Formation mechanism of cobalt-gradient structure in WC-Co hard alloy

Liu, Yong; Wang, Haibing; Yang, Jiangao; Huang, Baiyun; Long, Zhengyi

doi:10.1023/b:jmsc.0000033437.75050.5d

Cited by 36 publications

(11 citation statements)

References 1 publication

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“…[11][12][13][14] It has been reported that the heat treatment significantly improves the wear performance of WC/Co coatings, 11,15) and Stewart et al reported that the heat treatment may reduce the residual stress of the WC/Co coating.…”

Section: Resultsmentioning

confidence: 99%

WC/Co Coating on a Mild Steel Substrate through Underwater Shock Compaction Using a Self Combustible Material Layer (WC/Co Coating through Underwater Shock Compaction)

Lee

Hokamoto

2007

Mater. Trans.

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The explosive compaction technique has been applied to consolidate WC/Co powder to make a coating layer on a steel substrate, and the microstructure and some properties are investigated. Explosive compaction was performed using an improved method through underwater shock compression. Two types of assemblies, open and closed types were used for the experiments for generating relatively low and high pressure respectively. The effect of a thin nitrocellulose layer placed above the powders and the effect of the following heat treatment were investigated. In most of the experiments, the WC/Co layer was successfully recovered without cracks. The effects of applying higher underwater shock pressure, role of nitrocellulose as self combustible material and the following heat treatment showed positive effect to improve the properties by the increase of hardness as well as wear resistance of the coating layer.

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Section: Resultsmentioning

confidence: 99%

WC/Co Coating on a Mild Steel Substrate through Underwater Shock Compaction Using a Self Combustible Material Layer (WC/Co Coating through Underwater Shock Compaction)

Lee

Hokamoto

2007

Mater. Trans.

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“…(2) If there are two adjacent layers of WC-Co with various WC mean grain sizes in the green state, cobalt drifts from the layer with coarser microstructure into the layer with finer microstructure during liquid-phase sintering as a result of different capillary forces. These phenomena were described in detail in numerous publications with respect to bilayer cemented carbides pressed and sintered from various graded powders (Liu et al, 2004;Eso, Fang, & Griffo, 2005;Eso, Fang, & Fang, 2007).…”

Section: Functionally Graded Wc-co Cemented Carbidesmentioning

confidence: 97%

“…19/1-19/6;Fischer, Hartzell, & Akerman, 1988). Functionally graded cemented carbides similar to the Sadnvik DP60 grade were produced and examined in detail by Zhang, Wang, et al (2008), Zhang, Zhan, et al (2008), Liu, Wang, Yang, Huang, and Long (2004), and Liu et al (2006); the results of these publications are shown in Figure 7. The functionally graded cemented carbides are produced in a two-stage process comprising (1) fabrication of fully sintered carbide articles deficient with respect to carbon and therefore containing the h-phase and (2) carburization of the articles in a carburizing atmosphere at temperatures above 1300 C in the presence of liquid phase.…”

Section: Carbon Contentmentioning

confidence: 99%

Cemented Carbides for Mining, Construction and Wear Parts

Konyashin

2014

Comprehensive Hard Materials

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“…From Ref. [14], the microstructure of the presintered sample is mainly composed of WC, , and phase. phase is formed only when the total carbon content of the alloy is below the equilibrium level.…”

Section: Carburizing Pretreatment Of Substratementioning

confidence: 99%

Thermal residual stress analysis of diamond coating on graded cemented carbides

Huang

Cai

et al. 2008

J. Cent. South Univ. Technol.

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Finite element model was developed to analyze thermal residual stress distribution of diamond coating on graded and homogeneous substrates. Graded cemented carbides were formed by carburizing pretreatment to reduce the cobalt content in the surface layer and improve adhesion of diamond coating. The numerical calculation results show that the surface compressive stress of diamond coating is 950 MPa for graded substrate and 1 250 MPa for homogenous substrate, the thermal residual stress decreases by around 24% due to diamond coating. Carburizing pretreatment is good for diamond nucleation rate, and can increase the interface strength between diamond coating and substrate.

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Formation mechanism of cobalt-gradient structure in WC-Co hard alloy

Cited by 36 publications

References 1 publication

WC/Co Coating on a Mild Steel Substrate through Underwater Shock Compaction Using a Self Combustible Material Layer (WC/Co Coating through Underwater Shock Compaction)

WC/Co Coating on a Mild Steel Substrate through Underwater Shock Compaction Using a Self Combustible Material Layer (WC/Co Coating through Underwater Shock Compaction)

Cemented Carbides for Mining, Construction and Wear Parts

Thermal residual stress analysis of diamond coating on graded cemented carbides

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