Examination of the sliding wear of bronze coatings on railway buffer heads

Gamon, Wojciech; Aniołek, Krzysztof

doi:10.1016/j.wear.2020.203235

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…An example of these purposes is the increase of material properties, such as the wear resistance [1], the corrosion resistance [2], the surface hardness [3], or the toughness [4] of the materials generated, among others. Many researchers have reported beneficial attempts in terms of applying this technology in the field of rail transit, particularly for studying the microstructure [5,6], mechanical properties [7,8], residual stress [9,10], and wear and rolling contact fatigue [11][12][13][14][15][16] of laser-cladded wheels and rails. Wang et al [17] applied laser cladding technology for repairing wheel and rail materials, focusing on evaluating the hardness and wear resistance of the specimens after laser cladding.…”

Section: Introductionmentioning

confidence: 99%

Damage and Fatigue Life Evaluation for Laser Cladding Remanufactured Wheel

Hua

Zhou

2022

Advances in Materials Science and Engineering

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Owing to high speeds and heavy loads, the wheels of trains and locomotives undergo gradual but significant damage. Conventionally, these damaged wheels are repaired using the rotatory repair method; however, this approach results in large amounts of material waste. To address this issue, in this study, laser cladding remanufacturing technology was employed to repair a damaged wheel. The contact stress and creep characteristics of the cladded wheel were determined using Simpack, a dynamic simulation software program. The existing damage function model, which is based on the wear number, was modified, and this modified model was used to perform damage assessments for the remanufactured wheel. Furthermore, a life evaluation model for wheels remanufactured using this laser cladding technology was established. The service life of the cladded wheel calculated using this model was in good agreement with the design life of the wheel.

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Section: Introductionmentioning

confidence: 99%

Damage and Fatigue Life Evaluation for Laser Cladding Remanufactured Wheel

Hua

Zhou

2022

Advances in Materials Science and Engineering

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“…It is known that the damaged parts repaired by laser directed energy deposition (DED) technology has been widely used in industry applications, such as railway equipment [6][7][8],…”

Section: Introductionmentioning

confidence: 99%

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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“…LPF-AM is an advanced surface modification technology that utilizes a high-energy laser beam to melt material to achieve metallurgical combination with the substrate for fabricating high-performance coatings, such as for high-temperature resistance, 1,2 corrosion resistance, 3 and wear resistance. 1–5 LPF-AM is widely adopted for key part surface performance improvement and remanufacturing in the fields of aerospace, 6 railways, 7,8 and ship traffic. 9 To obtain a cladding layer with significant improvement, a large number of experiments are required to explore the influence of variable process parameters on forming quality.…”

Section: Introductionmentioning

confidence: 99%

Forming quality optimization and microstructure analysis of multilayer coatings with laser powder-fed additive manufacturing

Yue

Guo

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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To clarify the parameters interaction effects and improve the forming quality of Fe-Cr alloy multilayer laser powder-fed additive manufacturing (LPF-AM) on AISI 4340 substrate, experimental research for Fe-Cr alloy multilayer LPF-AM was carried out via the response surface method (RSM). The interaction effects and evolution rules of laser energy density ( E), powder feed rate ( Q), and Z-axis increment ( h) on minimum cladding height, deposition efficiency and surface spheroidization defects were discussed. The multiobjective particle filter resampling particle swarm optimization (MORPSO) algorithm was adopted to optimize the processing parameters. The phase transformation, grain growth, and microhardness of multilayer LPF-AM were analyzed. The results showed that the powder feed rate and Z-axis increment were found to affect the minimum cladding height and deposition efficiency, respectively. Laser energy density played an essential role in spheroidization defects. The forming quality was significantly improved based on the optimal process parameters of E = 33 J/mm2, Q = 0.5 g/s, and h = 0.8 mm. The primary and secondary remelting zones are fine equiaxed dendrites and irregular cellular structures, respectively, and the microstructure of the cladding tracks and layers showed a good metallurgical bonding. The microhardness of the cladding layer ranged from 321 ± 18 to 625 ± 24 HV0.5, and the average microhardness is twice that of the AISI 4340 substrate.

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Examination of the sliding wear of bronze coatings on railway buffer heads

Cited by 9 publications

References 17 publications

Damage and Fatigue Life Evaluation for Laser Cladding Remanufactured Wheel

Damage and Fatigue Life Evaluation for Laser Cladding Remanufactured Wheel

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

Forming quality optimization and microstructure analysis of multilayer coatings with laser powder-fed additive manufacturing

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