Effects of Holding Time on the Sintering of Cemented Tungsten Carbide Powder and Bonding with High-Strength Steel Wire

The microstructure and micro-hardness of tungsten carbide/high strength steel (WC/HSS) composites with different particle sizes were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), ultra-high temperature laser confocal microscopy (UTLCM) and micro-hardness testing. The composites were prepared by cold pressing and vacuum sintering. The results show that WC density tends to increase as the average grain size of WC decreases and the micro-hardness of WC increases with the decrease of WC particle size. The micro-hardness of WC near the bonding interface is higher than that in other regions. When the particle size of WC powder particles is 200 nm, a transition layer with a certain width is formed at the interface between WC and HSS, and the combination between the two materials is metallurgical. The iron element in the HSS matrix diffuses into the WC structure in contact with it, resulting in a fusion layer of a certain width, and the composite interface is relatively well bonded. When the average particle size of WC powder is 200 nm, W, Fe and Co elements significantly diffuse in the transition zone at the interface. With the increase of WC particle size, the trend of element diffusion decreases.

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Flexural strengthening of reinforced concrete beams with high-strength steel wire and engineered cementitious composites

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.119284 ◽

2020 ◽

Vol 254 ◽

pp. 119284

Author(s):

Fang Yuan ◽

Mengcheng Chen ◽

Jinlong Pan

Keyword(s):

Reinforced Concrete ◽

High Strength Steel ◽

Concrete Beams ◽

Steel Wire ◽

High Strength ◽

Reinforced Concrete Beams ◽

Cementitious Composites ◽

Engineered Cementitious Composites ◽

Flexural Strengthening

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Surface Modification Process by Electrical Discharge Machining with Tungsten Carbide Powder Mixing in Kerosene Fluid

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.889.115 ◽

2019 ◽

Vol 889 ◽

pp. 115-122

Author(s):

Van Tao Le ◽

Tien Long Banh ◽

Xuan Thai Tran ◽

Nguyen Thi Hong Minh

Keyword(s):

Surface Roughness ◽

Tungsten Carbide ◽

Electrical Discharge ◽

Alloy Powder ◽

Electrical Discharge Machining ◽

Carbide Powder ◽

Micro Hardness ◽

Hard Materials ◽

Tungsten Carbide Powder ◽

Better Than

Electrical discharge machining (EDM) process is widely used to process hard materials in the industry. The process of electrical discharge is changed and called PMEDM when alloy powder is added in the oil dielectric. In the current study, the effect of tungsten carbide alloy powder added in the dielectric on the surface roughness (Ra) and the micro hardness of surface (HV) status of the workpiece SKD61 after machining is investigated. Studies show that the surface roughness and the micro hardness of surface obtained by PMEDM is generally better than that by normal EDM. The method can be applied for improving surface quality such as improving strengthening of molds and machine parts.

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