Design of wear and corrosion resistant FeNi-graphite composites by laser cladding

Raghuram, Harsha; Katsich, Christian; Pichelbauer, K.; Koschatzky, K.; Gachot, Carsten; Cihak-Bayr, Ulrike

doi:10.1016/j.surfcoat.2019.124897

Cited by 24 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the laser-cladding tests were performed on both specimens, the elements between the heated substrate and the cladding layer underwent a permeation phenomenon or exchanged with each other. This may lead to the fact that the elements will combine and thus the content of the elements will change [18].…”

Section: Physical Phase Analysis Of the Coatingmentioning

confidence: 99%

Investigation on Sliding Tribological Properties of Laser Cladding Alloy Coating for Subway Wheels

2022

View full text Add to dashboard Cite

The wheel pair is a key component of the subway. Routes of subway conditions are more complex, while frequent starting and braking are more likely to cause wheel damage. To improve the sliding tribological properties of subway wheels, this article focused on laser-cladding technology to repair the wheel. Ni-based and Fe-based alloy coatings were prepared. The microstructure of the coatings was studied by SEM, EDS, XRD, and 3D optical morphology. The mechanical properties of the coating were studied by the Vickers microhardness tester and MFT-EC4000 reciprocating electrochemical friction and wear tester. There are mainly γ(Ni, Fe), Cr7C3, Cr23C6, and other phases in the Ni-based coating, and there are mainly γ-Fe, (Fe, Ni), (Fe-Cr-Ni) solid solution and other phases in the Fe-based coating. The hardness of the Ni-based coating is 250 HV0.7, which is essentially the same as the hardness of the substrate. The hardness of the Fe-based coating reaches a maximum of 715HV0.7. The hardness of the Fe-based coating is 2.86 times higher than the hardness of the substrate. The Fe-based coating is strengthened by the solid solution due to the existence of the solid-solution phase. The Ni-based coating in high-temperature performance is general. Its hardness and friction performance were also ordinary. The results of the study can provide theoretical and technical guidance for the application of laser-cladding technology on subway wheels.

show abstract

Section: Physical Phase Analysis Of the Coatingmentioning

confidence: 99%

Investigation on Sliding Tribological Properties of Laser Cladding Alloy Coating for Subway Wheels

2022

View full text Add to dashboard Cite

show abstract

“…The hardness of the FeNi-graphite composite layer decreased when the softer graphite content was increased. However, the composite layer exhibited better wear resistance at an optimum graphite content [25].…”

Section: Introductionmentioning

confidence: 96%

“…A higher graphite content tends to reduce the hardness of the composite coating, which in turn increases the possibility of Al2O3 pull-out. However, an inverse correlation of the wear to the hardness of the composite layer has been observed in the FeNigraphite composite layer [25]. The hardness of the FeNi-graphite composite layer decreased when the softer graphite content was increased.…”

Section: Introductionmentioning

confidence: 98%

Tribological characteristics of friction stir processed graphite and tin/LM24 surface composites

2020

View full text Add to dashboard Cite

Friction stir processing (FSP) is an emerging solid-state technique for preparing surface composites using various reinforcements. Ceramics and metallic particles are easily reinforced in a matrix by this technique. Surface composites made from an LM24 alloy reinforced with graphite and tin, with good wettability and material flow owing to the low melting point of tin, were fabricated by FSP at two rotational speeds of 1,400 and 1,000 rpm. Despite its low hardness, the graphite/LM24 surface composite fabricated at a higher rotational speed of 1,400 rpm exhibited better wear resistance. However, its frictional behavior was not significantly affected by the reinforcement. The fabricated surface composites with graphite and tin reinforcement as well as graphite-only reinforcement exhibited contradicting behaviors under sliding wear conditions. The post wear analysis indicated that abrasion, adhesion, layer formation, and delamination occurred on the composite surfaces.

show abstract

“…The cladding coating has the advantages of low dilution ratio and good bond condition, which can significantly improve the anti-corrosion and wear resistance of the substrate surface. [1,2] However, due to the rapid heating and cooling phenomenon of the molten pool during laser cladding, and the difference in thermal expansion properties between the coating and the substrate, the cladding coating has obvious local plastic deformation and residual stress, which will easily lead to cracks and affect the fatigue life of the mechanical parts. [3][4][5][6] Therefore, it is crucial to study the thermal-stress evolution, residual stress, and deformation of laser cladding coating.…”

Section: Introductionmentioning

confidence: 99%

Numerical research on effect of overlap ratio on thermal-stress behaviors of the high-speed laser cladding coating*

2021

View full text Add to dashboard Cite

High-speed laser cladding technology, a kind of surface technology to improve the wear-resistance and corrosion-resistance of mechanical parts, has the characterizations of fast scan speed, high powder utilization rate, and high cladding efficiency. However, its thermal-stress evolution process is very complex, which has a great influence on the residual stress and deformation. In the paper, the numerical models for the high-speed laser cladding coatings with overlap ratios of 10%, 30%, and 50% are developed to investigate the influence rules of overlap ratio on the thermal-stress evolution, as well as the residual stresses and deformations. Results show that the heat accumulation can reheat and preheat the adjacent track coating and substrate, resulting in stress release of the previous track coating and decreased longitudinal stress peak of the next track coating. With the overlap ratio increasing, the heat accumulation and the corresponding maximum residual stress position tend to locate in the center of the cladding coating, where the coating has a high crack susceptibility. For a small overlap ratio of 10%, there are abrupt stress changes from tensile stress to compressive stress at the lap joint, due to insufficient input energy in the position. Increasing the overlap ratio can alleviate the abrupt stress change and reduce the residual deformation but increase the average residual stress and enlarge the hardening depth. This study reveals the mechanism of thermal-stress evolution, and provides a theoretical basis for improving the coating quality.

show abstract

Design of wear and corrosion resistant FeNi-graphite composites by laser cladding

Cited by 24 publications

References 22 publications

Investigation on Sliding Tribological Properties of Laser Cladding Alloy Coating for Subway Wheels

Investigation on Sliding Tribological Properties of Laser Cladding Alloy Coating for Subway Wheels

Tribological characteristics of friction stir processed graphite and tin/LM24 surface composites

Numerical research on effect of overlap ratio on thermal-stress behaviors of the high-speed laser cladding coating*

Contact Info

Product

Resources

About