Chemistry of binder phase grain boundary in WC–Co based cemented carbide

2013 ◽  
Vol 41 ◽  
pp. 366-369 ◽  
Author(s):  
Jonathan Weidow ◽  
Eva Olsson ◽  
Hans-Olof Andrén
Keyword(s):  
Grain Boundary ◽  
Cemented Carbide ◽  
Binder Phase

High Energy Milling of WС-FeСr Cemented Carbide

2019 ◽  
Vol 799 ◽  
pp. 136-141
Author(s):  
Marek Tarraste ◽  
Jakob Kübarsepp ◽  
Kristjan Juhani ◽  
Märt Kolnes ◽  
Mart Viljus
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Size Range ◽  
High Energy ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
Binder Phase ◽  
Metal Powders ◽  
Powder Mixtures ◽  
High Energy Milling

During production of cemented carbides hard and brittle tungsten carbide (WC) and ductile metal powders (mainly from Fe-group) are milled together. Complete milling results in a Gaussian distribution and narrow particle size range of the milled powder which promote the homogeneity and improve the properties of sintered composites. Cobalt, conventional metal employed in cemented carbides, possesses good comminution characteristics with WC powder. However, its toxicity and fluctuating price pushes researchers to find suitable alternatives and Fe-based alloys have shown most promising results. Cemented carbides with the Fe-Cr system as metal binder phase have potential to perform better than regular WC-Co composites in corrosive and oxidative environments. The goal of this paper was to prepare uniform cemented carbides powders with relatively high fraction of stainless Fe-Cr steel. To achieve a uniform powder mixture is a challenge at high ductile steel fraction. High energy milling (HEM) is a powerful technique for achieving (ultra) fine powder mixtures with narrow powder size range. HEM was carried out in a novel high energy ball mill RETSCH Emax. Milling in tumbling ball mill, which is the most widely used method, was employed for reference. Prepared powder mixtures were characterised in terms of particle size, size distribution and shape. In addition, powder mixtures were consolidated via spark plasma sintering to evaluate the effect of the milling method and the duration on the microstructure of final cemented carbide.

Wear Behaviour of Two Different Cemented Carbide Grades in Turning 316 L Stainless Steel

2018 ◽  
Vol 941 ◽  
pp. 2367-2372 ◽  
Author(s):  
Sara Saketi ◽  
Ulf Bexell ◽  
Jonas Östby ◽  
Mikael Olsson
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Wear Behavior ◽  
Cutting Tools ◽  
Cemented Carbide ◽  
Wear Behaviour ◽  
Binder Phase ◽  
Mechanical Wear ◽  
Cutting Insert

Cemented carbides are the most common cutting tools for machining various grades of steels. In this study, wear behavior of two different cemented carbide grades with roughly the same fraction of binder phase and carbide phase but different grain size, in turning austenitic stainless steel is investigated. Wear tests were carried out against 316L stainless steel at 180 and 250 m/min cutting speeds.The worn surface of cutting tool is characterized using high resolution scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Auger electron spectroscopy (AES) and 3D optical profiler.The wear of cemented carbide in turning stainless steel is controlled by both chemical and mechanical wear. Plastic deformation, grain fracture and chemical wear is observed on flank and rake face of the cutting insert. In the case of fine-grained, the WC grains has higher surface contact with the adhered material which promotes higher chemical reaction and degradation of WC grains, so chemical wear resistance of the composites is larger when WC grains are larger. The hardness of cemented carbide increase linearly by decreasing grain size, therefore mechanical wear resistance of the composites is larger when WC grains are smaller.

