Erosion Wear Property of Surface Diffusion Alloyed Coatings on Magnesium Alloy

2011 ◽  
Vol 682 ◽  
pp. 217-223
Author(s):  
You Ping Ma ◽  
Xiu Lan Li ◽  
Lei Yang ◽  
Xi Peng He
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Surface Diffusion ◽  
Wear Mechanism ◽  
Wear Property ◽  
Erosion Wear ◽  
Erosion Properties ◽  
The Difference ◽  
Wear Tests ◽  
Better Than

Erosion wear tests under different erosion slurry mediums were carried out to investigate erosion properties of the treated samples of ZM5 magnesium alloy by surface diffusion alloying processing (SDAP).The result indicated that the micro-hardness (HV172) near the surface of alloyed specimen was about twice more than that of its substrate(HV82) after treated at 390°C for 8h.The erosion wear resistance β (0.68×104 mm2/g) of the treated specimen was better than that of untreated specimen (0.48×104mm2/g) under the conditions of erosion slurry of oil and quartz. The difference of erosion wear resistance between them was primary due to cutting wear mechanism. While erosion mediums was changed to the slurry of water and quartz, the wear resistance β of the treated specimen increase up to 0.24×104 (mm2/g), and that of the untreated specimen was only 0.09×104 (mm2/g),the difference between them resulted from corrosion wear mechanism predominating, which worsen the erosion wear resistance β.

scholarly journals Enhanced Tribological Properties of LA43M Magnesium Alloy by Ni60 Coating via Ultra-High-Speed Laser Cladding

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 638 ◽  
Author(s):  
Osama Asghar ◽  
Lou Li-Yan ◽  
Muhammad Yasir ◽  
Li Chang-Jiu ◽  
Li Cheng-Xin
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Wear Mechanism ◽  
High Speed ◽  
Surface Engineering ◽  
Energy Dispersive Spectrometer ◽  
Wear Loss ◽  
Cross Sectional ◽  
Ultra High Speed

Laser modification techniques have been widely adopted in the field of surface engineering. Among these modified techniques, ultra-high-speed laser cladding is trending most nowadays to fabricate wear-resistant surfaces. The main purpose of this research is to provide a detailed insight of ultra-high-speed laser cladding of hard Ni60 alloy on LA43M magnesium alloy to enhance its surface mechanical properties. Multiple processing parameters were investigated to obtain the optimal result. The synthesized coating was studied microstructurally by field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The microhardness and wear resistance of the Ni60 coating were analyzed under Vickers hardness and pin on disc tribometer respectively. The obtained results show that the dense Ni60 coating was fabricated with a thickness of 300 μm. No cracks and porosities were detected in cross-sectional morphology. The Ni60 coating was mainly composed of γ-Ni and hard phases (chromium carbides and borides). The average microhardness of coating was recorded as 948 HV0.3, which is approximately eight times higher than that of the substrate. Meanwhile, the Ni60 coating exhibited better wear resistance than the substrate, which was validated upon the wear loss and wear mechanism. The wear loss recorded for the substrate was 6.5 times higher than that of the coating. The main wear mechanism in the Ni60 coating was adhesive while the substrate showed abrasive characteristics.

Solid Particle Erosion of Selected HVOF Sprayed Coatings

2016 ◽  
Vol 827 ◽  
pp. 39-46
Author(s):  
Šárka Houdková ◽  
Zdeněk Česánek ◽  
Pavel Polach
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Thermal Spraying ◽  
Impact Angle ◽  
Erosion Wear ◽  
Wear Properties ◽  
Experimental Development ◽  
The Subject ◽  
The Impact ◽  
Super Alloy

The paper involves the subject and the chosen results of up to now solving of work package “Development of advanced surface treatment of components used in parts of turbines working under the condition of operational temperatures of steam using the HP/HVOF technology of thermal spraying” of the Competence Centre project “Centre of Research and Experimental Development of Reliable Energy Production”. The subject belongs to the field of material engineering and results of solving contribute to fulfilling the main project aim, which is a long time safeguarding of safe, reliable and financially available both classical thermal and nuclear sources of electric power, which consists in extending service life of existing and building new turbo generator blocks. The erosion wear resistance is one of the areas, which were observed. The impact of hard particles on the surface under variable impact angles was simulated in laboratory conditions using an in-house equipment. The wear resistance of selected HVOF sprayed hardmetal and super-alloy coatings was measured and the wear mechanism was evaluated. A strong influence of impact angle on both material volume loss and wear mechanism was monitored. The superior erosion wear properties of super-alloy coatings were proved, regardless the higher hardness of hardmetal coatings.

