MICROSTRUCTURE AND DRY SLIDING WEAR RESISTANCE OF LASER CLADDING Ti-Al-Si COMPOSITE COATING

2017 ◽  
Vol 24 (Supp01) ◽  
pp. 1850009 ◽  
Author(s):  
H. X. ZHANG ◽  
H. J. YU ◽  
C. Z. CHEN ◽  
J. J. DAI
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Test Machine ◽  
Transmission Microscopy ◽  
Hardness Tester ◽  
Three Samples

In order to improve the wear resistance of Ti alloys, different mass ratios of Ti-Si-Al powders were designed to fabricate hard phases reinforced intermetallic matrix composite coatings on the Ti-6Al-4V substrate by laser cladding. The corresponding coatings were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and high resolution transmission microscopy (HRTEM). The HV-1000 hardness tester and MM200 wear test machine were employed to test the hardness and the wear resistance of the composite coatings, respectively. The composite coatings mainly consisted of the reinforcements of Ti5Si3, Ti3AlC2 and Ti7Al5Si[Formula: see text] and the matrix of Ti3Al, TiAl, TiAl3 and [Formula: see text]-Ti. The micro-hardness of the Ti-35Al-15Si coating was from 956 HV[Formula: see text] to 1130 HV[Formula: see text], which was approximately 3–4 times of the substrate and the highest in the three samples. The wear rate of the Ti-35Al-15Si coating was 0.023[Formula: see text]cm3[Formula: see text][Formula: see text][Formula: see text]min[Formula: see text], which was about 1/4 of the Ti-6Al-4V substrate. It was the lowest in the three samples.

Microstructure and wear resistance of composite coating by laser cladding Ni60A/B4C pre-placed powders on Ti-6Al-4V substrate

2017 ◽  
Vol 24 (4) ◽  
pp. 541-546 ◽  
Author(s):  
Hongxia Zhang ◽  
Huijun Yu ◽  
Chuanzhong Chen
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Test Machine ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
The Matrix ◽  
Metallurgical Bond

AbstractThe composite coatings were fabricated by laser cladding Ni60A/B4C pre-placed powders on the surface of Ti-6Al-4V alloy for improving wear resistance and hardness of the substrate. In this research, the composite coatings were studied by means of X-ray diffraction, scanning electron microscope and energy dispersive spectrometer. The sliding wear tests were performed using MM200 wear test machine. The hardness of the coatings was tested by HV-1000 hardness tester. After laser cladding, it was found that there was a good metallurgical bond between the laser cladding coating and Ti-6Al-4V substrate. The composite coatings were mainly composed of the matrix of γ-Ni and a little Ni3Ti and the reinforcements of TiB2, TiC and CrB. The hardness of the sample of Ni60A-5B4C was approximately 2.5–3.5 times that of the Ti-6Al-4V substrate. The hardness of the sample of Ni60A-10B4C was 30% higher than that of sample 1. The wear resistance of samples 1 and 2 were 11 times and 10 times that of the substrate, respectively.

MICROSTRUCTURE AND WEAR RESISTANCE OF COMPOSITE COATING BY LASER CLADDING Al/TiN ON THE Ti–6Al–4V SUBSTRATE

2015 ◽  
Vol 22 (03) ◽  
pp. 1550044 ◽  
Author(s):  
H. X. ZHANG ◽  
H. J. YU ◽  
C. Z. CHEN
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Test Machine ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
The Matrix ◽  
Metallurgical Bond

The composite coatings were fabricated by laser cladding Al / TiN pre-placed powders on Ti –6 Al –4 V substrate for enhancing wear resistance and hardness of the substrate. The composite coatings were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The sliding wear tests were performed by MM200 wear test machine. The hardness of the coatings was tested by HV-1000 hardness tester. After laser cladding, it was found that there was a good metallurgical bond between the coating and the substrate. The composite coatings were mainly composed of the matrix of β- Ti  ( Al ) and the reinforcements of titanium nitride ( TiN ), Ti 3 Al , TiAl and Al 3 Ti . The hardness and wear resistance of the coatings on four samples were greatly improved, among which sample 4 exhibited the highest hardness and best wear resistance. The hardness of the coating on sample 4 was approximately 2.5 times of the Ti –6 Al –4 V substrate. And the wear resistance of sample 4 was four times of the substrate.

