Study On The Effect Of Power Spinning On The Wear Resistance Of Laser Cladding Coatings And The Mechanism

The rapid growth of traditional industrial equipment drives a significant share of highvalue-added heavy equipment to the point of end-of-life,increasing resource and energy waste.High-speed laser cladding uses a synchronous powder feeding method,accumulates on the top of the substrate,melts,and cools through laser beam irradiation express,forming a metallurgical bond with the substrate into the coating,which can repair damaged parts and extend their service life.The shape and size of the formed surface are difficult to meet the requirements of use due to the limitations of the laser cladding process.At the moment,the main processing means are a combination of traditional mechanical processing methods and laser cladding technology.However,traditional equipment inevitably leads to waste of coating material.Surface enhancement methods are consequently utilized to laser cladding coatings to enhance the floor’s fantastic coating whilst in addition optimizing the coating properties.In this paper,Fe-19.66 Cr-2.69Ni-1.06Si-0.1C(wt%)coatings have been prepared on27 Si Mn steel.To inspect the effect of the range of spinning passes on the high-speed laser cladding coating.To set up a finite factor mannequin of the excessive velocity laser cladding cartridge by using the use of numerical simulation.To apprehend the stress modifications in the floor layer of the coating,the stress-strain in the coating after more than one pass and the bulge in the working vicinity of the spinning wheel.The outcomes exhibit that: the coating floor as a complete is flatter after the second pass,the fluctuation is reduced,the floor nice has been increased to a sure extent,the phenomenon of necking starts to appear,the universal despair of the motion quarter has reached about 0.4mm,the steady spinning stage,the floor layer produces large deformation beneath the motion of the spinning wheel,the equal pressure will increase from 361 MPa to 466 MPa,for the bonding zone,the amplify of 50 MPa after the second spinning can decrease the impact of the pressure on the bonding zone.Based on the numerical simulation,the first and second passes of the laser cladding coating by power spinning were conducted,in which the press-down amount was 20 μm,the rotational speed was 600 r/min and the feed rate was 2 mm/r.The surface morphology,tissue evolution mechanism,and micromechanical property changes of the coating under different spinning passes were studied by SEM,XRD,EBSD,TEM,etc.It is concluded that the floor grain tilts in the feed route as the wide variety of spinning passes increases.The floor layer is sophisticated and the deformed tissue is usually allotted in the floor layer.As the number of passes increased,the share of deformed tissue increased,and extra low-angle grain boundaries and geometric dislocations appeared.Power spinning can efficiently enhance the macroscopic forming highquality of the cladding layer.The spinning wheel acts countless times.The wave height metallic on the coating floor flows to the wave valley,which reduces the floor roughness of the cladding layer.The mixed impact of grain refinement and extended dislocation density will increase the microhardness of the floor layer.Further frictional wear assessments exhibit that the transformation of the put on mechanism after power spinning is conducive to bettering the put on resistance of the coating.However,spinning motives a giant plastic deformation of the coating surface,ensuing in a bloodless deformation shape that leads to a giant residual stress in the fashioned coating.The residual stress,microhardness,and put on resistance have been measured by way of annealing at 350°C,450°C,and 550°C for two hours.The effects confirmed that the residual stresses in the coating have been drastically decreased after warmness treatment.The hardness of the floor layer of the molten coating confirmed a positive reduction with the extend of temperature in the vary of the check parameters.After stress remedy annealing at 350°C,the dendritic eutectic is uniformly sophisticated and the business enterprise turns extra dense and the dislocation density is reduced.The power of the cloth is decreased and the plasticity is increased displaying higher put on resistance.In summary,the post-treatment of high-speed laser cladding coatings the use of an effective spinning technique used to be investigated.The impact of spinning passes on the put on resistance of the coatings was studied to divulge the microstructure and tissue evolution of the effective spinning laser cladding coatings.It is proposed to enhance the floor morphology and roughness of the molten coating and similarly beautify the put on resistance,offering a new answer for the coating post-treatment.It helps to expand the software area of effective spinning and promotes the utility and improvement of high-speed laser cladding.