Hardness and wear resistance improvement of surface composite layer on Ti–6Al–4V substrate fabricated by powder sintering

2010 ◽  
Vol 31 (5) ◽  
pp. 2670-2675 ◽  
Author(s):  
Rui-Hua Hu ◽  
Jae-Kyoo Lim
Keyword(s):  
Wear Resistance ◽  
Composite Layer ◽  
Surface Composite ◽  
Powder Sintering ◽  
Surface Composite Layer ◽  
Resistance Improvement

Study on Friction Property of the Ni/ZrO2 Composite Infiltrated Layer on Cast Steel Surface under Dry Fraction

2014 ◽  
Vol 1055 ◽  
pp. 73-77
Author(s):  
Xian Ming Sun ◽  
Gui Rong Yang ◽  
Lei Wei ◽  
Yu Lan Liu
Keyword(s):  
Wear Resistance ◽  
Steel Surface ◽  
Cast Steel ◽  
Composite Layer ◽  
Maximum Hardness ◽  
Friction Property ◽  
Casting Method ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
Gradient Change

The surface composite layer Ni/ZrO2 on the ZG45 cast steel surface was fabricated through vacuum infiltration casting method. This paper researched on the Ni/ZrO2 composite infiltrated layer morphology, hardness and the friction property under fry friction. The results show that the main phase structure of the layer is ZrO2, Cr2B, NiB and FeNi. The macrohardness of the layer is HRC60~64. The micohardness presents gradient change. The maximum hardness appears at subsuface. The 10% ZrO2 composite infiltrated layer wear resistance increases 10 times and 15% ZrO2 composite infiltrated layer increases 22.6 times than ZG45 under the 100N load. The 10% ZrO2 composite infiltrated layer wear resistance increases 8.5 times and 15% ZrO2 composite infiltrated layer increases 21.9 times under 250N load. The wear resistance has greatly improved.

MICROSTRUCTURE AND WEAR RESISTANCE OF CHROMIUM CARBIDE COATING IN SITU SYNTHESIZED BY VEB

2014 ◽  
Vol 21 (05) ◽  
pp. 1450065 ◽  
Author(s):  
BINFENG LU ◽  
LIPING LI ◽  
FENGGUI LU ◽  
XINHUA TANG
Keyword(s):  
Wear Resistance ◽  
Composite Layer ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Powder Mixtures ◽  
X Ray ◽  
Surface Composite ◽  
Composite Layers ◽  
Surface Composite Layer

In this paper, ( Cr , Fe )7 C 3( M 7 C 3)/γ- Fe composite layer has been in situ fabricated on a low carbon steel surface by vacuum electron beam irradiation (VEB). Three kinds of powder mixtures were placed on a low carbon steel substrate, which was then irradiated with electron beam in vacuum condition. The microstructure and wear resistance of the composite layers has been studied by means of optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), microhardness tester and tribological tester. The chemical composition of all specimens were carefully analyzed using energy-dispersive X-ray spectroscopy (EDAX) technique. Depending on three different powder mixtures, hypereutectic and hypoeutectic microstructures were obtained on surface composite layers. No pores and cracks were found on the coatings. The amount of carbides formed in the surface composite layer was mainly determined by carbon concentration. The microstructure close to the fusion line was largely primary austenite dendrite. The hardness and wear resistance of the surface composite layer has been greatly improved due to the extensive distribution of carbides.

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.

Research on Friction Property of the Ni/ZrO2 Composite Infiltrated Layer on Cast Steel Surface under High Temperature

2014 ◽  
Vol 687-691 ◽  
pp. 4299-4302
Author(s):  
Xian Ming Sun ◽  
Gui Rong Yang ◽  
Lei Wei ◽  
Yu Lan Liu
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Steel Surface ◽  
Cast Steel ◽  
Composite Layer ◽  
Friction Property ◽  
Surface Composite Layer ◽  
Change Trend ◽  
Better Than

The surface composite layer Ni/ZrO2 on the ZG45 cast steel surface was fabricated through vacuum infiltration casting method. This paper researched on the Ni/ZrO2 composite infiltrated layer morphology, hardness and the friction property under fry friction. The results show that the added of the ZrO2 ceramic particles increase the composite infiltrated layer hardness and the wear resistance. The 15% ZrO2 composite infiltrated layer wear resistance is better than the 10% ZrO2 composite infiltrated layer. Different ZrO2 contents have same change trend. The friction coefficient decreases with the temperature increasing. The 10% ZrO2 friction coefficient changes obviously with the temperature increasing. The 15% ZrO2 friction coefficient changes evener than the 10% ZrO2 but the protection of friction and wear is more obvious.

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