Influence of Sn and Nb additions on the microstructure and wear characteristics of a gray cast iron

Li, Qiang‐Guo; Zhang, Yanan; Zhang, Yaning; Li, Haibo; Ren, Huihui; Zhong, Yamei; Huang, Xuefei; Huang, Weigang

doi:10.1007/s00339-020-03468-8

Cited by 23 publications

(12 citation statements)

References 24 publications

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“…In general, materials with higher hardness possess excellent wear resistance, and the friction coefficient relates to the hardness [22]. Due to its high content of graphite, gray cast iron showed superior tribological behavior [1], resulting in a relatively low friction coefficient under dry sliding conditions. Therefore, there is a limitation on the friction coefficient reduction by laser cladded Fe-based coating.…”

Section: Tribological Performance Under Dry Slidingmentioning

confidence: 99%

“…Severe wear with several craters and a coarse surface can be observed. Because gray cast iron contains large graphite, graphite flakes can be easily peeled off due to their low strength, resulting in craters [1]. Additionally, a scattered oxidation film with a high oxygen content adhered to the surface of gray cast iron, revealing that oxide reactions occur during the friction process.…”

Section: Tribological Performance Under Starved Lubricationmentioning

confidence: 99%

“…Due to its merits, such as good thermal conductivity, mechanical properties and excellent tribological behavior [1], gray cast iron is widely used for manufacturing hydraulic/pneumatic equipment, machine tools, general industrial machines, and transportation equipment [2]. However, the low hardness and brittle fracture feature can seriously threaten their regular operation [3].…”

Section: Introductionmentioning

confidence: 99%

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Combined Effect of a Laser Cladded Coating and Surface Texture on Tribological Performance Under Dry Sliding and Starved Lubrication

Qiao

Zhang

et al. 2022

Met. Mater. Int.

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Fe-based alloy coating was laser cladded on gray cast iron using Ni-Cu alloy as an intermediate layer. The cross section of the laser cladded coating was characterized by optical microscopy (OM), scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS), X-ray diffraction (XRD), and a Vickers hardness tester. A microdimple texture was created by reciprocating an electrolyte jet with prefabricated mask (REJP) machining on an Fe-based alloy coating. The tribological performances of untextured and textured coatings were examined through interrupted wear tests using an in-house developed reciprocating ball-on-plate tribotester under dry sliding and starved lubricated conditions. The results show that the presence of microdimple edges in the nonconformal contact region has a detrimental effect on the friction performance under dry sliding. However, the microdimples can be beneficial for trapping debris to preserve a smoother contacting surface and thus a lower volume wear track compared to untextured coatings. Due to its role in oil reservoirs and debris entrapment, the microdimple textured coating can maintain a low friction coefficient for a long time period after lubricant oil cutoff and results in a lower volume wear track under starved lubrication. Graphical abstract

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Section: Tribological Performance Under Dry Slidingmentioning

confidence: 99%

Section: Tribological Performance Under Starved Lubricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined Effect of a Laser Cladded Coating and Surface Texture on Tribological Performance Under Dry Sliding and Starved Lubrication

Qiao

Zhang

et al. 2022

Met. Mater. Int.

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“…Because the graphite flakes and the matrix around the graphite flakes can be easily peeled off, rough wear surface and some craters are generated, which, in turn, lead to the violent fluctuation of friction coefficient and a high mass loss. The main wear mechanism of the substrate is the predominant fatigue wear [24]. The morphology of worn surface of coating is shown in Figure 16a-c.…”

Section: Friction and Wear Propertiesmentioning

confidence: 99%

Microstructure and Properties of Fe-Based Alloy Coating on Gray Cast Iron Fabricated Using Induction Cladding

Liu²,

Song

et al. 2020

Coatings

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Gray cast iron is widely used for the cylinder bore of marine diesel engine. With the aim to improve the properties of the cylinder liner and maintain the matching ability with piston ring under the harsh working condition, the Fe-based alloy coating is fabricated on the gray cast iron using induction cladding. Owing to the high carbon content in both coating and substrate materials, it is extremely difficult to control the coating process and the coating quality. The additive of welding flux and prolonged heating time is proposed to prepare good quality coating. The coating forming mechanism is investigated, and the electrochemical corrosion and tribological properties of the coating are examined. The results show that the Fe-based coating possess better corrosive and tribological performance than gray cast iron, and it is seemed to be a potential candidate for improving the performance of the cylinder liner.

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“…Niobium can refine graphite flakes and decrease the interlamellar spacing of pearlite, thereby effectively improving the tensile strength, fatigue properties and impact toughness of grey cast iron [ 8 , 9 , 10 ]. The present research found that the addition of niobium will cause NbC to precipitate, strengthen the structure and improve the mechanical properties of grey cast iron since the affinity of niobium with carbon is much greater than that of iron with carbon [ 11 , 12 , 13 ]. Zhou [ 14 ] researched and analyzed the effect of niobium elements on grey cast iron.…”

Section: Introductionmentioning

confidence: 99%

The Precipitation of Niobium Carbide and Its Influence on the Structure of HT250 for Automobile Wheel Hubs

et al. 2021

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Improving the strength of grey cast iron wheel hubs will improve the safety of automobiles and have a great significance for energy saving and environmental protection. This paper systematically compares the calculation results of Python-based precipitation calculation and JmatPro software simulation with experiments. The results show that with a low mass fraction of niobium (0.098%) cuboid Niobium Carbide (NbC) precipitates do not form in the liquid phase; however, an elongated NbC niobium-rich phase may form during the solidification process and in the solid phase. However, cuboid NbC precipitates can be precipitated from the liquid phase when the niobium mass fraction is higher (0.27%, 0.46%). These results indicate that with the increasing niobium content the amount, particle size, and initial precipitation temperature of niobium carbide precipitated in the matrix structure will increase. According to the observation and statistical analysis of the microstructure, it is found that tensile strength will be improved with an increase in niobium content due to the refinement of the graphite and pearlite interlamellar spacing. In this paper, adding less than 0.32% of Nb to grey cast iron is recommended, considering the comprehensive cost and the effect of niobium in the material structure.

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Influence of Sn and Nb additions on the microstructure and wear characteristics of a gray cast iron

Cited by 23 publications

References 24 publications

Combined Effect of a Laser Cladded Coating and Surface Texture on Tribological Performance Under Dry Sliding and Starved Lubrication

Combined Effect of a Laser Cladded Coating and Surface Texture on Tribological Performance Under Dry Sliding and Starved Lubrication

Microstructure and Properties of Fe-Based Alloy Coating on Gray Cast Iron Fabricated Using Induction Cladding

The Precipitation of Niobium Carbide and Its Influence on the Structure of HT250 for Automobile Wheel Hubs

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