Microstructure and mechanical properties of in situ (Ti, Nb)Cp/Fe-based laser composite coating prepared with different heat inputs

Li, Qingtang; Liu, Yongping; Fu, Hanguang; Wu, Zhongwei; Lin, Jian

doi:10.1007/s12598-015-0685-0

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…The BCC solid solution mainly consisted of an iron-based and a chromium-based solid solution, and the carbides were identified as (Nb, Ti)C due to the strong carbide formation ability of the elements Nb and Ti. In the laser cladding process, the Nb and Ti formed (Nb, Ti)C carbides with C atoms contained in the substrate [26]. After annealing, the BCC solid solution and the FCC structural (Nb, Ti)C carbides remained almost unchanged, while only a small amount of Laves phase was observed.…”

Section: Crystal Structure Observationmentioning

confidence: 99%

“…It can be seen from Figure 2a that the as-deposit coating was mainly composed of BCC solid solution and FCC structural (Nb, Ti)C carbides, while a small amount of Laves phase was also produced in the as-annealed coatings. In terms of the Valance Electron Concentration (VEC) [25,26], the VEC for CrFeMoNbTiW HEA coating has been calculated as 5.2. According to [25], when the VEC value of an HEA is less than 6.8, a BCC solid solution will be formed in the HEA.…”

Section: Crystal Structure Observationmentioning

confidence: 99%

“…Furthermore, the Fe content was much higher than that of other elements and C appeared in the ID area. This is because a certain volume of the substrate melted during the laser-cladding process and mixed with the HEA coating [26]. The working temperature of the laser spot reaches 3500 • C, which is far beyond the melting point of the Q245R substrate (c. 1371-1538 • C), thus it is common for the substate to melt when using the laser cladding technique [29].…”

Section: Microstructuresmentioning

confidence: 99%

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Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Shen

Zhao

et al. 2021

Crystals

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In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using X-ray diffraction (XRD), a scanning electron microscope (SEM), a Vickers hardness tester and a roller friction wear tester. The results showed that the coating was mainly composed of body-centered cubic (BCC) solid solution and face-centered cubic (FCC) structural (Nb,Ti)C carbides prior to annealing, exhibiting an interdendritic structure and needlelike dendritic crystal structure with average microhardness of 682 HV0.2. The coarsening of the dendrite arms increased gradually after a 10-h long annealing treatment at 800 °C, 900 °C and 1000 °C, and a small amount of Laves phase was produced. After annealing, the highest microhardness value of the as-annealed coating reached 1176 HV0.2, which represents an increase of approximately 72.5% compared to that of the as-deposit coating. The wear resistance testing results imply that this type of coating retains good wear resistance following the annealing treatment and that its wear resistance increases in proportion to the annealing temperature in a range from 800 °C to 1000 °C.

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Section: Crystal Structure Observationmentioning

confidence: 99%

Section: Crystal Structure Observationmentioning

confidence: 99%

Section: Microstructuresmentioning

confidence: 99%

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Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Shen

Zhao

et al. 2021

Crystals

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“…9 Among these technologies, laser cladding has the advantages of small deformability and good metallurgical bonding with the coatings. 10,11 It has become one of the most promising technology of surface modification, which could significantly improve surface quality of substrate. However, the coating material is quite different from the substrate material.…”

Section: Introductionmentioning

confidence: 99%

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

Gong

Miao

et al. 2021

Advances in Mechanical Engineering

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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.

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“…Considering performance-price ratio of the cladding materials, Fe-based alloy powders show good application prospects owing to their low cost and high wear resistance [5,6]. However, under severe working conditions, pure Fe-based cladding layers can no longer meet the requirements and carbide (e.g., NbC, TiC, VC, and WC) reinforced Fe-based composite cladding layers have attracted widespread attention [7][8][9][10][11]. Due to the different corrosion potential, there will generate galvanic corrosion between carbides and Fe-based layer matrix in corrosion medium.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Dry Sliding Friction Properties of In-Situ Micron and Submicron (Ti-V)C Reinforced Fe-Based Laser Cladding Layers

Liu

Zhang

Xiao

et al. 2020

Metals

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By optimising the particle size of cladding alloy powders, in situ micron and submicron (Ti-V)C reinforced Fe-based laser cladding layers were prepared and the dry sliding friction properties were comparatively studied. Results showed that there were same phases of α-Fe, γ, TiC, and TiVC2 in the two cladding layers. The average grain size of the Fe-based matrix was 3.46 μm and 3.37 μm, the microhardness was 731 HV0.2 and 736 HV0.2, and the area ratio of carbides was 11.14% and 11.02%, respectively. The dry sliding wear resistance of the cladding layer reinforced by 1.95 μm carbides was 2.76 times higher than that of the 0.49 μm carbides. The failure mechanism of the cladding layer with the micron carbides was mainly caused by plastic deformation of the cladding layer matrix, whereas that of the submicron carbides involved both the plastic deformation of the cladding layer matrix and the abrasion that was caused by the peeled carbides.

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Microstructure and mechanical properties of in situ (Ti, Nb)Cp/Fe-based laser composite coating prepared with different heat inputs

Cited by 3 publications

References 16 publications

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

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

Comparative Study on the Dry Sliding Friction Properties of In-Situ Micron and Submicron (Ti-V)C Reinforced Fe-Based Laser Cladding Layers

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Microstructure and mechanical properties of in situ (Ti, Nb)Cp/Fe-based laser composite coating prepared with different heat inputs

Cited by 3 publications

References 16 publications

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

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

Comparative Study on the Dry Sliding Friction Properties of In-Situ Micron and Submicron (Ti-V)C Reinforced Fe-Based Laser Cladding Layers

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