EFFECT OF Y2O3 ON MICROSTRUCTURES AND WEAR RESISTANCE OF TiC REINFORCED Ti-Al-Si COATING BY LASER CLADDING ON TC4 ALLOY

2019 ◽  
Vol 26 (10) ◽  
pp. 1950077 ◽  
Author(s):  
H. X. ZHANG ◽  
J. J. DAI ◽  
Z. W. MA ◽  
X. Y. WANG ◽  
N. L. ZHANG
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Test Machine ◽  
Hardness Tester ◽  
Reinforced Composite ◽  
Metallurgical Bonding ◽  
Tc4 Alloy

In this paper, TiC reinforced composite coatings were fabricated on TC4 alloy by laser cladding Ti,Al,Si, TiC and Y2O3 mixed powders. Microstructures and properties of the clad coatings with and without Y2O3 were discussed by comparative experiments. SEM, XRD and EDS were employed to discover the microstructures and the composition of phases. The hardness and wear resistance of the coatings were tested by the MM200 wear test machine and a HV-1000 digital hardness tester, respectively. The results showed that the coating was majorly composed of Ti5Si3, Ti7Al5[Formula: see text], Ti3AlC2, Ti3Al, Al3Ti, TiAl and Y2O3. The dilution zone exhibited a metallurgical bonding without pores and cracks. Compared with the TC4 substrate, the hardness and wear resistance of the coatings were heightened by 5–6 and 4.5–5.8 times, respectively. With 2.0[Formula: see text]wt.% Y2O3 addition, the microstructure of the coating was refined significantly, and the microhardness and dry sliding wear resistance were enhanced further. The effects of Y2O3 were attributed to heterogeneous nucleation of the residual Y2O3.

scholarly journals Effect of CeO2 on crack sensitivity and tribological properties of Ni60A coatings prepared by laser cladding

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110131
Author(s):  
Gong Yuling ◽  
Wu Meiping ◽  
Miao Xiaojin ◽  
Cui Chen
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Hardness Test ◽  
High Wear Resistance ◽  
Fine Crystal ◽  
Tc4 Titanium Alloy

All the time, the wear resistance of TC4 titanium alloy restricts its application in friction parts. In order to solve this problem, in this work, CeO2/Ni60A composite coatings (0, 1, 2, 3, 4 wt.% CeO2) were prepared on TC4 titanium alloy by laser cladding technology. The detection and characterization of the coatings were mainly carried out by X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy-dispersive spectrometer, Vickers hardness test, and wear test. The results showed that appropriate proportion of CeO2 powder could effectively reduce the crack sensitivity of Ni60A coating on TC4 substrate. While the amount of CeO2 powder was 3wt.%, there were no obvious cracks, pores, and other defects in the coating. Coatings mainly consisted of Ti2Ni, TiC, TiB2, Ce2O3, and the substrate α–Ti. CeO2 has negligible influence on the composition of the phase, but it significantly increased the absorption rate of the powder to light, promoted the fluidity of the molten pool. Among five coatings, the average hardness of the 3Ce coating was the highest and the highest hardness value could reach 1163.7 HV0.3, which was 3.58 times higher than TC4 substrate, the friction coefficient was 0.307, and the wear rate was 1.11 × 10−5 mm3/N m, which reflected extremely high wear resistance performance. Adding an appropriate amount of CeO2 improved the microstructure of the coating, and realized the fine crystal strengthening of the coating.

