Effect of carbide additions on grain growth in TiC−Ni cermets

Shin, Soon-Gi; Lee, Junhee

doi:10.1007/bf03027524

Cited by 15 publications

(9 citation statements)

References 24 publications

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“…Consequently, it can be concluded that the surface energy anisotropy of Ti‐based carbonitride ceramic grains in Ti(C,N)‐based cermets, that is, the solid/liquid interface energy anisotropy, varied with cermet composition, thus leading to the 3D thermodynamic equilibrium shape evolution of Ti(C,N)‐based carbonitride ceramic grains. This was in good agreement with the variation in the thermodynamic equilibrium shape of Ti‐based carbide ceramic grains with composition of TiC‐based cermets …”

Section: Discussionsupporting

confidence: 84%

“…This was in good agreement with the variation in the thermodynamic equilibrium shape of Ti-based carbide ceramic grains with composition of TiC-based cermets. 39 The outer rim of large Ti-based carbonitride ceramic grains in cermets A and B increased in thickness with the increase of holding time, and on the other hand, Ti-based carbonitride ceramic grains with more than one core were relatively few in number, even after sintering for 10 h (Fig. 4).…”

Section: Discussionmentioning

confidence: 97%

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Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

et al. 2014

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Growth behavior of Ti‐based carbonitride ceramic grains in two high‐Mo Ti(C,N)‐based cermets with Ni and Ni–20Cr (wt%) binders was investigated during liquid‐phase sintering under vacuum at 1410°C, using DSC, XRD, SEM, AEM, and EDS. Grain growth occurred primarily through two‐dimensional nucleation and lateral growth. Most significantly, the grain growth kinetics followed the cubic law, which was controlled by the diffusion of dissolved mass through liquid Ni‐based binder phase. However, when Ni–20Cr (wt%) was used as metallic binder, the inner rim of ceramic grains with the typical core‐rim structure was seldom complete, and there were often some fine Ni‐rich and Mo‐rich speckles in their core. In Ni‐rich and Mo‐rich speckles, there were two kinds of microstructure: one consisted of Ni‐based superlattice phase, and the other consisted of Ti‐based carbonitride ceramic phase and unknown phases. The three‐dimensional thermodynamic equilibrium shape of Ti‐based carbonitride ceramic grains evolved from a {111}‐faceted and round ‐edged octahedron to a {111}‐faceted and sharp‐edged octahedron. In addition, the grain growth rate increased, which was mainly attributed to that the decrease of solid/liquid transformation temperature of Ni‐based binder phase led to the increase of the diffusion rate of dissolved mass through liquid Ni‐based binder phase.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 97%

Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

et al. 2014

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“…[ 3–6 ] Some transitional metal carbides, such as Mo 2 C [ 7–9 ] and WC, [ 10–13 ] are effective additives for improving the wettability between the ceramic phase and binder, thinning the ceramic phase, and modifying the mechanical properties of the cermets. [ 14,15 ] In addition, carbides, such as TaC, [ 16,17 ] NbC, [ 18 ] and ZrC, [ 19 ] are also used to modify the mechanical properties of TiC‐based cermets.…”

Section: Introductionmentioning

confidence: 99%

TiC–High Mn Steel‐Bonded Cermets with Improved Strength and Impact Toughness

Zhou

et al. 2020

steel research int.

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TiC–high Mn steel‐bonded cermets are prepared by powder metallurgy techniques. The effects of (Ti0.5W0.5)C or WC on the microstructure, hardness, transverse rupture strength (TRS), and impact toughness (IM) are investigated. The results show that regardless of the additives used, the hardness and TRS of cermets increase with the increase in W content. However, IM is not directly proportional to the W content. Peak IM value is obtained at 5% WC addition. The highest IM of 15.12 J cm−2 is measured from the cermet with (Ti0.5W0.5)C additive with a hardness and TRS of 64.8 HRC and 2510 MPa, respectively. Liquid phase sintering occurs at vacuum sintering. Black core–gray outer rim structure is formed in cermets with WC additives and white inner rims appear in cermets with higher W content. White core–gray rim structure is formed in cermets with (Ti0.5W0.5)C additives. The impact fracture mode of the cermets is the intergranular fracture accompanied by the tearing edges of the binder. The tearing of the high Mn steel binder is the main source of IM. IM peaks are attributed to the contradictory effects of decreased fraction and refined binder microstructure.

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“…Hence, it is crucial to improve the wettability between the binders on the ceramic phase in order to increase the phase interface bonding strength of the cermets. Studies have confirmed that Mo [10][11][12][13][14], Mo2C [14][15][16][17][18][19], WC [15,18,[20][21][22][23], TaC [15,17,19], NbC [19], and ZrC [24] can improve the wettability of the metallic binderin the ceramic phase, refine the ceramic phase, and modify the mechanical properties of cermets. Moreover, a previously published result from the author has also shown that using Fe-Mo-Cr pre-alloyed powder as a binder significantly improved the transverse rupture strength and impact toughness of TiChigh Mn steel-bonded carbide [4].…”

Section: Introductionmentioning

confidence: 99%

The Preparation Process, Microstructure and Properties of Cellular TiC–high Mn Steel-bonded Carbide

Zhou

Yang

et al. 2020

Preprint

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TiC–high Mn steel-bonded carbide with a cellular structure was designed and fabricated by powder metallurgy techniques using coarse and fine TiC particles as the hard phase. This preparation process was carefully investigated and optimized. The microstructure of the TiC steel-bonded carbide was observed using a scanning electron microscope. Results showed that there are two types of microstructures in the TiC steel-bonded carbide: the coarse-grained TiC and fine-grained TiC. The transverse rupture strength and impact toughness of the alloy reach maximum values 2231 MPa and 12.87 J/cm2, respectively when the starting weight ratio of MP-A (containing coarse TiC particles) to MP-B (containing fine TiC particles) is 60:40. Hence, this study serves as a feasible example of how to prepare a high-strength and high-toughness TiC–high Mn steel-bonded carbide.

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Effect of carbide additions on grain growth in TiC−Ni cermets

Cited by 15 publications

References 24 publications

Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

TiC–High Mn Steel‐Bonded Cermets with Improved Strength and Impact Toughness

The Preparation Process, Microstructure and Properties of Cellular TiC–high Mn Steel-bonded Carbide

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Effect of carbide additions on grain growth in TiC−Ni cermets

Cited by 15 publications

References 24 publications

Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

Grain Growth in Ti(C,N)‐Based Cermets During Liquid‐Phase Sintering

TiC–High Mn Steel‐Bonded Cermets with Improved Strength and Impact Toughness

The Preparation Process, Microstructure and Properties of Cellular TiC&ndash;high Mn Steel-bonded Carbide

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The Preparation Process, Microstructure and Properties of Cellular TiC–high Mn Steel-bonded Carbide