Laser Surface Coating of Metal Matrix Composite on Ti6Al4V Alloy

2003 ◽  
Author(s):  
W. Pang ◽  
H. C. Man ◽  
T. M. Yue
Keyword(s):  
Wear Resistance ◽  
Surface Coating ◽  
Sliding Wear ◽  
Dilution Effect ◽  
Laser Surface ◽  
Ti6al4v Alloy ◽  
Constant Thickness ◽  
Weight Percentage ◽  
Incident Laser Power ◽  
Dilution Level

Laser surface coating of Mo, WC and Mo-WC powders on the surface of Ti6Al4V alloys using a 2kW Nd-YAG laser was performed. The dilution effect, microstructure, microhardness and wear resistance of the fabricated MMC coating were investigated. With a constant thickness of pre-placed powder, the dilution levels of the alloyed layers were found to be increased with the incident laser power. The fabricated MMC layer was metallurgically bonded to the Ti6Al4V substrate. The microhardness of the fabricated surface layer was found to be inversely proportional to the dilution level. The EDAX and XRD spectra results show that new intermetallic compounds and alloy phases were formed in the laser fabricated layer. With increasing weight percentage content of WC particles in the Mo-WC pre-pasted powder, the microhardness and sliding wear resistance of the laser surface coating were increased by 87% and 150 times respectively as compared with the Ti6Al4V alloy.

Characterization of dry sliding wear resistance of laser surface hardened En 8 steel

2005 ◽  
Vol 167 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Rakesh Kaul ◽  
P. Ganesh ◽  
Pragya Tiwari ◽  
R.V. Nandedkar ◽  
A.K. Nath
Keyword(s):  
Wear Resistance ◽  
Sliding Wear ◽  
Laser Surface ◽  
Dry Sliding Wear ◽  
Dry Sliding

Wear Behavior of Laser-Hardened GCr15 Steel under Lubricated Sliding Conditions

2009 ◽  
Vol 628-629 ◽  
pp. 697-702 ◽  
Author(s):  
Sheng Lei ◽  
Quan Kun Liu ◽  
Yu Ping Liu ◽  
Heng Li
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Wear Rate ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Laser Surface ◽  
Ferrous Alloys ◽  
Gcr15 Steel ◽  
Lubricated Sliding

Microstructure, microhardness and tribological properties of laser hardened GCr15 steel were investigated in this paper. The wear resistance under lubricated sliding conditions was compared between specimens treated with laser and those of conventionally hardened. The tribological properties of laser surface-quenched GCr15 steel specimens were slightly better due to the effects of the microstructure hardening, high hardness and toughness, with the wear rate (in the order of 10-6mg/Nm) lower than that of the conventionally treated specimens. At the steady state, the frictional coefficient of laser-treated samples had no obvious difference from that of the conventionally treated samples. The wear mechanism for both cases was similar, generally involved surface fatigue wear and slight abrasion wear. LeiQ.K. Liu S. Lei Introduction H. Li In recent years, among the various surface modification methods, laser-induced surface modification has gained much attention for achieving the desired properties for applications[1]. This method is mainly used for ferrous alloys which undergo martensitic transformation and thus form a very hard surface layer with negligible surface roughness and distortion[2]. Some ideas demonstrated that the wear rate at a particular contact pressure can be strongly influenced by the microstructure of the steel, but there is also contrary idea that under the conditions of mild wear, the microstructural constituents of steels have no significant influence on the wear rate, although they affect the rate of severe wear. Previous studies of the authors demonstrated that under the dry sliding wear conditions, laser surface-hardened specimens of ferrous alloys exhibited enhanced wear resistance than conventionally hardened specimens. The aim of the study is to investigate the lubricated sliding wear behaviors of laser surface hardened GCr15 steel specimens and to compare the effect of the different microstructure compositions for laser transformation hardening with those of conventionally hardened and quenched. Moreover, the wear properties of the GCr15 steel and its corresponding wear mechanism under the lubricated wear conditions will also be studied.