Microstructure and Wear Resistance of the Composite Coatings Fabricated on Titanium Alloys by Laser Cladding

2010 ◽  
Vol 139-141 ◽  
pp. 398-401
Author(s):  
You Feng Zhang ◽  
Jun Li
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Dry Sliding Wear ◽  
Matrix Composites ◽  
Hardness Tester ◽  
Scan Speed

In situ reaction synthesized TiB reinforced titanium matrix composites were fabricated using rapid non-equilibrium synthesis techniques of laser cladding. TiB/Ti composite coating was treated on Ti-6Al-4V surface using Ti and B powder mixture by laser cladding. Microstructure and dry sliding wear behavior of the in situ synthesized TiB/Ti composite coatings were investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), energy-dispersive spectroscopy (EDS), hardness tester and friction and wear tester. The composite coatings consist of Ti, TiB and intermetallic compounds. The TiB reinforcement dispersed homogeneously in the composite coatings. The wear tests show that the friction coefficient and wear weight loss ratio of the coatings is lower than that of the Ti-6Al-4V alloy. The composite coating was reinforced by the in situ synthesized TiB ceramic particles. Based on the SEM observation, effects of scan speed on hardness and wear resistance of the laser cladding coatings were investigated and discussed.

scholarly journals Wear Behaviors of TiN/WS2 + hBN/NiCrBSi Self-Lubricating Composite Coatings on TC4 Alloy by Laser Cladding

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 747
Author(s):  
Kaiwei Liu ◽  
Hua Yan ◽  
Peilei Zhang ◽  
Jian Zhao ◽  
Zhishui Yu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Composite Coating ◽  
Laser Cladding ◽  
Sliding Wear ◽  
Composite Coatings ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
X Ray ◽  
Tc4 Alloy

TiN and WS2 + hBN reinforced Ni-based alloy self-lubricating composite coatings were fabricated on TC4 alloy by laser cladding using TiN, NiCrBSi, WS2, and hBN powder mixtures. Energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and optical microscopy (OM) were adopted to investigate the microstructure. The wear behaviors of the self-lubricating composite coatings were evaluated under large contact load in room temperature, dry-sliding wear-test conditions. Results indicated that the phases of the coatings mainly include γ-Ni, TiN, TiNi, TiW, WS2, and TiS mixtures. The average microhardness of the composite coating is 2.3–2.7 times that of the TC4 matrix. Laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coatings revealed a higher wear resistance and lower friction coefficient than those of the TC4 alloy substrate. The friction coefficient (COF) of the coatings was oscillating around approximately 0.3458 due to the addition of self-lubricant WS2 + hBN and hard reinforcement TiN. The wear behaviors testing showed that the wear resistance of the as-received TC4 was significantly improved by a laser cladding TiN/WS2 + hBN/NiCrBSi self-lubricating composite coating.

Laser Cladding of Zr55Al10Ni5Cu30/SiC Amorphous Composite Coatings on AZ91D Magnesium Alloy for Improvement of Wear Resistance

2010 ◽  
Vol 160-162 ◽  
pp. 450-455
Author(s):  
Kai Jin Huang ◽  
Chao Dong Tan ◽  
Chang Rong Zhou
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Wear Property ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
Az91d Magnesium Alloy

To improve the wear property of magnesium alloys, Zr-based amorphous composite coatings have been fabricated on AZ91D magnesium alloy by laser cladding using mixed powders Zr55Al10Ni5Cu30/SiC. The microstructure of the coating was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The wear resistance of the coatings was evaluated under dry sliding wear test condition at room temperature. The results show that the coatings mainly consist of amorphous and different crystalline phases. The coatings exhibit excellent wear resistance due to the recombination action of amorphous and different crystalline phases. The main wear mechanism of the coatings and the AZ91D sample are different, the former is abrasive wear and the latter is adhesive wear.

