losses ◽

Before And After ◽

Tube Life

Background: Erosive wear causes increase in the bore diameter of firearms barrels and nozzles. Most responsible factors for this erosion are friction and heat generated during the shot. Protection from erosive wear is very important for gun tube life cycle, and various protection methods are used: adding phlegmatizers in gunpowder composition or applying protective layers on the gun bore inner surface. Objective: In this research, a possibility is examined to protect the surface of a nozzle exposed to gunpowder erosion applying a layer of tungsten disulfide fullerene-like nanoparticles, IF-WS2, known as outstanding solid lubricant of a great mechanical resistance. Methods: Nanoparticles on the nozzle surface before and after the gunfire tests were observed using scanning electron microscopy/energy dispersive X-ray spectroscopy. Gunfire tests were performed on designed erosion device. Temperatures in the defined position near the affected surface were measured with thermocouples and compared for the nozzles with and without nanoprotection, as well as the nozzle mass loss after each round. Results: For the sample with IF-WS2 lower temperatures after firing and lower mass losses were observed. Mass loss after first round was 25.6% lower for the sample with protective nanoparticles layer, and the total mass loss was about 5% lower after five rounds. After the first round the nozzle without IF-WS2 was heated up to a temperature which was for 150.8°C higher than the nozzle with IF-WS2. Conclusion: Protective function of IF-WS2 is the most pronounced for the first round. The observed results encourage its further application in firearms gun bores protection.

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