Residual stress distribution in different depths of TiNi/Ti 2 Ni-based laser clad coating prepared at different environmental temperatures

Tao, Y.F.; Li, Jun; Lu, Y.; Li, Jun

doi:10.1016/s1003-6326(17)60229-2

Cited by 26 publications

(8 citation statements)

References 28 publications

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“…Therefore, determining how to reduce the deformation of thin-walled parts during laser cladding repair has become the focus of a body of research. The formation reason and action rules of stress and deformation in laser cladding are very complex, and many experts and scholars have conducted many related investigations on this topic [16][17][18][19][20][21][22]. Wang et al [23] used different types of lasers to study the properties of formed AISI316L stainless steel thin-walled parts, and found that the ultimate tensile strength of the sample produced by a pulse laser was higher than that of the sample produced by a continuous-wave laser.…”

Section: Introductionmentioning

confidence: 99%

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Huang

2020

Coatings

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To reduce the deformation and improve the quality of thin-walled parts repaired by laser cladding, a three-factor, three-level orthogonal experimental scheme was employed to clad Ni60 powder on thin-walled parts with a thickness of 3.5 mm. To measure the deformation of the thin-walled parts, a method of combining the meshing of the backs of the thin-walled parts and fixing one end of the parts during cladding was used. The effects of the powder feed rate, laser power, and scanning speed on the deformation of the thin-walled parts were studied via visual analysis and analysis of variance, and the process parameters that resulted in the minimum deformation were determined. The deformation process of the thin-walled parts and the causes of cladding stress were also studied, and the microstructure of the cladding layer with the minimum deformation was analyzed via scanning electron microscopy (SEM). The results reveal that the deformation of the thin-walled parts increased with the increase of laser power. The increases of the scanning speed and powder feed rate were found to reduce the deformation of thin-walled parts; the laser power was found to have a significant effect, and the powder feed rate was found to have no significant effect, on the deformation of thin-walled parts. The order of the influence of factors on the deformation of thin-walled parts from greatest to least was determined to be as follows: laser power > scanning speed > powder feed rate. The optimal parameters to obtain the minimum deformation and good metallurgical bonding of thin-walled parts were found to be a powder feed rate of 1.4 r/min, a laser power of 1100 W, and a scanning speed of 8 mm/s. From the bottom to the top, the crystal structure of the coating with the minimum deformation was found to be coarse dendrite, dendritic crystal, and equiaxed crystal.

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Section: Introductionmentioning

confidence: 99%

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Huang

2020

Coatings

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“…Based on the aforementioned analysis, it was speculated that the following reactions (1)-( 5) might occur in the molten pool [26,27].…”

Section: Microstructural Characterizationmentioning

confidence: 99%

“…Therefore, for the Ti 2 SC-Ti 2 Ni mosaic structure composite phase, Ti 2 SC was the substrate phase and Ti 2 Ni was the nucleation phase. The unit cell models of Ti 2 SC and Ti 2 Ni are illustrated in Figure 8 with their lattice parameters [27,32] shown in Table 7. To obtain a better interfacial matching relationship of Ti 2 Ni and Ti 2 SC, the lowindex crystal faces were selected for the calculation of the two-dimensional lattice misfit.…”

Section: Formation Mechanism Of the Ti 2 Sc-ti 2 Ni Mosaic Structure ...mentioning

confidence: 99%

Microstructure and Tribological Properties of Lubricating-Reinforcing Laser Cladding Composite Coating with the Ti2SC-Ti2Ni Mosaic Structure Phase

et al. 2022

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Lubricating-reinforcing composite coatings were successfully prepared on Ti6Al4V using laser-clad Ti6Al4V/Ni60/Ni-MoS2 mixed powders with different Ni-MoS2 contents (25, 35, and 45 wt.%), and their microstructure and tribological properties were studied. The reinforcing phase TiC, Ti2Ni, and the lubricating phase Ti2SC were in situ precipitated while Ti2SC and Ti2Ni formed a mosaic coherent structure within the above three coatings. In the 25 and 45 wt.% Ni-MoS2 coatings, the microstructure distribution uniformity of the coatings was not effectively improved by the Ti2SC-Ti2Ni mosaic structure phase due to the lower or higher content of Ti2SC. In the 35 wt.% Ni-MoS2 coating, the forming quality of the coating was the best due to an appropriate amount of the uniformly distributed Ti2SC-Ti2Ni mosaic structure phase. Furthermore, the microhardness of the coatings gradually decreased as the amount of Ni-MoS2 increased. In the 35 wt.% Ni-MoS2 coating, due to the uniformly and diffusely distributed Ti2SC-Ti2Ni mosaic structure phase, the stable lubricating-reinforcing mosaic structure transfer composite films were formed during the progress of the friction and wear tests, which led to the optimal worn surface evenness and quality, the anti-friction and the wear resistance properties compared with the Ti6Al4V, 25 and 45 wt.% Ni-MoS2 coating.

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“…Y.F. Tao et al [16] studied the residual stress distribution in different depths of TiNi/Ti 2 Ni-based laser clad coatings prepared at different environmental temperatures. Results showed that the average residual stress in the coating prepared at 25 °C was the largest.…”

Section: Introductionmentioning

confidence: 99%

Crack Restraining Methods and their Effects on the Microstructures and Properties of Laser Cladded WC/Fe Coatings

2018

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Laser cladded WC/Fe coatings have the advantages of low cost and high abrasion wear resistance. However, cracks always appear in WC/Fe coatings, which limits their industrial application. In this paper, the co-effects of the re-melting process, heat treatments, and amount of Co element on the cracking susceptibility, microstructures, and mechanical properties of WC/Fe laser cladding coatings were studied. Experimental results show that re-melting process is helpful to improve the surface quality of the coating and to reduce the cracking susceptibility. The hardness of the coating decreases slightly but distributes more uniformly. Cracks in the coating can be inhibited effectively by preheating the substrate to 250 °C and maintaining the temperature during the laser cladding process, as well as applying an annealing treatment at 300 °C for 1 h. Heat treatment also results in a slight decrease in the hardness. Crack initiation cannot be restrained completely by applying the above two methods when laser cladding a big area of coating. On the basis of the above two methods, addition of Co element to the coating can further improve its toughness and decrease the crack susceptibility. Crack-free WC/Fe coating can be manufactured when 8% Co is added, and its wear resistance is much better than that of the hardened medium steel, especially when the wear time is long.

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Residual stress distribution in different depths of TiNi/Ti 2 Ni-based laser clad coating prepared at different environmental temperatures

Cited by 26 publications

References 28 publications

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Microstructure and Tribological Properties of Lubricating-Reinforcing Laser Cladding Composite Coating with the Ti2SC-Ti2Ni Mosaic Structure Phase

Crack Restraining Methods and their Effects on the Microstructures and Properties of Laser Cladded WC/Fe Coatings

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