THE EFFECT OF RARE EARTH ON THE STRUCTURE AND PERFORMANCE OF LASER CLAD COATINGS

2006 ◽  
Vol 13 (04) ◽  
pp. 509-517 ◽  
Author(s):  
RUILIANG BAO ◽  
HUIJUN YU ◽  
CHUANZHONG CHEN ◽  
QING DONG
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Rare Earth ◽  
Laser Cladding ◽  
Phase Structure ◽  
Wear Resistant Coating ◽  
Preliminary Discussion ◽  
Effect Mechanism ◽  
And Performance ◽  
Development Tendency

Laser cladding is one kind of advanced surface modification technology and has the abroad prospect in making the wear-resistant coating on metal substrates. However, the application of laser cladding technology does not achieve the people's expectation in the practical production because of many defects such as cracks, pores and so on. The addiction of rare earth can effectively reduce the number of cracks in the clad coating and enhance the coating wear-resistance. In the paper, the effects of rare earth on metallurgical quality, microstructure, phase structure and wear-resistance are analyzed in turns. The preliminary discussion is also carried out on the effect mechanism of rare earth. At last, the development tendency of rare earth in the laser cladding has been briefly elaborated.

Advancement in Ferrite-Based Alloy Coatings by Laser Cladding

2013 ◽  
Vol 591 ◽  
pp. 253-257 ◽  
Author(s):  
Hui Jun Yu ◽  
Ting He ◽  
Chuan Zhong Chen
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Laser Cladding ◽  
High Performance ◽  
Surface Region ◽  
Price Ratio ◽  
Alloy Component ◽  
Near Surface ◽  
Development Tendency ◽  
Corrosion And Oxidation

Fe-based alloy is widely used for its good wear resistance and high performance-to-price ratio compared with other alloys. Laser cladding is a kind of valid method of metal surface modification, which has been successfully employed to modify the microstructure and/or composition of the near surface region to improve the wear, corrosion and oxidation resistance of a ferrite-based alloy component. In this paper, the recent research status in laser clad ferrite-based alloys is reviewed. The rules of designing laser cladding materials are introduced. The main problems and the solutions of the laser cladding materials application are analysized. The development tendency of laser cladding is forecast.

scholarly journals Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Zhenglei Yu ◽  
Lunxiang Li ◽  
Deqiang Zhang ◽  
Guangfeng Shi ◽  
Guang Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Rare Earth ◽  
Fracture Mechanics ◽  
Composite Coating ◽  
Laser Cladding ◽  
Rare Earth Oxide ◽  
Cracking Mechanism ◽  
Crack Susceptibility ◽  
The Rare Earth

AbstractNickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding, but the crack sensitivity would be increase due to the higher strength and hardness, which reduced the wear resistance of Ni-based alloys. In this paper, Ni-based coatings with the addition of a plastic phase (an austenitic stainless net) were prepared using laser cladding technology, and the CeO2 was added in cladding layers. The cracking mechanism, microhardness, microstructure, phase composition, and wear properties were investigated. The relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechanics and thermal elastic fracture mechanics. The fracture criterion of the nickel-based coating was obtained, and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficient Δα. Thus, a new method was proposed, which the stainless steel nets were prefabricated on the substrate. It was found that the number of cracks reduced significantly with the addition of stainless steel net. When the stainless steel net with 14 mesh was added in Ni-based coatings, the average microhardness of nickel composite coating was 565 HV0.2, which was 2.6 times higher than that of the 45 steel substrate. Although the rare earth oxide 4 wt.% CeO2 and stainless steel net were added in the Ni-based coating reducing the microhardness (the average microhardness is 425 HV0.2), the wear resistance of it improved substantially. The wear volume of Ni-based composite coating was 0.56×10−5 mm3·N−1·m−1, which was 85.1% lower than that of 45 steel. The experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.% CeO2. This research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated by laser cladding.

scholarly journals Effects of TiC and rare earth on the microstructure and performance of LASER cladding Mo2FeB2

