cemented carbide microstructures

This article presents detailed microstructure characterization of cemented carbide fabricated by selective laser melting process. Nickelcoated tungsten carbide powders were used for this study the selective laser melting process induced complex microstructure consisting of partiallymelted carbide, carbide precipitates and dendritic microstructure.

The paper aims at categorising cemented carbides in a structured way and to serve as an introduction to cemented carbide microstructures for engineers, researchers and scientists. View fulltext Data

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Cemented tungsten carbide WC is commonly used for wearresistant applications, such as cutting tools and abrasives due to its extremely high hardness. This hardness leads to postprocess machining of WC to be time and costintensive. This study examined the feasibility of additive manufacturing of cemented WC to nearnetshape in an effort to reduce postprocess machining.

As tungsten carbide has a very low linear expansion coefficient, WCCo cemented carbides have values of approximately half that of ferritic and martensitic steels while the ratio to austenitic steels is about 13. If titanium carbide is included, the values will be slightly higher than for straight WCCo cemented carbides.

Microstructures of dipped round bars were changed from homogeneous sinter structure to threelayer structure, cemented carbide, diffusion layer, and reaction layer. The thicknesses of the diffusion layer and the reaction layer were increased with increasing of dipping time.

WCCo cemented carbide is one of the widely hard materials used for cutting in machining industry, due to its microstructural and mechanical stability even at high temperature. However, diffusion wear is the most serious problem that WCCo suffers from. One of the most applied approaches to improve the WCCo cemented carbide performances is the addition of transition metal carbides such as

The paper aims at categorising cemented carbides in a structured way and to serve as an introduction to cemented carbide microstructures for engineers, researchers and scientists.

Commercial cemented carbide bars 15 mm marked YG10 were used in the present study. The composition of the cemented carbide is 10 wt Co and WC with average grain size 1.2 m. The cemented carbide bars were severed into cylinders 15 mm 8 mm as specimens by wire cut electrical discharge machining WEDM method. Prior to the

Categorisation of cemented carbide microstructures selected in this work. In 2016, the 90th anniversary of cemented carbides was celebrated in a special symposium during the Euro PM 2016 conference in Hamburg, Germany, pointing out that cemented carbides are quite new materials. The first patents about cemented carbides were issued in 1923 to

In this paper, WC10Ni 3 Al cemented carbides were prepared by the powder metallurgy method, and the effects of ballmilling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic solvent can be absorbed into the mixed powders by ballmilling when ethanol CH 3 CH 2 OH is used as a

Mapping of relevant cemented carbide microstructures. Cemented carbides classified based on microstructure and chemistry. Microstructure linked to properties and applications. Review covers historical background and current and future trend for each class of materials.

This chapter deals with selected properties of cemented carbides and their testing. It consists of three main subchapters. The first one covers the degradation processes associated with grinding of cemented carbides. Among those, the focus is on the effects of thermal loads and reactions with the environmentthe atmosphere. The second main subchapter describes the origin of residual

In this review selected cemented carbide and cermet microstructures are presented. The focus is on microstructures, both those that are already established in the cemented carbide industry and those which have drawn scientific attention due to new potential applications.

Types of Cermets ceramics metals Metals Used in the Mining, Machining and Aerospace industries Contributes Billions rands in SA economy Why Spark plasma sintering SPS over Liquid phase sintering LPS Aims and objectives Aim To better understand the effect of the

In this paper, the microstructures and properties of coating from cemented carbide of WCFeCoNi on the substrate 45 steel are studied. The effects of sintering temperature on the microstructures of coating, the interface structures between coating and the substrate, the microhardness distribution and its wear resistance in the coating

Ultrafine tungsten carbidenickel WCNi cemented carbides with varied fractions of silicon carbide SiC nanowhisker 03.75 wt. were fabricated by spark plasma sintering at 1350C under a uniaxial pressure of 50 MPa with the assistance of vanadium carbide VC and tantalum carbide TaC as WC grain growth inhibitors.

The objective of this paper is to give an overview on sintering process of WCCo cemented carbides in metal injection molding technology. Metal injection molding is an advanced and promising

The composition of a cemented carbide dictates extensively its shrinkage behaviour and the aim of present work is to extend the constitutive modelling to enable simulations for alloys covering dierent grain sizes, varying carbon contents and addition of cubic carbides. Due to the complexity of cemented carbide sintering, the aim of a reasonably

4.1 The microstructure of a cemented carbide affects the material39s mechanical and physical properties. This guide is not intended to be used as a specification for carbide grades. Producers and users may use the microstructural information as a guide in developing their own specifications.