Simultaneously enhanced hardness and toughness of normalized graphite ductile irons by TiC-TiB2 nanoparticles

Wang, Bingxu; Qiu, Feng; Hu, Ming; Cui, Weiwei; Hu, Zirui; Barber, Gary C.

doi:10.1016/j.matlet.2021.129597

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…2f. Some studies found that TiC particles distributed at the austenite grain boundaries hindered the diffusion of carbon atom to graphite during the solidi cation process, causing graphite to grow unevenly in austenite shell, aggravating the distortion of graphite and eventually resulting in a decrease in the spheroidization rate [22].…”

Section: Microstructures Of Ductile Iron With Different Contents Of Ticmentioning

confidence: 99%

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Williams²,

Qu³

et al. 2023

Tribol Lett

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In order to improve the wear resistance of ductile iron, different contents of TiC particles are added into ductile iron used lost foam casting and the tribological behavior of ductile iron is studied through a ballon-disk sliding test. It is found that with the increase of TiC content, the pearlite content gradually increases, which is attributed to TiC accelerating the diffusion of carbon atoms to cementite and promoting the heterogeneous nucleation of cementite. The increase of pearlite content and the second phase strengthening caused by TiC improve the hardness and tensile strength of ductile iron. Ductile iron has the best tensile strength (498 MPa) and hardness (168 HV1) with a TiC content of 1 wt.%. The wear resistance also increases with increasing TiC content. The wear volume is reduced from 0.14 mm 3 to 0.03 mm 3 , and the main wear mechanism changes from adhesive wear to abrasive wear. The oxide layer produced by frictional heat on the worn surface and the hardened layer produced by strain hardening on the subsurface further improve the wear resistance. Therefore, the wear resistance of ductile iron is affected by the changes of microstructure before and after wear.

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Section: Microstructures Of Ductile Iron With Different Contents Of Ticmentioning

confidence: 99%

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Williams²,

Qu³

et al. 2023

Tribol Lett

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“…Therefore, it is necessary to research the manufacture of permanent molds with FCD because it has hard dan tough properties, has a higher melting point than gray cast iron, and will be easy to machine to produce good products/molds and more precision to reduce the finishing process [18][19][20]. Hardness and toughness are important properties of metals [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nodular Graphite on Hardness and Toughness in Permanent Molds Made of Ferro Casting Ductile

Yulianto,

Darmawan,

Anggono

et al. 2024

J. Phys.: Conf. Ser.

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The permanent mold was made of Ferro Casting Ductile as a result of sand casting. Permanent mold is mold that can be used repeatedly. This permanent mold is used to produce tensile test specimens. Tensile test specimens are made of gray cast iron. This study aims to determine and analyze the effect of spheroidal graphite on the hardness and toughness of Ferro Casting Ductile in permanent molds to make tensile test specimens. The casting process starts by making patterns using Styrofoam, making molds with green-sand sand molds, followed by pouring molten cast iron into the molds. The next process is dismantling the castings and machining to get a permanent mold according to the dimensions. Specimens for testing the chemical composition were obtained from the results of castings into spherical dies. Meanwhile, the impact, hardness, and microstructure specimens were taken from the permanent molded product. The results of the chemical composition test showed that Ferro Casting Ductile contained several main elements, namely 92.14 %Fe, 3.681 %C, 3.715 %Si, 0.182 %Mn, 0.050 %Ni, and 0.034 %Mg which affected the percentage of nodular graphite. Nodular graphite will affect the hardness of the permanent mold. Validation was carried out by testing the hardness at 3 different points 167.70 VHN, 162.77 VHN, and 155.77 VHN. Toughness was obtained from the impact test using the Charpy method, the impact values were 0.048 Joule/mm2 0.046 Joule/mm2 0.037 Joule/mm2 on 3 different specimens. From the test results, the specimen has met the FCD 400 standard.

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“…High temperature structural ceramics are mainly composed of borides (ZrB 2 (Zirconium diboride), HfB 2 (Hafnium diboride), TaB 2 (Tantalum diboride)), carbides (HfC (Hafnium carbide), TaC (Tantalum carbide), ZrC (Zirconium carbide), NbC (Niobium carbide)) and nitride (HfN (Hafnium nitride), NbN (Niobium nitride), and ZrN (Zirconium nitride)) [4], as shown in Figure 1. According to the research and development of ultra-high temperature ceramics in recent years, scholars have done a lot of research on single boride ceramic and its composite materials, including preparation methods, oxidation resistance, and mechanical and thermophysical properties, and made breakthrough progress [5]. However, the research on carbide ceramic composites is relatively little.…”

Section: Introductionmentioning

confidence: 99%

“…Coatings 2021, 11, x FOR PEER REVIEW 2 of 20 sistance, and mechanical and thermophysical properties, and made breakthrough progress [5]. However, the research on carbide ceramic composites is relatively little.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

et al. 2021

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TiC ceramics have become one of the most potential ultra-high temperature structural materials, because of its high melting point, low density, and low price. However, the poor mechanical properties seriously limit its development and application. In this work, this review follows PRISMA standards, the mechanism of the second phase (particles, whiskers, and carbon nanotubes) reinforced TiC ceramics was reviewed. In addition, the effects of the second phase on the microstructure, phase composition and mechanical properties of TiC ceramics were systematically studied. The addition of carbon black effectively eliminates the residual TiO2 in the matrix, and the bending strength of the matrix is effectively improved by the strengthening bond formed between TiC; SiC particles effectively inhibit the grain growth through pinning, the obvious crack deflection phenomenon is found in the micrograph; The smaller grain size of WC plays a dispersion strengthening role in the matrix and makes the matrix uniformly refined, and the addition of WC forms (Ti, W) C solid solution, WC has a solid solution strengthening effect on the matrix; SiC whiskers effectively improve the fracture toughness of the matrix through bridging and pulling out, the microscopic diagram and mechanism diagram of SiC whisker action process are shown in this paper. The effect of new material carbon nanotubes on the matrix is also discussed; the bridging effect of CNTs can effectively improve the strength of the matrix, during sintering, some CNTs were partially expanded into GNR, in the process of crack bridging and propagation, more fracture energy is consumed by flake GNR. Finally, the existing problems of TiC-based composites are pointed out, and the future development direction is prospected.

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Simultaneously enhanced hardness and toughness of normalized graphite ductile irons by TiC-TiB2 nanoparticles

Cited by 7 publications

References 16 publications

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

The Effect of Nodular Graphite on Hardness and Toughness in Permanent Molds Made of Ferro Casting Ductile

Microstructure and Mechanical Properties of Carbide Reinforced TiC-Based Ultra-High Temperature Ceramics: A Review

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