2021 ◽  
pp. 113-118
Author(s):  
Z.X. Zhang ◽  
H.F. Tian ◽  
F.L. Tantai ◽  
H. Liu ◽  
W. Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Laser Cladding ◽  
And Performance ◽  
Microstructure And Performance

LaF3 Influences on Wear Resistance of TiC/Ni Cladding Layer by Laser Cladding In Situ Fabricated

2012 ◽  
Vol 549 ◽  
pp. 335-339 ◽  
Author(s):  
Cheng Qiang Wang ◽  
Li Juan Wang ◽  
Jiang Qiao Wu ◽  
Zi Zhen Chen ◽  
Yong Jun Niu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Laser Cladding ◽  
Friction And Wear ◽  
In Situ Synthesis ◽  
Particle Segregation ◽  
Cladding Layer ◽  
Tic Particle ◽  
Heterogeneous Phase

The TiC/Ni composite coating was prepared by Laser Cladding In-situ Synthesis on the surface of damper plate with Ni--Ti-Mo-C -LaF3 powder．Microstructure and Wear resistance have been studied throughout EPMA、SEM and M—2000 Friction and Wear Tester．It was found that the microstructure got more homogenized grain fineness became finer, TiC distributed better and heterogeneous phase decreased, as adding moderate rare earth LaF3. When the content of LaF3 was 1%, the highest microhardness was got. While the optimal wear resistance properties were obtained with 2% LaF3. The laser cladding with excessive LaF3 has more TiC particle segregation which induces hardness and wear resistance of cladding layer.

Surface Modification of Aluminum and Its Alloys Using Conversion Coatings

2019 ◽  
Author(s):  
L. Anicai ◽  
Teodor Visan
Keyword(s):  
Thin Films ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Rare Earth ◽  
Environmentally Friendly ◽  
Chemical Conversion ◽  
Rare Earth Compounds ◽  
Conversion Coatings ◽  
Transitional Metals ◽  
And Performance

This article presents some information related to the chemical conversion procedures applied onto Al and its alloys involving both classical hexavalent chromium-based solutions and the most recent ones involving transitional metals and/or rare earth compounds, as environmentally friendly alternatives. The main characteristics of the formed thin films, including appearance, composition, morphology, corrosion resistance, and performance, are also presented.

Increasing Fatigue Strength and Wear Resistance of Additive Manufactured Nickel Alloy (UNS N07718) by Ultrasonic Nanocrystal Surface Modification (UNSM) Treatment

2020 ◽  
Author(s):  
Young Sik Pyun ◽  
Seimi Choi ◽  
Ruslan Karimbaev ◽  
Jun Suek Ro ◽  
Choong Ho Sanseong ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Fatigue Strength ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Wide Range ◽  
Direct Energy ◽  
Metal 3D Printing ◽  
And Performance

Abstract Additive Manufacturing (AM) which is also known as metal 3D printing technique is a promising process with a massive potential for developing a component for wide range applications for various industries. Recently, AM process was introduced to the nuclear power plant industry as AM is capable of manufacturing the substitution of aging and obsolete component. However, the AM component has inferior mechanical properties and performance in terms of fatigue strength and wear resistance compared to its conventionally manufactured counterpart. Ultrasonic Nanocrystal Surface Modification (UNSM) is one of mechanical surface modification treatment known for improving fatigue strength and wear resistance of wrought material. Hence, in this study effect of UNSM treatment on fatigue strength and wear resistance of additive manufactured material was investigated. The investigation was done to Ni-based alloy 718 (UNS N07718) as this material is used for nuclear power plant components and was manufactured with two different AM techniques namely Powder Bed Fusion (PBF) and Direct Energy Deposition (DED) processes. The evaluation was conducted by comparing the as-polished and UNSM-treated specimens for each AM processes by performing fatigue and tribo tests. This result will become a part of the technical basis for KEPIC Code Case development.

