The Microstructure of Ni/ZrO2 Infiltrated Composite Layer

2011 ◽  
Vol 314-316 ◽  
pp. 236-239
Author(s):  
Xian Ming Sun ◽  
Jian Li ◽  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Ying Ma
Keyword(s):  
Solid Solution ◽  
Transition Layer ◽  
Raw Materials ◽  
Steel Substrate ◽  
Cast Steel ◽  
Composite Layer ◽  
Micro Hardness ◽  
Casting Technology ◽  
Surface Composite Layer ◽  
And Diffusion

The Ni/ZrO2 composite powder was used as raw materials to fabricate the surface infiltrated composite layer on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicated that the infiltrated composite layer included surface composite layer, Ni-based alloying layer and diffusion transition layer. The thickness of diffusion transition layer deceased with the increasing thickness of preform. The surface infiltrated composite layer was composed of ZrO2 ceramic particles, Cr2B and NiB intermetalic compounds as well as Ni-based solid solution. The Ni-based solid solution and Fe-based solid solution was the main composition for diffusion transition layer. The change of micro-hardness of surface infiltrated composite layer presents gradient from surface of infiltrated layer to substrate.

The Microstructure of Ni-Based Surface Infiltrated Layer on Cast Steel Substrate

2011 ◽  
Vol 117-119 ◽  
pp. 1133-1136
Author(s):  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Ying Ma ◽  
Yuan Hao
Keyword(s):  
Solid Solution ◽  
Intermetallic Compound ◽  
Raw Materials ◽  
Steel Substrate ◽  
Cast Steel ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Casting Technique ◽  
Gradient Change ◽  
And Diffusion

The Ni-based alloying powder was successfully used as the raw materials for fabricating surface infiltrated layers on cast steel ZG45 substrate through a vacuum infiltration casting technique (VICT). The microstructures of surface Ni-based infiltrated layer, the micro-hardness distribution are investigated. The infiltrated layer includes three areas that are surface part-melting area, melting completely fusion area and diffusion solid solution area. The main composition of surface infiltrated layer was intermetallic compound Cr2B，NiB and solid solution. The main phase of transition layer was solid solution. The micro-hardness of Ni-based infiltrated layer presented gradient change from surface infiltrated layer to substrate. The average micro-hardness was about 550HV.

The Research on Wear Performance at Elevated Temperature of Ni-Based Infiltrated Layer

2010 ◽  
Vol 154-155 ◽  
pp. 1375-1378
Author(s):  
Gui Rong Yang ◽  
Xian Ming Sun ◽  
You He Zhou ◽  
Wen Ming Song ◽  
Ying Ma ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Raw Materials ◽  
Steel Substrate ◽  
Cast Steel ◽  
Wear Property ◽  
Low Temperature Oxidation ◽  
Wear Performance ◽  
Temperature Oxidation ◽  
Casting Technology ◽  
And Diffusion

The Ni-based alloy was used as raw materials to fabricate the surface infiltrated layer with 1-4mm thickness on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicate that the infiltrated layer included surface melting and sintering layer, metallurgical fusion layer and diffusion layer. Wear property was investigated under different temperature conditions such as room temperature, 150°C, 300°C and 450°C. The results indicated that the abrasion volume of infiltrated layer was near to third of that of substrate, and it was nearly half of the substrate. This illuminated that the infiltrated had excellent wearable property. The adherence and fatigue abrasion was the main wear mechanism under low temperature. Oxidation abrasion and adherence dominated the wearing process under elevated temperature.

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.

scholarly journals Description Of Alloy Layer Formation On A Cast Steel Substrate

2015 ◽  
Vol 60 (3) ◽  
pp. 2367-2372 ◽  
Author(s):  
J. Szajnar ◽  
A. Dulska ◽  
T. Wróbel ◽  
C. Baron
Keyword(s):  
Steel Substrate ◽  
Cast Steel ◽  
Solidus Temperature ◽  
Alloy Layer ◽  
Layer Formation ◽  
High Carbon ◽  
Preceding Step ◽  
Chromium Cast Iron ◽  
And Diffusion ◽  
Liquidus Temperatures

Abstract A description of alloy layer formation on a steel substrate is presented. Two types of formation are considered: diffusion of carbon and chromium into the solid from the pad in the direction of the cast steel within the FeCrC (grains) and diffusion in a layer of liquid chromium cast iron formed in a preceding step. The influence of silicon in the pad on the pad’s transformation into the liquid is also examined. Solidus and liquidus temperatures of high carbon ferrochromium are determined. The larger the content of Si is used in the experiment, the lower the solidus temperature of the FeCrC alloy is observed. This results from the higher intensity of the elements’ diffusion and faster formation of the liquid.

The High Temperature Property of Ni/WC Infiltrated Composite Layer on Cast Iron Substrate

2010 ◽  
Vol 97-101 ◽  
pp. 1295-1300
Author(s):  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Xian Ming Sun ◽  
Ying Ma ◽  
Jin Jun Lu ◽  
...  
Keyword(s):  
Cast Iron ◽  
Raw Materials ◽  
Composite Layer ◽  
Fatigue Property ◽  
Micro Structure ◽  
Temperature Property ◽  
Casting Technique ◽  
Surface Composite Layer ◽  
High Temperature Property ◽  
Different Content

The surface composite layer Ni/WC on the cast iron substrate was fabricated through vacuum infiltration casting technique using Ni-based powder and WC particles with different content as raw materials. The micro-structure of infiltrated layer was compact for all infiltrated layer with different WC content, and WC particles distributed uniformly. The surface infiltrated layer was mainly composed of WC particle, intermetallic compound and solid solution. The thermal cycles were beyond 108 times when the infiltrated layer peeled off, which indicated that the specimen with infiltrated layer offered excellent thermal fatigue property. The oxidation rate of substrate was nearly three times as large as that of the infiltrated layer with 20% WC content. The oxidation resistance of the infiltrated layer improved obviously comparing with the substrate because the oxide layer for infiltrated layer was compact.

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.

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.

Effect of Technical Factors on the Quality of Surface Composite Layer

2013 ◽  
Vol 800 ◽  
pp. 321-324
Author(s):  
Li Xiao Jia ◽  
Qi Cui
Keyword(s):  
Coating Layer ◽  
Cast Steel ◽  
Composite Layer ◽  
Test Surface ◽  
High Quality ◽  
Pouring Temperature ◽  
Surface Composite ◽  
Surface Composite Layer ◽  
Technical Factors

The effect of technical factors on the quality of surface composite layer is studied by conventional cast-penetrating process. The result indicates that the high-quality surface composite layer is prone to get when pouring temperature is suitable and the suitable pouring temperature is 1650°C for little cast steel. Appropriate thickness of coating layer is benefit to get surface composite layer with high quality and the quality of sample with 5mm coating layer is better than other samples in test. Surface composite layer with high quality is easy to obtain when coating layer is located in the side of foundry mould.

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