Laser cladding of Fe-based corrosion and wear-resistant alloy: Genetic design, microstructure, and properties

For improving wear resistance and hardness, Ni60 coatings were applied to TC4 alloy using laser cladding techniques. The effects of different lap ratios on the microstructure, microhardness, and wear resistance of the Ni60 coating were analyzed using an ultra-deep field microscope, XRD, microhardness tester and wear testing machine, and a suitable lap ratio was sought to obtain a coating with a better performance. The results showed that the Ni60 coatings with a 30% lap ratio had the best morphology and no obvious defects. From the bottom to the top, there are coarse columnar crystals, fine columnar crystals, equiaxed crystals, and acicular crystals, mainly composed of γ-Ni and some Cr7C3 and Cr23C6 phases. Therefore, the suitable lap ratio is 30%, and the microhardness of the coating at this parameter is 900 HV, which is about 2.5 times of the substrate (360 HV). The wear amount of the coating is 5.05 mg, which is about 11% of the substrate (44.23 mg). The average friction coefficient of the coating is about 0.41, which is 63% of the substrate (0.65). TC4 alloy’s wear resistance and microhardness can be significantly improved by applying suitable coating material and laser cladding parameters.

Section: Physical Phase Composition and Microstructurementioning

confidence: 96%

The Effect of Laser Cladding Lap Ratio of TC4 Alloy on Microstructure and Properties of Ni60 Coating

Wang,

Li,

Peng

et al. 2023

“…The main phases are γ- Ni, Cr 3 C 2 , TiC, TiNi, Cr 3 Ni 12 , etc. The highest peak intensity of γ-Ni indicates that this is the preferred orientation for grain boundary growth [10]. Laser cladding is a fast solidification process, and the properties depend heavily on the solidification tissue.…”

Section: Microstructure Of the Cladding Layermentioning

confidence: 99%

The Microstructure and Properties of Ni60 cladding layer by Laser Cladding on TC4 Alloy Surface

Wang,

Li,

Peng

et al. 2023

Laser cladding was used to prepare a Ni60 cladding layer on the surface of TC4 alloy to enhance its hardness and wear resistance. Single-factor experiments were conducted to compare the effects of laser power, powder feeding speed, and scanning speed on the morphology, dilution rate, and microhardness of the Ni60 cladding layer. Based on fewer cracks, high hardness, and moderate dilution rate, the optimum parameters were determined. According to the results, when the laser power was 1000 W, powder feeding rate was 1.8 r/min, and scanning speed was 6 mm/s, the Ni60 cladding layer was crack-free, bonded to the TC4 substrate by metallurgical means, with a columnar and equiaxed crystalline microstructure, consisting of γ-Ni, Cr3C2, TiC, TiNi, Cr3Ni12 phases, etc. Compared to the TC4 substrate, the Ni60 cladding layer is about 2.30 times harder with an average microhardness of 836.71 HV1. Ni60 cladding layer and TC4 substrate had friction coefficients of 0.39 and 0.63, the weight loss was 21 mg and 115 mg, and the wear mechanisms were abrasive wear and adhesive wear, respectively. According to the results, the Ni60 cladding layer effectively enhances the TC4 substrate’s microhardness and wear resistance.

“…It is possible to use the welding technology completely without inventing new equipment and technology, and welding has unique advantages in industrial application. Wear-resistant cladding metal for carbon steel can generally be divided into Fe-based alloys, nickel-based alloys and Co-based alloys, among which Fe-based alloys are widely studied for their low cost, good wear resistance and good bonding properties [10][11][12]. The typical representative is Fe-Cr-C wear-resistant coating, which enhances the materials hardness by forming M 7 C 3 hard phase.…”

Section: Introductionmentioning

confidence: 99%

Study on Wear Behavior of Coatings Fabricated by Additive Manufacturing Technology on the Surface of Guide Shoe of Shearer

Yang

Zhang

Chen

et al. 2023

This paper aims to obtain a fine wear-resistance cladding that can be applied in guide shoe of shearer. The performance of two cladding claddings fabricated by additive manufacturing technology, no chromium-high carbon (NCrHiC) claddings and high chrome-high carbon (HiCrHiC) claddings, was analyzed through a series of characterization experiments (optical microscope, hardness, coefficient of friction, wear rate, and surface morphology). The experimental results show that the NCrHiC cladding has obvious cracks and cracks are not observed on the surface of HiCrHiC cladding. However, the hardness and wear resistance of NCrHiC cladding is better than that of HiCrHiC cladding. The microstructure of NCrHiC cladding is composed of carbides, pearlite and ledeburite, and the one of HiCrHiC cladding is M(Fe, Cr)7C3 carbides and martensite. The worn width of HiCrHiC cladding is higher than that of NCrHiC cladding. Wear mechanism of NCrHiC cladding is abrasive wear while the one of HiCrHiC cladding is adhere wear.