Fabrication and performances of WC‐Co cemented carbide with a low cobalt content

2021 ◽  
Author(s):  
Xiao‐Hui Yang ◽  
Kai‐Fei Wang ◽  
Guo‐Hua Zhang ◽  
Kuo‐Chih Chou
Keyword(s):  
Cobalt Content ◽  
Cemented Carbide

The Effect of Grain Size and Cobalt Content on the Wear of Ultrafine Cemented Carbide Tools

2014 ◽  
Vol 875-877 ◽  
pp. 1344-1351
Author(s):  
Jian Bing Cheng ◽  
Si Qin Pang ◽  
Xi Bin Wang ◽  
Xi Bin Wang ◽  
Chen Guang Lin
Keyword(s):  
Grain Size ◽  
Tool Wear ◽  
Tool Life ◽  
Wear Mechanism ◽  
Wear Mechanisms ◽  
High Strength Steels ◽  
Cobalt Content ◽  
Cemented Carbide ◽  
Cemented Carbide Tools ◽  
Cutting Speeds

This work contributes to a better understanding of wear mechanisms of ultrafine cemented carbide cutting tools used in turning operation of superalloy and high strength steels at high cutting speeds. The main objective of this work is to verify the influence of grain size and the cobalt content of ultrafine cemented carbide tools on tool life and tool wear mechanism. The main conclusions are that grain size and the cobalt content of ultrafine cemented carbide tools strongly influence tool life and tool wear involve different mechanisms. The wear mechanisms of different grain size and the cobalt content of ultrafine cemented carbide tools observed on the rake face at these conditions were adhesion and notch, at the end of tool life, adhesion was the main wear mechanism at higher cutting speeds.

Influences of Cobalt Content on the Physical and Tribological Properties of Cemented Tungsten Carbide Used in Sheet Metal Forming Application

2014 ◽  
Vol 966-967 ◽  
pp. 80-86
Author(s):  
Varunee Premanond ◽  
Onnjira Diewwanit
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Tungsten Carbide ◽  
Cobalt Content ◽  
Steel Ball ◽  
Cemented Carbide ◽  
Average Grain Size ◽  
Stainless Steel Ball ◽  
Cemented Tungsten Carbide

The objective of this work is to investigate the tribological behavior between WC-Co cemented carbide and austenitic stainless steel under repeated rotation sliding. Influences of cobalt content of commercial grade cemented tungsten carbide on friction coefficient and material transfer phenomena have been explored. Three grades of commercial WC-Co cemented carbide with similar medium WC grain size were employed; WC-12Co, WC-14Co and WC-19Co. The average grain size were ranges between 0.85-1.1 μm and the hardness of about 86-88 HRA have been given by the material maker. The composition analysis and the average grain size of tungsten carbide have been rechecked. Furthermore, the carbide grain size distribution was recorded and the fracture toughness was calculated for each WC-Co grade. The experiments were carried out using ball on disk test. The ball was made from SUS304 grade and the disk was fabricated by 3 grades of WC-Co cemented carbide. The friction coefficient was measured under dry sliding. The characteristics of contact surfaces were explored on the ball as well as on the disk after tests to reveal the presence of a metallic transfer on the WC-Co cemented carbide disk and the wear scar on the ball. The measurement results of wear volume on the stainless steel ball disclosed that maximum wear rate was found from the stainless steel ball rub against WC-19Co tool material.

Adhesion improvement of diamond coatings on cemented carbide with high cobalt content using PVD interlayer

2013 ◽  
Vol 34 ◽  
pp. 70-75 ◽  
Author(s):  
F. Xu ◽  
J.H. Xu ◽  
M.F. Yuen ◽  
L. Zheng ◽  
W.Z. Lu ◽  
...  
Keyword(s):  
Cobalt Content ◽  
Cemented Carbide ◽  
Diamond Coatings

Effect of Decreasing of Cobalt Content in Properties for Diamond∕Cemented Carbide Tools

2010 ◽  
Author(s):  
A. Waratta ◽  
M. Hamdi ◽  
T. Ariga ◽  
Mohamad Rusop ◽  
Wong Tin Wui ◽  
...  
Keyword(s):  
Cobalt Content ◽  
Cemented Carbide ◽  
Cemented Carbide Tools

Production of WC-15Co ultrafine-grained hard alloy from powder obtained by VK15 alloy waste spark erosion in water

