Effects of cubic carbides and La additions on WC grain morphology, hardness and toughness of WC–Co alloys

Zhang, Li; Chen, Shu; Cheng, Xingwang; Wu, Houping; Ma, Yanning; Xiong, Xiang-jun

doi:10.1016/s1003-6326(11)61373-3

Cited by 17 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen from Figure 10a for sample A1, without any addition, the WC grains present a truncated multangular prism feature with more than eight crystal planes, which indicates that WC morphology is close to the equilibrium shape [31,32]. This result is consistent with the report of Zhang et al [33]. When adding 0.8 wt.…”

Section: Effect Of Vc Cr 3 C 2 Tac On Wc Morphologysupporting

confidence: 90%

Effects of Cr3C2, VC, and TaC on Microstructure, WC Morphology and Mechanical Properties of Ultrafine WC–10 wt. % Co Cemented Carbides

Yin

Ruan

et al. 2020

Metals

View full text Add to dashboard Cite

In this study, the effects of Cr3C2, VC, and TaC on microstructure, WC grain morphology and mechanical properties of WC–10 wt. % Co ultrafine cemented carbides were investigated. The experimental results showed that WC grains size decreased and size distribution became narrow by adding Cr3C2, VC, and TaC. The inhibition efficiency was in the order of VC > Cr3C2 > TaC. Cr3C2 addition would induce triangular prism grains and Co phase was strengthened by Cr3C2, resulting in the enhancement of transverse rupture strength (TRS) and impact toughness. WC morphologies in cemented carbides with VC addition were triangular prisms with multi-steps in basal and prismatic planes due to anisotropic growth. The multi-steps in basal and prismatic planes led to low TRS and fracture toughness. The inhibition mechanism of TaC is to reduce the surface energy of WC and slow down the solution/re-precipitation rate at the WC/Co interfaces by adsorbing on the surface of WC grains. The sample with 0.8 wt. % Cr3C2 had excellent comprehensive mechanical properties. Its Vickers hardness, fracture toughness, TRS and impact toughness were 1620 kg/mm2, 9.94 MPa·m1/2, 3960 MPa and 50.4 J/m2, respectively. In summary, Cr3C2 is the first choice as the grain growth inhibitors (GGI) for the preparation of ultrafine cemented carbides.

show abstract

Section: Effect Of Vc Cr 3 C 2 Tac On Wc Morphologysupporting

confidence: 90%

Effects of Cr3C2, VC, and TaC on Microstructure, WC Morphology and Mechanical Properties of Ultrafine WC–10 wt. % Co Cemented Carbides

Yin

Ruan

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…The optimal hardness values of TiB 2 , ZrB 2 , and HfB 2 are 25.0, 17.5, and 21.5 GPa, respectively. All of these samples are harder than general hydrophobic materials, even harder than hard materials Al 2 O 3 and WC. , Moreover, TiB 2 , ZrB 2 , and HfB 2 are conductors having optimal electrical resistance values of 1.21 × 10 –7 , 4.87 × 10 –8 , and 1.04 × 10 –7 Ω·m, respectively (Figure e,f). And higher hardness will bring lower electrical resistance; the reason is that hardness and electrical resistance are associated with density.…”

Section: Resultsmentioning

confidence: 99%

“…31,32 Moreover, TiB 2 , ZrB 2 , and HfB 2 are conductors having optimal electrical resistance values of 1.21 × 10 −7 , 4.87 × 10 −8 , and 1.04 × 10 −7 Ω•m, respectively (Figure2e,f). And higher hardness will bring lower electrical resistance; the reason is that hardness and electrical resistance are associated with density.…”

mentioning

confidence: 99%

Robust Hydrophobic Materials by Surface Modification in Transition-Metal Diborides

Gan

Liu

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Exploring the hydrophobicity of robust conductors is significant for electronic devices to simultaneously be used in a wet environment and extreme conditions. However, a combination of conductivity, strong mechanical properties, and hydrophobicity in one material is hindered by the inherent features of the materials. A new kind of robust hydrophobic conductor is designed in transition-metal diborides (TMdBs: TiB 2 , ZrB 2 , and HfB 2 ) to break through this challenge. The results calculated by density functional theory indicate that high hardness comes from high shear and bulk modulus, which is consistent with experimental results (TiB 2 , 25.0 GPa; ZrB 2 , 17.5 GPa; HfB 2 , 21.5 GPa). The theoretical calculated results reveal that edge sides have a lower surface energy than basal plane (001) in TMdBs. Hence, the edge sides are exposed with a needle-like morphology in TMdBs. Moreover, needle-like surfaces exhibiting hydrophobicity have water contact angles of 132.0°(TiB 2 ), 116.8°(ZrB 2 ), and 114.0°(HfB 2 ). The hydrophobicity arises from a lower surface free energy of edge sides in TMdBs and a rough surface that reduces the contact area of water and a solid. This work develops a new kind of robust functional material in TMdBs.

show abstract

“…The irradiated surface consists of region with contact melting of carbide particles, region of the melt Co phase. The crystal structure of WC is simple hexagonal and distributed in the Co matrix [18]. Due to the low melting point Co, coupled with the existence of the marginal effect, so that the craters distributed in the edge of WC grains mainly.…”

Section: Morphology and Roughnessmentioning

confidence: 99%

Surface modification of YW2 cemented carbide cutting tool by high current pulsed electron beam

Lou¹,

Zhang²,

Lyu³

et al. 2015

View full text Add to dashboard Cite

Surface modification of YW2 cemented carbide cutting tool was carried out through high current pulsed electron beam (HCPEB) with different pulsed times, and the microstructure, mechanical properties and cutting performance is also investigated in this work. The evolution of phase composition and morphology of tool was tested by means of XRD and SEM, and the microhardness was measured. The results showed that the content of metastable phase Co3W3C is increased in tool surface after beam irradiation. The metastable phase and residual compressive stress induced by HCPEB treatment modified the microhardness of YW2 turning insert dramatically. The cutting performance of YW2 turning insert with 40 times irradiation was examined and compared with original one by machining Ti-6Al-4V alloy bar. It is found that the irradiated YW2 tool increased cutting speed than that of un-irradiated one along with serious wear.

show abstract

Effects of cubic carbides and La additions on WC grain morphology, hardness and toughness of WC–Co alloys

Cited by 17 publications

References 17 publications

Effects of Cr3C2, VC, and TaC on Microstructure, WC Morphology and Mechanical Properties of Ultrafine WC–10 wt. % Co Cemented Carbides

Effects of Cr3C2, VC, and TaC on Microstructure, WC Morphology and Mechanical Properties of Ultrafine WC–10 wt. % Co Cemented Carbides

Robust Hydrophobic Materials by Surface Modification in Transition-Metal Diborides

Surface modification of YW2 cemented carbide cutting tool by high current pulsed electron beam

Contact Info

Product

Resources

About