Microstructure and properties of laser clad Fe-based amorphous alloy coatings containing Nb powder

Wang, Haozheng; Cheng, Yanhai; Yang, Jing-yong; Wang, Qingqing

doi:10.1016/j.jnoncrysol.2020.120351

Cited by 33 publications

(14 citation statements)

References 39 publications

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“…In addition, Figure 3 exhibits a lot of white area on the surface (white circle), and EDS analysis indicates that the Nb phase is precipitated in this area, which is consistent with the XRD pattern [23]. In addition, Figure 3 exhibits a lot of white area on the surface (white circle), a analysis indicates that the Nb phase is precipitated in this area, which is consiste the XRD pattern [23].…”

Section: Phases Analysissupporting

confidence: 70%

“…This is attributed to the segregation o La2O3 at the grain boundaries, weakening the refining effect and increasing the grain size [26,27]. In addition, Figure 3 exhibits a lot of white area on the surface (white circle), and EDS analysis indicates that the Nb phase is precipitated in this area, which is consistent with the XRD pattern [23].…”

Section: Microstructuresupporting

confidence: 67%

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Effect of La2O3 on Microstructure and Properties of Laser Cladding SMA Coating on AISI 304 Stainless Steel

Liu

Qiao

2022

Coatings

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Known as having a stress self-accommodation characteristic, the laser cladding shape memory alloy (SMA) coatings have been widely used in material failure repair. Nevertheless, their further development is greatly limited by their low microhardness (250 HV0.2) and corrosion resistance. Benefiting from the capability of refined grain and adjusted microstructure, rare earth oxides play a key role in improving the properties of materials. Herein, to improve the microhardness and anti-corrosion of laser cladding SMA coatings, different amounts of La2O3 were doped in SMA coating. The influence of the different La2O3 doping amounts on the phases, grain size and microhardness was studied. The anti-corrosion of the SMA/La2O3 composite coating was explored in 3.5 wt.% sodium chloride solution. Results showed that the grain of the SMA/La2O3 composite coating is significantly refined. When doping with 0.9 wt.%, the refinement rate reaches 19%. Furthermore, based on the Hall–Petch effect, the microhardness of the SMA/La2O3 composite coating is increased to 450 HV0.2. At the same time, the anti-corrosion of the composite coating is enhanced due to the smaller grain size and fewer defects.

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Section: Phases Analysissupporting

confidence: 70%

Section: Microstructuresupporting

confidence: 67%

Effect of La2O3 on Microstructure and Properties of Laser Cladding SMA Coating on AISI 304 Stainless Steel

Liu

Qiao

2022

Coatings

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“…The Nb content in Laves phase was more than that of the gray area of FCC, which had a higher atomic mass than Ni, Cr, or Fe and thus appeared as white sites in backscattered electron mode. 20 Besides, as the alloying of Nb powder in molten pool was an exothermic reaction and the formation of Laves phase also released the heat of crystallization, 21 the cooling rate of molten pool decreased to a certain extent, which endowed the entrapped bubbles with more time to escape. However, the distribution of Laves-phase particles was discrete, and their dendritic size was fine because the mobility of new grain nucleation decreased, and the growth rate was limited due to the addition of low amount of Nb.…”

Section: Coating Microstructure Analysismentioning

confidence: 99%

Microstructure and anti-corrosion performance of laser cladded Nb-modified Ni-based alloy coatings

Chen

Wang

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, Ni-based alloy coatings incorporated with Nb mass fractions of 0%, 3%, 6%, and 9% were successfully fabricated by laser cladding. The morphology, chemical composition, and phases of the obtained Nb-modified Ni-based coatings were characterized, and the effects of Nb contents on their electrochemical performance and immersion rates in 3.5 wt% NaCl solution were analyzed. The results show that the Ni-based coating with low Nb exhibits the most compact and refined microstructure, the best electrochemical passivation, and the lowest immersion corrosion rate of 3.30 × 10−3 mm/year. However, with increasing Nb content, the Laves phase is accumulated, and dendritic growth is promoted, which significantly decreases the coating passive stability and worsens the anti-corrosion performance.

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“…However, the wear and corrosion resistance of Febased alloy cladding layers are limited, which cannot meet the performance requirements of some application fields [4][5][6]. Therefore, researchers have considered to add alloying elements into Fe-based alloy to improve the properties of the coatings [7][8][9][10][11][12][13]. For example, Gao et al [10] studied the effect of Ti content on the microstructure and hardness of laser cladding Fe-based coating.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, wear and electrochemical behaviors of laser cladding Fe-based coatings with various molybdenum contents

Li¹,

Wang²,

Zhang³

et al. 2022

Mater. Res. Express

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Fe-based alloy coatings with different Mo contents were fabricated on 45 steel substrates by laser cladding. X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to analyze the phase composition and microstructural evolution of the coatings. The effects of Mo addition on the wear and electrochemical behaviors of the coatings were analyzed by ball-on-disc wear tester and electrochemical workstation. The results showed that the addition of Mo could help refine grains and promote the transition of dendrites to equiaxed grains. With the increase of Mo content, the hard phases changed from Fe2B to Mo2FeB2. Mo and Cr tend to aggregate in the intercrystalline regions in the form of hard phases. When the Mo content was 4.8 wt.%, the hardness increased by 3.6 times compared with that of the substrate. The wear resistance of the coatings increased with the Mo addition. Mo played the role of fine grain strengthening and solid solution strengthening, which was beneficial for the improvement of the hardness and wear resistance. Polarization curves and electrochemical impedance spectroscopy test results revealed that the addition of Mo could improve the corrosion resistance of Fe-based coating.

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Microstructure and properties of laser clad Fe-based amorphous alloy coatings containing Nb powder

Cited by 33 publications

References 39 publications

Effect of La2O3 on Microstructure and Properties of Laser Cladding SMA Coating on AISI 304 Stainless Steel

Effect of La2O3 on Microstructure and Properties of Laser Cladding SMA Coating on AISI 304 Stainless Steel

Microstructure and anti-corrosion performance of laser cladded Nb-modified Ni-based alloy coatings

Microstructure, wear and electrochemical behaviors of laser cladding Fe-based coatings with various molybdenum contents

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