2020 ◽  
pp. 4-16
Author(s):  
M. I. Dvornik ◽  
E. A. Mikhailenko
Keyword(s):  
Carbon Content ◽  
Dendritic Structure ◽  
Cobalt Content ◽  
Cemented Carbide ◽  
Grain Structure ◽  
Vacuum Sintering ◽  
Initial Alloy ◽  
Ultrafine Grained ◽  
Spark Erosion ◽  
Grain Diameter

The study covers the possibility of WC-15Co ultrafine cemented carbide production from powder obtained by spark erosion (SE) of VK15 cemented carbide waste in water. As a result of SE in an oxygen-containing liquid (H2O), the carbon content in the resulting powder decreases from 5.3 to 2.3 %. When the powder is heated to 900 °C in vacuum, the carbon content decreases to 0.2 % due to the presence of oxygen. The powder obtained consists of WC, W2C and Co phases. Particles have a dendritic structure consisting of newly formed tungsten-containing grains and cobalt interlayers. The controlled removal of oxygen and carbon replenishment in the resulting powder were carried out by heating in the CO atmosphere to t = = 900 °C. The processed powder has a required phase composition (WC + Co) and carbon content (5.3 %). Particles retain their spherical shape after carbon replenishment. WC grains in particles become plate-shaped with the space between them filled with cobalt. The average grain diameter is smaller than in the initial alloy. The vacuum sintering of the resulting powder at 1390 °C made it possible to obtain WC–15Co ultrafine-grained cemented carbide with an average WC grain diameter of 0.44 μm. It is several times smaller than the average grain diameter in the initial alloy (1.8 μm). Most grains retain their plate shape. The resulting alloy combines high hardness (1620 HV), increased fracture toughness (13.2 MPa·m1/2) and strength (1920 MPa) due to its fine-grain structure and 15 % cobalt content. In terms of the set of its properties, this alloy is not inferior to analogues obtained by other methods.

Effect of Grain Refinement and Composition on the Wear of Cemented Carbide Cutting Tools

2013 ◽  
Vol 456 ◽  
pp. 507-511
Author(s):  
Jian Bing Cheng ◽  
Si Qin Pang ◽  
Xi Bin Wang ◽  
Qi Xun Yu
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Tool Life ◽  
Cutting Tools ◽  
Cobalt Content ◽  
Cemented Carbide ◽  
Cutting Inserts ◽  
Stereo Microscope ◽  
Different Grain Size ◽  
Flank Surface

Tool life tests of continuous cutting superalloy GH2132 were carried out by WC/Co cemented carbide cutting inserts of different grain size and cobalt content, and flank surface wear morphology of the cutting inserts were observed by ZEISS continuous zoom stereo microscope and microphotograph system. The results show that grain size and cobalt content strongly influence the cutting tool life and tool wear, grain refinement and proper cobalt content are help to improve the tool life and the wear resistance of WC/Co cemented carbide. The wear mechanisms of different grain size and cobalt content of ultrafine cemented carbide tools were adhesion and notch, among them, adhesive was the main wear mechanism at higher cutting speeds.

Increasing the Fracture Resistance of Cemented Carbides During the Drilling of Iron Ores

1978 ◽  
Vol 100 (1) ◽  
pp. 74-76 ◽  
Author(s):  
J. Peck
Keyword(s):  
Grain Size ◽  
Tungsten Carbide ◽  
Fracture Resistance ◽  
Iron Ore ◽  
Cobalt Content ◽  
Cemented Carbide ◽  
Iron Ores ◽  
Two Parameters ◽  
Carbide Insert ◽  
And Tungsten

Investigation shows that there is a preferred cobalt content for a given hardness of a cemented carbide insert when used in a bit which is drilling iron ore. Two parameters determine the hardness of a cemented carbide: cobalt percent and tungsten carbide grain size. By manipulating these two parameters, a number of cemented carbide materials can be made which have the same hardness. Three iron-ore drilling tests have been conducted where test bits contained materials having essentially the same hardness, but where the materials were varied through a range of cobalt content and tungsten carbide grain size. Graphs are presented which depict the effect on fracture resistance of varying the cobalt content-tungsten carbide grain size. In each test, one material showed superior fracture resistance. The test bits drilled iron ores such as hematite or taconite.

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