scholarly journals Microstructure and Properties of AA6061/SiCp Composites Sintered under Ultra High-Pressure

2020 ◽  
Vol 10 (20) ◽  
pp. 7363
Author(s):  
Lei Xu ◽  
Erkuo Yang ◽  
Yasong Wang ◽  
Changyun Li ◽  
Zhiru Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Wear Resistance ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Wear Property ◽  
Ultra High Pressure ◽  
High Pressure Sintering

Ultra high-pressure sintering (UHPS) was used to prepare AA6061/SiCp composites with different contents and the effect of sintering temperatures on microstructure and mechanical properties was investigated in this study. The results showed that a uniform distribution of nano-SiC particles (N-SiCp) is obtained by the UHPS method. With the increase in N-SiCp contents, the higher hardness and better wear resistance could be inspected. The interfacial reactions and Al4C3 phase appeared above 550 °C. The relative density of composites first increased and then decreased; with the temperature raising it reached 99.58% at 600 °C. The hardness and wear property showed the same trend with the hardness reaching 52 HRA and wear rate being 1.0 × 10−6 g/m at 600 °C. Besides, the wear mechanism of the composites is mainly composed of abrasive wear and adhesive wear.

Adhesion Performance and Wear Resistance of Multilayered TiN Coating Deposited by Hollow Cathode Discharge Method

2012 ◽  
Vol 531-532 ◽  
pp. 342-345 ◽  
Author(s):  
Zhi Ming Yu ◽  
Jia Xiu Hu ◽  
Yun Song Niu ◽  
Jie Wei ◽  
Ying Yang
Keyword(s):  
Wear Resistance ◽  
Epitaxial Growth ◽  
Cross Section ◽  
Wear Mechanism ◽  
Hollow Cathode ◽  
Hollow Cathode Discharge ◽  
Tin Coating ◽  
Adhesion Performance ◽  
Discharge Method ◽  
Better Than

Multilayered TiN coating was successfully prepared by hollow cathode discharge method. By introduction of the multilayered microstructure, the columnar epitaxial growth of TiN grains was obviously suppressed. The hardness, adhesion performance and wear resistance of the multilayered TiN coating were compared with those of the ordinary TiN coating. The wear resistance of the multilayered TiN coating is much better than that of the ordinary TiN coating. It is due to the multilayered microstructure of the coating that pileups the dislocations and also inhibits the bulk-flaking behavior for the multilayered TiN coating. The morphology analysis of cross section shows that the wear mechanism of the multilayered TiN coating is the micro-area detachment. Moreover, the adhesion of the TiN coating to the substrate is greatly enhanced by the microstructure optimization of the coating.

The Mechanical Property and Microstructure of Ti-4Al-2V Alloy after High Speed Shot Peening Treatment

2007 ◽  
Vol 353-358 ◽  
pp. 730-734
Author(s):  
Xi Yan Zhang ◽  
Chong Jia ◽  
Xin Chun Zhao ◽  
Zhi Nong Liu ◽  
Jin Yi
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
High Speed ◽  
Wear Behavior ◽  
Influence Factors ◽  
Coarse Grain ◽  
Grain Surface ◽  
Deformation Surface ◽  
Microstructure Characteristic ◽  
Better Than

The microstructure characteristic and wear behavior of the severe deformation surface constitution of Ti-4Al-2V alloy were studied in this paper. The results show that the wear resistance of the deformed surface is much better than that of the coarse grain surface. And the wear mechanism of the nanocrystalline surface is different from that of the coarse grain surface. The former is particle wear mechanism of harder material and the latter is adherence wear mechanism. The influence factors on the wear resistance of the nanocrystalline surface have been discussed.

The Effect of High-Strain Rate on Friction and Wear Behaviors of AZ31 Magnesium Alloy

2014 ◽  
Vol 1081 ◽  
pp. 215-218
Author(s):  
Huan Ju He ◽  
Ling Feng Zhang ◽  
Gen Mei Yang
Keyword(s):  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Wear Mechanism ◽  
High Strain ◽  
Az31 Magnesium Alloy ◽  
Wear Behaviour ◽  
Wear Property ◽  
Hopkinson Pressure Bar ◽  
Pressure Bar

In this study, wear behaviour of AZ31 magnesium alloy shocked by Hopkinson pressure bar was measured, the microstructure morphology was observed and the effect of high strain rate impact on wear resistance and wear mechanism of the alloy were analysed. The results show that: the wear property of AZ31 is improved by the impacted in a reasonable strain rate, but when the strain rate is high enough, it will cause the alloy inactivation. The wear mechanism of the alloy is main grain-abrasion wear, accompanied with the other form of wear, and there will be adhesive wear with the increase of the strain rate.

