Microstructure evolution and defect characteristics of multilayer Fe-Cr alloy coatings fabricated by laser melting deposition

Yue, Haitao; Lv, Ning; Guo, Chenguang; Zhao, Lijuan; Li, Qiang; Zhang, Jianzhuo; Zhang, Yin

doi:10.1016/j.optlastec.2022.108802

Cited by 10 publications

(5 citation statements)

References 32 publications

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“…The fracture location of the specimen is always located in the defect region of pores and cracks and is related to the number of porosity [26]. Previous studies have found that the porosity of multilayer Fe-Cr alloy coatings increases with the increasing laser energy density [30]. Fig.…”

Section: Tensile Propertiesmentioning

confidence: 95%

“…Aiming to study the effect of laser energy density on the mechanical properties of Fe-Cr alloy coatings, the different laser power of 900 W, 1100 W, 1300 W, 1500W and scanning speed of 10 mm/ s, 12 mm/s, 14 mm/s were employed. Table 2 exhibits the laser energy density calculated adopting the following formula [28,30]:…”

Section: Materials and Experimental Processmentioning

confidence: 99%

“…Therefore, it is considered that the grain size is one of the main factors affecting the tensile properties and the appropriate laser energy density is beneficial to improve the tensile strength and toughness of Fe-Cr alloy coatings fabricated by DED technology. and Cr2B) [30] and the amorphous forming ability of B and Si elements are the main reason for the significant hardness improvement of Fe-Cr alloy coatings. Due to the diffusion of eutectic compounds, the microhardness from the fusion zone to the substrate decreases gradually.…”

Section: Fig2 Effects Of Laser Energy Densities On Tensile Propertiesmentioning

confidence: 99%

“…The above results indicate that appropriate laser energy density is beneficial to obtain better mechanical properties of the coating, but there is still a lack of a comprehensive understanding, especially residual stress and fatigue thermal damage. In the previous work, we preliminarily explored the mechanism of different laser energy densities on the microstructure and defects of Fe-Cr alloy coatings [30], but the previous experiments did not focus on the effects on the mechanical properties. Therefore, it is crucial to establish an effective framework to systematically reveal the comprehensive understanding of laser energy density on the mechanical properties of Fe-Cr alloy coatings.…”

Section: Introductionmentioning

confidence: 99%

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Effects of energy density on the mechanical properties, residual stress and thermal-fatigue of Fe-Cr alloy fabricated by laser directed energy deposition

Yue¹,

Lv²,

Guo

et al. 2022

Preprint

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Aiming at the problem that AISI4340, a common material for fully mechanized coal-mining equipment, is prone to wear failure in harsh working environment. To repair damaged area and improve service performance, the high-strength Fe-Cr alloy coatings having different laser energy densities were fabricated on the AISI4340 by laser directed energy deposition. The effects of the energy densities on the tensile properties, hardness, residual stress, wear and thermal-fatigue damage were systematically studied. The models of thermal-fatigue damage and service life were established and improved, and the prediction accuracy were verified. The results indicated that with the increasing energy density, the tensile strength and Rockwell hardness increased first and then decreased, and the residual stress on the coating surface aggrandized with increasing temperature gradient. When the energy density was 35.01 J/mm2, the wear depth and wear rate were 51.8 µm and 1.91×10− 2 mm3∙N− 1∙mm− 1, and the wear resistance was increased by two times compared with the substrate. Considered the effective crack propagation and loading order, the accuracy of the service life models were improved from 65.9% and 23.1–14.6% and 6.7%, respectively. Selecting appropriate energy density is beneficial to improve the mechanical properties and decrease the thermal-fatigue damage of Fe-Cr alloy coatings.

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Section: Tensile Propertiesmentioning

confidence: 95%

Section: Materials and Experimental Processmentioning

confidence: 99%

Section: Fig2 Effects Of Laser Energy Densities On Tensile Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of energy density on the mechanical properties, residual stress and thermal-fatigue of Fe-Cr alloy fabricated by laser directed energy deposition

Yue¹,

Lv²,

Guo

et al. 2022

Preprint

Self Cite

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“…The supercooling of columnar crystals is higher than the nucleation cooling rate, so the solidification interface grows in the form of dendrites. The crystals grow freely in the undercooled melt via the nucleation that occurs in front of the solid-liquid interface and finally form anisotropic equiaxial dendrites [33]. The microstructure of the cladding layer is dense, the crystals are uniformly distributed, and there are no obvious defects such as pores and cracks inside, which proves that the optimized internal cladding layer has good forming quality.…”

Section: Experimental Verificationmentioning

confidence: 96%

Multi-Objective Process Optimization of Laser Cladding Co-Based Alloy by Process Window and Grey Relational Analysis

Yue

Guo

et al. 2023

Coatings

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To determine the optimal process parameters for the preparation of a Co-based alloy cladding layer, the experimental research of laser cladding Co-based alloy was carried out based on the optimal process window and grey relational analysis methods with 42CrMo as the substrate. The analysis of variance (ANOVA) was used to explore the influence laws of laser process parameters on the forming characteristics of the cladding layer within the optimal process window range. Furthermore, the optimal process parameter combination was obtained by grey relational analysis, and the experimental verification of the optimization results was conducted. It was found that the process parameter interval determined by the optimal process window was laser power 1300–2100 W, scanning speed 6–14 mm/s, and powder feeding rate 17.90–29.84 g/min. The influence order of each process parameter was: laser power > scanning speed > powder feeding rate. The optimal process parameters of laser power 2100 W, scanning speed 6 mm/s, and powder feeding rate 17.90 g/min were obtained. The experimental verification results of optimal process parameters proved that the grey correlation grade of the optimized parameters was improved by 0.260 compared with the initial parameters and agreed well with the prediction value with an accuracy of 96%. After optimization, the cross-sectional area, the ratio of the width to height, cladding efficiency, and powder utilization rate of the cladding track increased by 4.065 mm2, 1.031, 19.032, and 70.3%, respectively, and the fluctuation ratio decreased by 60.9%. The optimal cladding track was well bonded to the substrate without cracks, holes, and evident element segregation, and included the phases of Cr3C7, CoCx, fcc-Co, and WC.

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Effects of energy density on the mechanical properties, residual stress, and fatigue damage of Fe-Cr alloy fabricated by laser-directed energy deposition

Yue

Guo

et al. 2023

Int J Adv Manuf Technol

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Microstructure evolution and defect characteristics of multilayer Fe-Cr alloy coatings fabricated by laser melting deposition

Cited by 10 publications

References 32 publications

Effects of energy density on the mechanical properties, residual stress and thermal-fatigue of Fe-Cr alloy fabricated by laser directed energy deposition

Effects of energy density on the mechanical properties, residual stress and thermal-fatigue of Fe-Cr alloy fabricated by laser directed energy deposition

Multi-Objective Process Optimization of Laser Cladding Co-Based Alloy by Process Window and Grey Relational Analysis

Effects of energy density on the mechanical properties, residual stress, and fatigue damage of Fe-Cr alloy fabricated by laser-directed energy deposition

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