The grain growth and boundary evolution of extra-coarse-grained cemented carbides by pressureless sintering of ball-milling-mixed WC with Co at different temperature

Yu, Songbai; Min, Fanlu; Ying, Guobing; Noudem, Jacques; Liu, Sijin; Zhang, Jianfeng

doi:10.1016/j.matchar.2021.111386

Cited by 21 publications

(5 citation statements)

References 46 publications

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“…According to the above current results, it is determined that the comprehensive mechanical properties (Vickers hardness, flexural fracture strength, and fracture toughness) of the WM composite are more excellent under the sintering temperature of 1200 °C. Comparing with the reported reinforcements/WC composites, [7,[11][12][13]23,35,[39][40][41][42][43][44][45][46] the WM composites (1200 °C) reported here exhibit outstanding mechanical properties with relatively low sintering temperature and low content of reinforcements, as shown in Figure 7a,b, respectively. From Figure 7a, it shows that the WM composite has both higher hardness and toughness at lower sintering temperatures than other binderless WC composites.…”

Section: Mechanical Propertiessupporting

confidence: 57%

“…Hybrid fracture modes may be caused by local residual stresses caused by thermal expansion coefficient mismatches. [ 46 ] Due to the residual stress as shown in Equation (), the cracks were pinned at grain boundaries and defect entered grains, resulting in transgranular fracture. More external force is required to promote crack propagation during fracture.…”

Section: Resultsmentioning

confidence: 99%

“…Yu et al also found the same phenomenon in WC–Co composites. [ 46 ] For WM composites sintered at low temperature, the crack growth may be accelerated by the WC grains with more defective surfaces, forming microcracks and transgranular fracture. The WC/WC boundaries are less resistant to cracking than WC/MgO, led to transgranular fracture mode.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of High‐Performance WC–MgO Composites by Spark Plasma Sintering

et al. 2022

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Herein, tungsten carbide (WC)–4.3 wt% MgO composite powders are synthesized by high‐energy planetary ball milling method and then consolidated by spark plasma sintering (SPS). Submicrometer WC–MgO composite powders are consolidated to obtain a nearly complete density of WC–MgO composites (99.15%). The nanosized MgO distributed along the WC grains in WC–MgO composite plays an important role of dispersion strengthening and achieving high flexural fracture strength of WC–MgO composites (1348 MPa). As the addition of MgO increases the interfacial strength, the fracture mode of WC–MgO composites is mainly a mixture of transgranular fracture and intergranular fracture. High value on Vickers hardness (1660HV) and fracture toughness (9.37 MPa m1/2) of WC–MgO are also observed due to the crack deflection and crack bridging. Binderless WC–MgO composites have similar properties to WC–Co and are expected to replace WC–Co hard metal for saving resources and reducing cost.

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Section: Mechanical Propertiessupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Preparation of High‐Performance WC–MgO Composites by Spark Plasma Sintering

et al. 2022

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“…The appearance of the η phase or the graphite phase will worsen the properties of cemented carbides and reduce their comprehensive properties, in which sintering the temperature plays a key role [36,37]. The sintering temperature has an important effect on the size and distribution of the WC grain, the porosity of the alloy structure, and the physical-mechanical properties [38][39][40]. Given this, this article proposes a method for preparing WC-10Co-0.5Cr 3 C 2 -1TaC-0.5Ru cemented carbides based on a combination of rolling ball milling and low-pressure sintering.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Fine-Grained WC-10Co-0.5Cr3C2-1TaC-0.5Ru Prepared by Rolling Ball Milling and Low-Pressure Sintering

Huang,

Xiong,

Qin

et al. 2023

Metals

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This study focuses on the preparation of fine-grained WC/Co composite powder using rolling ball milling and spray drying techniques. The cemented carbide composition achieved through low-pressure sintering technology was WC-10Co-0.5Cr3C2-1TaC-0.5Ru (wt.%). To study the effect of sintering temperature on the microstructure and mechanical properties of WC-10 wt.% cemented carbide, the microstructure and phase constituents of the material were analyzed using X-ray diffractometry and scanning electron microscopy. Additionally, the physical and mechanical properties of the material were examined. The results indicate that as the sintering temperature increased from 1390 °C to 1450 °C, the grain size of WC in the alloy increased, resulting in a slight decrease in hardness, an increase in fracture toughness, and the transverse fracture strength increasing first and then decreasing. The sintered hard alloy prepared at 1410 °C exhibited fewer pores and a uniform and fine grain size, reaching a density of 99.98%, a hardness of 91.8 HRA, a fracture strength of 3962 MPa, and a fracture toughness of 14.7 MPa⋅m1/2

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“…The WC contiguity and mean free path of Co are two important parameters used to evaluate the microstructure of cemented carbides, which strongly influence the properties [22][23][24]. The trend chart of the mean free path of Co and contiguity of WC is presented in Figure 4.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

Zhang

Tong

et al. 2023

Materials Science and Technology

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In this study, ultrafine WC@10Co powders were used for the fabrication of coarse-grained WC-10Co with almost full densification. The incorporation of WC@10Co resulted in a decreasing size of WC grain with a rounded shape, the mean free path of Co and the WC contiguity. Further, substantial Co with face-centered cubic structure dispersed uniformly in the cemented carbides with WC@10Co-contained intergranular fracture accompanied by a large number of plastic deformation tears of the Co phase at the fracture surface and crack bridges at the crack tip. Therefore, the hardness, fracture toughness and bending strength of cemented carbides with WC@10Co reached the highest levels of 1045.3 kgf m−2, 23.6 MPa·m1/2 and 2308 MPa, respectively. HIGHLIGHTS The ultrafine WC@10Co contracted size distribution of WC grain with a rounded shape. The uniformly dispersed Co with a high content of FCC structure was obtained. The as-obtained coarse-grained cemented carbides showed enhanced mechanical properties

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The grain growth and boundary evolution of extra-coarse-grained cemented carbides by pressureless sintering of ball-milling-mixed WC with Co at different temperature

Cited by 21 publications

References 46 publications

Preparation of High‐Performance WC–MgO Composites by Spark Plasma Sintering

Preparation of High‐Performance WC–MgO Composites by Spark Plasma Sintering

Microstructure and Properties of Fine-Grained WC-10Co-0.5Cr3C2-1TaC-0.5Ru Prepared by Rolling Ball Milling and Low-Pressure Sintering

Enhancing the mechanical properties of coarse-grained cemented carbides by tailoring microstructure

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