Journal
MATERIALS
Volume 14, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/ma14206066
Keywords
PPTAW; cladding; deposition; impact strength; brittle fracture strength; tungsten carbide; titanium carbide; titanium diboride; synthetic polycrystalline diamond
Categories
Funding
- Silesian University of Technology Rector's habilitation grant [10/050/RGH_20/1006, 10/050/BKM21/1018]
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This study used powder plasma-transferred arc welding to produce metal matrix composite layers, and evaluated their resistance to cracking under dynamic loading through Charpy hammer impact tests. The interactions between ceramic particles and the metal matrix significantly influenced the formation and properties of the composite layers. Adjusting the particle size and composite density can enhance fracture toughness.
This article is the last of a series of publications included in the MDPI special edition entitled Innovative Technologies and Materials for the Production of Mechanical, Thermal and Corrosion Wear-Resistant Surface Layers and Coatings . Powder plasma-transferred arc welding (PPTAW) was used to surface metal matrix composite (MMC) layers using a mixture of cobalt (Co3) and nickel (Ni3) alloy powders. These powders contained different proportions and types of hard reinforcing phases in the form of ceramic carbides (TiC and WC-W2C), titanium diboride (TiB2), and of tungsten-coated synthetic polycrystalline diamond (PD-W). The resistance of the composite layers to cracking under the influence of dynamic loading was determined using Charpy hammer impact tests. The results showed that the various interactions between the ceramic particles and the metal matrix significantly affected the formation process and porosity of the composite surfacing welds on the AISI 4715 low-alloy structural steel substrate. They also affected the distribution and proportion of reinforcing-phase particles in the matrix. The size, shape, and type of the ceramic reinforcement particles and the surfacing weld density significantly impacted the brittleness of the padded MMC layer. The fracture toughness increased upon decreasing the particle size of the hard reinforcing phase in the nickel alloy matrix and upon increasing the composite density. The calculated mean critical stress intensity factor K-Ic of the steel samples with deposited layers of cobalt alloy reinforced with TiC and PD-W particles was 4.3 MPa.m12 higher than that of the nickel alloy reinforced with TiC and WC-W2C particles.
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