The formation features of the surface composite layer by laser-powder injection of tungsten monocarbide particles into a matrix from carbon steel

2021 ◽  
pp. 1-5
Author(s):  
A. G. Grigoryants ◽  
I. N. Shifanov ◽  
R. S. Tretyakov ◽  
A. I. Misyurov ◽  
N. A. Smirnova ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Composite Layer ◽  
Powder Injection ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
Tungsten Monocarbide

The Bending Behavior of Surface Composite Layer Ni/WC Fabricated through Vacuum Infiltration Casting

2011 ◽  
Vol 189-193 ◽  
pp. 385-390 ◽  
Author(s):  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Ying Ma ◽  
Yuan Hao
Keyword(s):  
Transition Layer ◽  
Raw Materials ◽  
Processing Condition ◽  
Composite Layer ◽  
Gray Iron ◽  
Vacuum Infiltration ◽  
Casting Technique ◽  
Three Point Bending ◽  
Surface Composite ◽  
Surface Composite Layer

Ni/WC surface infiltrated composite layer was fabricated on gray iron substrate through vacuum infiltration casting technique using Ni-based powder and WC particles with different content as raw materials. The compact infiltrated composite layer was obtained on the condition of appropriate choice of processing condition such as pouring temperature, preheating temperature, thickness of preform and the grain size of powder. The infiltrated layer includes surface composite layer and transition layer, and the thickness of transition layer decreases with the increasing content of WC. Three-point bending tests were performed to investigate the mechanical and metallurgical properties of the surface infiltrated composite layer. It was found that load-holding circumstance appeared for specimen with infiltrated layer during the process of three-point bending, and there was no this circumstance for substrate during bending process. The load and displacement decreased with the increasing content of WC when the load-holding circumstance happened. The fracture extended to the substrate for all specimens with surface infiltrated composite layer, and the fracture form was similar for all specimens with different WC content. The WC particles were the source of micro-crack for surface infiltrated layer, and the graphite was the source of micro-crack for gray iron substrate.

Microstructure and Hardness of Surface Composite Layer Fabricated by Evaporative Pattern Casting Technology

2012 ◽  
Vol 538-541 ◽  
pp. 302-305
Author(s):  
Ran Yang Zhang ◽  
Gang Yao Zhao ◽  
Yue Chen
Keyword(s):  
Electron Microscope ◽  
Cast Steel ◽  
Composite Layer ◽  
Steel Matrix ◽  
X Ray ◽  
Surface Composite ◽  
Casting Technology ◽  
Surface Composite Layer ◽  
Scanning Electron ◽  
Evaporative Pattern Casting

Surface composite layer was fabricated on the cast steel matrix using the evaporative pattern casting (EPC) technology. The pre-coating with WC and Cr-Fe particles as raw reinforcements was reacted with matrix and formed the composite layer. Then, the microstructure and hardness of surface composite layer were investigated by Scanning Electron Microscope (SEM), Olympus Microscope (OM), Energy Dispersive X-ray Spectroscopy (EDAX) and Rockwell Apparatus. The results show that the composite layer can be divided into transitive layer and penetrated layer, and the component analysis shows that the microstructure distribution of the penetrated layer is homogeneous.

FABRICATION OF SURFACE COMPOSITE BY FRICTION STIR PROCESSING USING A NOVEL DIRECT PARTICLE INJECTION TOOL

2019 ◽  
Vol 26 (04) ◽  
pp. 1850182
Author(s):  
P. MUTHUKUMAR ◽  
S. JEROME ◽  
R. JOHN FELIX KUMAR ◽  
S. PRAKASH
Keyword(s):  
Friction Stir Processing ◽  
Composite Layer ◽  
Aluminum Matrix ◽  
Homogeneous Distribution ◽  
Particle Injection ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
The Matrix ◽  
The Impact

In this work, aluminum/titanium carbide (Al/TiC) surface composite has been fabricated by friction stir processing using a novel modular Direct Particle Injection Tool (DPI–FSP). The tool has a unique feature wherein the TiC particles have been transferred from the tool itself by spring adjusted plunger movement into the matrix. The microstructural observations from optical and scanning electron microscope (SEM)-EDS results revealed the homogeneous distribution of particles in the stirred zone (SZ) and the thickness of the formed surface composite layer (SCL) is approximately 0.34[Formula: see text]mm. X-ray diffraction results confirmed that the particles are reinforced in the aluminum matrix, and no intermetallics have been formed in the composite. The microhardness of composite was increased from 68 to 135[Formula: see text]Hv, and the impact test results showed that the toughness was almost comparable to that of the base metal.

Effect of Compositions of Penetrating Agents on the Microstructure of Tungsten-Chromium Surface Composite

2013 ◽  
Vol 634-638 ◽  
pp. 1906-1909
Author(s):  
Li Xiao Jia
Keyword(s):  
Tungsten Carbide ◽  
Composite Layer ◽  
High Carbon ◽  
Penetration Process ◽  
Surface Composite ◽  
Metallurgical Bonding ◽  
Surface Composite Layer ◽  
And Tungsten

Influence of the composition of cast penetration agents on the microstructure of Tungsten-Chromium surface composite layer was researched by conventional cast penetration process with main cast penetration agents of WC and high carbon ferro-chrome. The result is shown that a certain thickness composite layer metallurgical bonding with matrix is formed on the surface of ZG230-450 cast under the condition of experiment. The relative quantity of chrome carbide and tungsten carbide in surface composite layer changes with the increase of WC and the shape of tungsten carbide changes from discontinuous reticulation into sunflower and then into banding shape with the increase of WC and high carbon ferro-chrome.

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