Numerical simulation based radial laser cladding process optimisation for annular thin-walled parts
0
Citation
0
Reference
10
Related Paper
Keywords:
Cladding (metalworking)
Cladding (metalworking)
Cite
Citations (0)
For the sake of enhancing hardness and wear resistance of Ti based materials, 50 vol% (TiB + TiC)/Ti64 composite coatings with different TiB/TiC ratios were fabricated by gas tungsten arc cladding (GTAC) on the network structured 3.5 vol% TiBw (TiB whisker)/Ti64 substrate. The results showed that primary TiB and TiC exhibited much larger sizes than their eutectic counterparts, and the two-scale reinforcements formed by the dissolution-precipitation mechanism predominated the hybrid coatings. In particular, most TiC was embedded within the TiB prism displaying an intergrowth structure with "dissimilar-joining" characteristic, which contributed to the hardness and wear resistance improvement. The remarkable hardness improvement was attributed to the following three-fold mechanisms: (a) load transfer strengthening from the primary TiB and TiC; (b) Orowan strengthening from the eutectics; and (c) Hall-Petch strengthening from the refined Ti64 matrix. Moreover, the plastic deformation resistance was significantly improved by the hybrid reinforcements, leading to the enhanced the anti-abrasion performance. Consequently, the coating exhibited a comparatively low wear rate (7.35 × 10−5 mm3·N−1·m−1) compared with the substrate (54.89 × 10−5 mm3·N−1·m−1), and the corresponded wear mechanisms are summarized as: brittle debonding, oxidation and slight micro-ploughing.
Cladding (metalworking)
Cite
Citations (65)
The powder mixture of Co based alloy (Stellite 6) and vanadium carbide (VC) in the range of 0–56 wt-%VC fraction with a constant chemical composition multilayer cladding (CCCMLC) and functionally gradient material multilayer cladding (FGMMLC) were deposited on stainless steel (SUS304) by a 2·4 kW CW CO 2 laser and powder feeder. In the CCCMLC, the VC weight fractions at each layer are constant. In the FGMMLC, the VC weight fractions at each layer are varied by controlling the disc rotation speed of the powder feeder. To decrease crack sensitivity of the clad layer, influence of preheating temperature and VC weight fraction using the CCCMLC and FGMMLC on the crack sensitivity was investigated comparatively. As a result, in the FGMMLC with gradual increase in VC particles, clad at three subsequent layers shifts the critical amount of VC at which cracking appears to be the highest level, or it reduces the required preheating temperature, namely, the crack sensitivity of the clad layer using FGMMLC is lower than that using CCCMLC. On the other hand, the microstructure, Vickers hardness and wear resistance of the clad layer were investigated by an X-ray diffractometer, energy dispersion spectroscopy (EDS), scanning electron microscope (SEM), laser microscope, wear tester and hardness tester. Microstructures of the clad layer were classified into two types, hypoeutectic structure and hypereutectic structure. The wear resistance of clad layer made by CCCMLC and FGMMLC has been almost the same.
Stellite
Diffractometer
Cladding (metalworking)
Vanadium carbide
Cite
Citations (5)
Cladding (metalworking)
Laves phase
Cite
Citations (20)
Cladding (metalworking)
Cite
Citations (0)
Cladding (metalworking)
Characterization
Cite
Citations (13)
AbstractAbstractNiCrAl/20%WC coatings were prepared by laser cladding on 45 steel under different technological parameters. The effects of technological parameters on the microstructure, microstructure, hardness and wear resistance were investigated. The results show that with the increase of the scanning speed, the height, width, depth and dilution rate of the cladding layer gradually decrease, the microstructure becomes smaller and smaller, the hardness gradually increases, and the wear amount decreases first and then increases, and the wear amount is the least when the scanning speed is 600 mm/min. With the increase of laser power, the height, width, depth and dilution rate of cladding layer gradually increase. The hardness gradually decreases; The wear decreases first and then increases, and the wear is the least when the laser power is 1.2 kW.Keywords: Laser claddingprocess parameterswear-resisting performance Additional informationFundingThe work was supported by Xi’an Science and Technology Project No. 22GXFW0120-5, and the Team of Shaanxi Intelligent Remanufacturing Technology; Natural Science Basic Research Program of Shaanxi No.2022JM-187.
Cladding (metalworking)
Dilution
Remanufacturing
Cite
Citations (0)
In this study, 316L stainless steel repaired layers were fabricated on a 27SiMn steel substrate using weld surfacing and laser cladding, respectively. The microstructures of repaired layers were subjected to dedicated characterizations using X-ray diffraction, electron backscatter diffraction and energy dispersive spectrometry, with their surface properties (corrosion and wear performances) measured and correlated with the revealed microstructure features. Both the weld-surfacing and the laser-cladding repaired layers (RLs) are found to be mainly comprised of columnar-grained γ-Fe phase, with their average grain widths measured as 17.0 ± 20 μm and 15.3 ± 13.7 μm, respectively. Between their RLs and substrates, an unreported transition layer (∼50 μm in thickness) jointly composed of γ-Fe and α-Fe is identified. After surface property tests, the RL fabricated by the laser cladding shows superior corrosion and wear resistance to that of the weld surfacing. Comprehensive analyses based on their microstructure features suggest that the better performance of the laser-cladding RL can be ascribed to the laser-induced ultrafast cooling that allows denser and finer grain structures to be produced.
Cladding (metalworking)
Cite
Citations (36)
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 Co 3 W 3 C 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.
Cladding (metalworking)
Cite
Citations (3)
Cladding (metalworking)
Cite
Citations (2)