Progress of Laser Cladding Wear Resistant Coating on Titanium Alloy Surface: A Review

2021 ◽  
Vol 1035 ◽  
pp. 521-527
Author(s):  
Wen Wen Song ◽  
Chun Feng ◽  
Li Juan Zhu ◽  
Fang Fang Zhang
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Laser Cladding ◽  
Alloy Powder ◽  
Great Influence ◽  
Surface Hardness ◽  
Wear Resistant Coating ◽  
Powder Materials ◽  
Wear Resistant ◽  
Resistant Coating

Laser cladding is an effective way to improve the surface hardness and wear resistance of titanium alloy. The powder materials and laser cladding process parameters have great influence on the properties of the wear resistant coating. In order to reduce the common defects including the cracks and pores of the coating, titanium alloy powder and self-melting alloy powder are selected to ensure the good adhesion between titanium alloy and wear resistant coating. In addition, the strengthening phase and self-lubricating phase were added to the laser cladding powder material to improve the micro hardness and reduce the friction coefficient, which bring in the improvement of the wear resistance of the coating. In the present work, the selection principle and application effect of powder materials for wear-resistant coatings are reviewed. the research status of the influence of laser technological parameters on coating properties is discussed. Meanwhile, the methods to reduce the defect of wear resistance coating by laser cladding are proposed.

scholarly journals Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

2021 ◽  
Author(s):  
Zhenglei Yu ◽  
Lunxiang Li ◽  
Deqiang Zhang ◽  
Guangfeng Shi ◽  
Guang Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Rare Earth ◽  
Fracture Mechanics ◽  
Composite Coating ◽  
Laser Cladding ◽  
Rare Earth Oxide ◽  
Abrasive Resistance ◽  
Cracking Mechanism ◽  
The Rare Earth

Abstract Ni-based coatings with the addition of a plastic phase- an austenitic stainless net were prepared using laser cladding technology, and the CeO2 was added in cladding layers. The cracking mechanism, microhardness, microstructure, phase composition, and wear properties were investigated. The relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechanics and thermal elastic fracture mechanics. The Fracture criterion of the nickel-based coating was obtained, and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficient Δα. Then a new method was proposed, in which the substrate was prefabricated the stainless steel net. It was found that the number of cracks reduced significantly with the addition of stainless steel net. When the stainless steel net with 14 mesh was added in Ni-based coatings, the average microhardness of nickel composite coating was 565 HV0.2, which was 2.6 times higher than that of the 45 steel substrate. Although the rare earth oxide 4 wt.% CeO2 and stainless steel net were added in the Ni-based coating reducing the microhardness (the average microhardness is 425 HV0.2), the wear resistance of it improved substantially. The wear volume of Ni-Based composite coating was 0.56×10-5mm3·N-1·m-1, which was 85.1% lower than that of 45 steel and 61.9% lower than that of Ni-based coating without CeO2 and stainless steel net. The experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.% CeO2.

WC Particles Reinforced Co-Based Alloy Coatings Produced by Laser Cladding

2016 ◽  
Vol 849 ◽  
pp. 695-701 ◽  
Author(s):  
Jia Zi Zhang ◽  
Guang Yuan Wang ◽  
Yuan Qin ◽  
Sen Yang
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Service Life ◽  
Laser Cladding ◽  
Microstructure Evolution ◽  
Composite Coatings ◽  
Alloy Composite ◽  
Die Steel ◽  
Cladding Layer ◽  
And Performance

To extend the service life of hot die steel (H13), WC particles reinforced Co-based alloy composite coatings were produced by laser cladding. The microstructure evolution and performance of the cladding layer were investigated. The experiment results showed that there existed fine dendritic crystals and dispersive WC particles in the cladding layer. The coatings were mainly composed of γ-Co, WC and Co3W3C phases. The microhardness of the cladding layer was higher than that of the arc surfacing layer, and the microhardness gradually increased with WC content. Compared to the substrate, the friction coefficient of the cladding layer reduced greatly. The coatings with 15wt.% WC possess the best wear resistance.

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