Laser Cladding of Titanium Alloys with Ti+Al+C Powders

2012 ◽  
Vol 510 ◽  
pp. 738-741
Author(s):  
Jian Hong Wang ◽  
Pei Kang Bai ◽  
Zhen Lin Zhang ◽  
Yu Xin Li
Keyword(s):  
Wear Resistance ◽  
Titanium Alloys ◽  
Laser Cladding ◽  
Atomic Ratio ◽  
Laser Surface ◽  
Ti6al4v Alloy ◽  
Aluminum Powders ◽  
Al Content ◽  
Metallurgical Bonding

Laser surface cladding of Ti6Al4V alloy by Ti+Al+C powders (Titanium and carbon powders with an atomic ratio of 1:1 were mixed with 20-60wt.% aluminum powders) was investigated using CO2 laser. TiC particles were in situ formed mainly during the solidification and sizes of TiC particles were varied according to different contents of aluminum powders in the Ti+Al+C system. The results show that the coating had good metallurgical bonding with substrate when Al content was 20% or 40%. The microhardness of coating is 738HV0.5 which was 2 times as that of the Ti6Al4V alloy approximately. The wear resistance of TiC/Al ceramic layer was approximately 3 times greater than that of the Ti6Al4V substrate. 1

Improving the wear resistance of hoe blades by modifying of restoration coatings

2019 ◽  
Vol 24 (94/4) ◽  
pp. 27-32
Author(s):  
T.S. Skoblo ◽  
I.N. Rybalko ◽  
A.V. Tihonov ◽  
T.V. Maltsev
Keyword(s):  
Wear Resistance ◽  
Transition Layer ◽  
Surface Coating ◽  
Dry Friction ◽  
Raw Materials ◽  
Bentonite Clay ◽  
Magnetic Fraction ◽  
Cutting Surface ◽  
Agricultural Machines ◽  
Modifying Additive

The possibility of using a non-magnetic fraction of a detonation charge with a diamond fraction from the disposal of ammunition to modify the restoration coatings of a natural product – clay and secondary raw materials — was studied. Four different coating variants were investigated. For this, a T-620 electrode was used with its additional modification by coating with bentonite clay, as well as with a non-magnetic fraction of the detonation charge and applying it in the form of a slip coating on the cutting surface of the cultivator. It is shown that the use of such additives allows to increase the resistance of the working tool of agricultural machines, reduces its tendency to damage due to the minimum penetration of the thin-walled product of the hoe blade and a decrease in the cross section of the transition layer and the level of stress. Each modifier makes changes to increase the microhardness to varying degrees. An increase in microhardness is observed on the surface of the coating and its gradual decrease to the transition layer. The surface coating with the additional introduction of bentonite clay in a liquid bath has the highest microhardness. Its microhardness varies from HV-50-1009.7 to HV-50-615.2. Similarly, the effect of the modifying additive of the detonation charge, the microhardness varies from HV-50-969.6 to HV-50-633.26. When clay or a mixture is introduced into the restoration coating, the wear resistance increases by 1.3 - 2 times with respect to the deposited surfacing only by the electrode and by 2 - 3 times to the initial material of the cultivator. It was found that the lowest coefficient is characteristic for dry friction, as well as for hydroabrasive, for samples with additional modification with clay or a detonation charge

scholarly journals A superior strength and sliding-wear resistance combination of ductile iron with nanobainitic matrix

2021 ◽  
Vol 11 ◽  
pp. 1175-1183
Author(s):  
Yuzhou Du ◽  
Xiaolong Wang ◽  
Dongya Zhang ◽  
Xin Wang ◽  
Chunpeng Ju ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Ductile Iron ◽  
Sliding Wear

Tribological effects of laser surface texturing and residual stress

2018 ◽  
Vol 70 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Shuwen Wang ◽  
Feiyan Yan ◽  
Ao Chen
Keyword(s):  
Residual Stress ◽  
Wear Resistance ◽  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface ◽  
Friction Reduction ◽  
Laser Surface Texturing ◽  
Wear Testing ◽  
Content Type ◽  
Surface Textures

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

Tribological Properties of Ti-Al Alloy Self-Lubricating Composite Materials

2013 ◽  
Vol 842 ◽  
pp. 114-117
Author(s):  
Xiu Ling Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Yi Zhang
Keyword(s):  
Sliding Wear ◽  
Solid Lubricant ◽  
Al Alloy ◽  
Test Results ◽  
Weight Percentage ◽  
Dry Conditions ◽  
Hot Pressing Sintering ◽  
Worn Surface ◽  
Wear Tests ◽  
Self Lubricating Composites

A series of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 (CB) self-lubricating composites with addition of different weight percentage of solid lubricant were prepared by vacuum hot pressing sintering. Sliding wear tests against 45#steel were performed on the specimen in dry conditions, worn morphology was observed by the scanning electron microscope (SEM). The test results show that when addition of solid lubricant weight percentage is 10%, the worn surface of the composites is most smooth.The main wear mechanisms of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 composite are abrasive wear and adherent wear.

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