Laser Cladding of Ni60/WC/TiN Composite Coatings on 00Cr13Ni4Mo Hydro Turbine Blade Stainless Steel for Improvement of Wear Resistance

2012 ◽  
Vol 430-432 ◽  
pp. 101-105
Author(s):  
Kai Jin Huang ◽  
Hua Rui Jiang ◽  
Xin Lin
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Turbine Blade ◽  
Laser Cladding ◽  
Composite Coatings ◽  
High Hardness ◽  
Dry Sliding Wear ◽  
Wear Property ◽  
Hydro Turbine ◽  
Wear Condition

To improve the wear property of 00Cr13Ni4Mo hydro turbine blade stainless steel, Ni-based composite coatings were fabricated on 00Cr13Ni4Mo stainless steel by laser cladding using mixed powders of Ni60, WC and TiN. The microstructure of the coatings was characterized by XRD and SEM techniques. The wear resistance of the coatings was evaluated under dry sliding wear condition at room temperature. The results show that the coatings mainly consist of Ni-based solid solution, WC and TiN phases. The coatings exhibit excellent wear resistance due to its high hardness of WC and TiN phases. The main wear mechanisms of the coatings and the 00Cr13Ni4Mo sample are different, the former is abrasive wear and the latter is adhesive wear.

scholarly journals Effect of Carbon Fiber Addition on the Microstructure and Wear Resistance of Laser Cladding Composite Coatings

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 684 ◽  
Author(s):  
Jianfeng Li ◽  
Zhencai Zhu ◽  
Yuxing Peng ◽  
Gang Shen
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Carbon Fibers ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Alloy Coating ◽  
X Ray ◽  
Nano Size ◽  
Original Coating

In this study, the effect of carbon fibers (CFs) on the microstructure and wear resistance of Fe-based alloy coating produced by laser cladding was investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS), and wear tester. The results indicated that with the addition of CFs, the microstructure of the composite coating mainly transformed from α-Fe cellular dendrites and γ-Fe/(Cr, Fe)7C3/CrB eutectics to bulk-like (Cr, Fe)7C3, nano-size B4C, and γ-(Fe, Ni)/(Cr, Fe)23C6 lamellar eutectics. Additionally, the microhardness and wear resistance of the composite coating compared with the original coating both increased by approximately two times. The original coating showed the dominant wear mechanisms of micro-cutting and serious brittle spalling, while the composite coating with CFs showed the main wear mechanism of slight scratching.

Microstructure and Wear Resistance of Laser Cladding Nano-Al2O3/MCrAlY Composite Graded Coating on TiAl Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1350-1353 ◽  
Author(s):  
Dong Sheng Wang ◽  
Zong Jun Tian ◽  
Song Lin Wang ◽  
Li Da Shen
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Wear Mechanism ◽  
Tial Alloy ◽  
Dry Sliding Wear ◽  
Hardness Tester ◽  
Mcraly Coating ◽  
Laser Cladding Process ◽  
Graded Coating ◽  
Equiaxed Grains

In this paper, the pure MCrAlY coating and nano-Al2O3 particles reinforced MCrAlY graded coating were prepared on TiAl base intermetallic alloy substrates by laser cladding process. Furthermore, the microstructure characterization, microhardness and wear resistance of the two kinds of MCrAlY coating were comparatively investigated with scanning electron microscope (SEM), HXD-1000TC hardness tester and MM-200 block-on-ring dry sliding wear tester. The results show that the laser-clad pure MCrAlY coating has a dendrite crystals characteristic. However, the graded composite MCrAlY coating consists of fine equiaxed grains because of addition of nanometer ceramic particles. Moreover, the grain size becomes small with increasing the nano-Al2O3 content in the coating. The microhardness and wear resistance of the composite coating is higher than that of the pure coating. The mainly wear mechanism of the pure MCrAlY coating is abrasive and delamination, while the mainly wear mechanism of the composites graded MCrAlY coating is abrasive.

Sign in / Sign up

Export Citation Format

Share Document