Electrical Sliding Wear Property of Cu-Ag-Cr Alloy

2006 ◽  
Vol 118 ◽  
pp. 497-502 ◽  
Author(s):  
Ping Liu ◽  
Shu Guo Jia ◽  
Feng Zhang Ren ◽  
Bao Hong Tian ◽  
Mao Sheng Zheng
Keyword(s):  
Abrasive Wear ◽  
Sliding Wear ◽  
Adhesive Wear ◽  
Electrical Current ◽  
Vacuum Induction Furnace ◽  
Wear Property ◽  
Erosion Wear ◽  
Sliding Speed ◽  
Electrical Erosion ◽  
Wear Tests

By means of a vacuum induction furnace, Cu-Ag-Cr alloy were produced. The wear property and mechanism of Cu-Ag-Cr alloy are studied, and its property was compared with a Cu-Ag alloy. The microstructure of the Cu-Ag-Cr alloy before wear tests was analyzed by transmission electron microscopy. Worn surfaces of the Cu-Ag-Cr alloy were analyzed by scanning electron microscope (SEM) and energy dispersive X-ray spectrum (EDS). Wear tests were conducted under laboratory with a special sliding wear apparatus that simulated the tribological conditions of sliding current collectors on contact wires, and alloy wire was slid against a copper-based powder metallurgy strip under unlubricated conditions. The results show that the wear rate of Cu-Ag-Cr alloy increase with the increase in the sliding speed and the sliding distance. Adhesive wear, abrasive wear and electrical erosion wear are the dominant mechanisms under the electrical current sliding processes. At lower sliding speed, adhesives wear and abrasive wear are the major wear damage, while electrical erosion wear and adhesive wear are the major at higher sliding speed. Under the same conditions, the wear resistance of the Cu-Ag-Cr alloy is 2~3 times of the Cu-Ag alloy.

Performance Study of Erosion Wear of Nanostructured WC-12Co Coatings Sprayed by HVOF

2008 ◽  
Vol 373-374 ◽  
pp. 27-30 ◽  
Author(s):  
Z.X. Ding ◽  
Q. Wang ◽  
Zheng Lin Liu
Keyword(s):  
Wear Resistance ◽  
Erosion Resistance ◽  
Failure Mechanisms ◽  
Sem Analysis ◽  
Resistance Testing ◽  
Erosion Wear ◽  
Performance Study ◽  
Slurry Erosion ◽  
Impact Angles ◽  
Wear Tests

In the paper, nanostructured, multimodal and conventional WC-12Co cermet coatings were sprayed by HVOF and the properties and structures of the coatings such as microhardness, microstructure, phase composition were compared. Finally sand solid and slurry erosion wear tests were carried out and their wear failure mechanisms were explored by XRD and SEM analysis. Research results show that microstructures of nanostructured and multimodal WC-12Co coatings prepared by HVOF are dense with little porosity, and their microhardness values are obviously higher than conventional WC-12Co coating. As well, it was found that nanostructured and multimodal WC-12Co coatings exhibited better sand solid and slurry erosion wear resistance in comparison with conventional coating and nanostructured WC-12Co coatings possessed the best sand solid erosion resistance properties at large impact angles and slurry erosion wear resistance. Testing results also show that although decarburization of WC occurred during spraying multimodal and nanostructured WC-12Co powders, the decarburization of WC for the nanostructured powder was more severe.

Study on the Microstructure and Wear Mechanism of Grain-Refined Zinc-Aluminum Alloy

2012 ◽  
Vol 174-177 ◽  
pp. 711-715
Author(s):  
Shu Qing Yan ◽  
Hui Xian Wang
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Mechanism ◽  
Titanium Content ◽  
Wear Property ◽  
Test Results ◽  
Titanium Aluminum Alloys ◽  
Test Conditions ◽  
Titanium Aluminum

Some low-titanium aluminum alloys were prepared and the effect of titanium elements on microstructure and wear property of zinc-aluminum alloy was investigated. The test results showed that addition of titanium is an effective way to refine the grain size of zinc-aluminum alloy. As the titanium content is 0.04 wt%, the grain size becomes to be a minimum value. The wear resistance is also improved with the decrease in the grain size. This can be attributed to the grain boundary strengthening of the test alloys leading to strain hardening. SEM photomicrographs of the worn surfaces shows that the test alloys with and without grain refinement exhibit similar wear mechanism. However, the grain-refined sample of the alloy exhibited a more stable friction coefficient than that of the untreated ones under the same test conditions.

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