Analysis of WC Dissolution Phenomenon Happened in TIG Welded Joint of Cemented Carbide and Invar Alloy

2012 ◽  
Vol 184-185 ◽  
pp. 896-899 ◽  
Author(s):  
Pei Quan Xu ◽  
Ding Ma ◽  
Chun Wei Ma
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Welded Joint ◽  
Cemented Carbide ◽  
Invar Alloy ◽  
Scanning Method ◽  
Invar Alloys ◽  
Element Diffusion ◽  
Welded Seam ◽  
Shape Changes

In current research, WC dissolution phenomenon happened in TIG welds was investigated and discussed. And the element diffusion was studied using area-scanning method. The results showed that the WC dissolution phenomenon always happened near WC-Co/Welded seam interface. Moreover, the amount of WC dissolved in welds became less from WC-Co, welds to invar alloys. WC dissolution happened in welded seam induced by tungsten arc led to the WC grain growth (60µm or so) and WC shape changes. The grain boundary (GB) between different WC particles during WC aggregation was also confirmed and WC grain growth was owed to the WC aggregation during the processing of WC dissolution.

ON THE USE OF Mo/Mo2C GRADIENT INTERLAYERS IN DIAMOND DEPOSITION ONTO CEMENTED CARBIDE SUBSTRATES

2016 ◽  
Vol 23 (02) ◽  
pp. 1550109 ◽  
Author(s):  
JIE GAO ◽  
HONGJUN HEI ◽  
KE ZHENG ◽  
XUEYAN GAO ◽  
XIAOPING LIU ◽  
...  
Keyword(s):  
Diffusion Layer ◽  
Cemented Carbide ◽  
Binder Phase ◽  
Diamond Coatings ◽  
Diamond Deposition ◽  
Depth Direction ◽  
Gradient Diffusion ◽  
Glow Plasma ◽  
Excellent Adhesion ◽  
Plasma Surface Alloying

Molybdenum/molybdenum carbide (Mo/Mo2C) gradient interlayers were prepared via double glow plasma surface alloying (DGPSA) technique onto cemented carbide (WC–Co) substrates for diamond deposition. The morphologies, phase composition and adhesion of the interlayers were investigated, as well as their effect on the subsequent diamond deposition. The results indicated that the Mo/Mo2C gradient interlayer deposited on WC–Co substrate was composed of 4.0-[Formula: see text]m-thick diffusion layer and 2.7-[Formula: see text]m-thick deposition layer. The Mo concentration decreased gradually with the depth direction whereas the Co and W concentrations increased. As a result, the Co binder phase was completely restricted within the substrate by the diffusion layer. The presence of gradient diffusion layer ensured excellent adhesion of the interlayer. Subsequently, nanocrystalline diamond coatings with excellent adhesion were deposited on the interlayered substrates. Thus, the Mo/Mo2C gradient interlayers deposited via DGPSA technique were demonstrated as a novel option for depositing adherent diamond coatings on WC–Co substrates.

Grain boundary in cemented carbide

1995 ◽  
Vol 71 (5) ◽  
pp. 289-292 ◽  
Author(s):  
Tetsuya Suzuki ◽  
Kunio Shibuki ◽  
Toshiyuki Suzuki ◽  
Yuichi Ikuhara
Keyword(s):  
Grain Boundary ◽  
Cemented Carbide

Experiments of Rock Cutting with Nano-Cemented Carbide

2013 ◽  
Vol 423-426 ◽  
pp. 962-965
Author(s):  
Ji Cai Kuai
Keyword(s):  
Cutting Speed ◽  
Microscopic Analysis ◽  
High Hardness ◽  
Oil Field ◽  
Cemented Carbide ◽  
Binder Phase ◽  
Hard Phase ◽  
Field Development ◽  
Hard And Brittle Material ◽  
Machinery Manufacturing

Nano cemented carbide is a new style cutter material. Because its grain size is very small, it is superior to common cemented carbide in properties, such as high hardness, fracture toughness, flexural strength and higher abrasion resistance. It is proposed to have wide application prospect to tools and mould manufacturing, machinery manufacturing, geological drilling, mining, oil field development, etc. In this paper, nanocemented carbide tool was ground with ELID technology, and the marble were cut with nanocemented carbide, and the cutting properties of nanocemented carbide were studied. Results imply that the tool life of nanocemented carbide is 0.5-1 times longer than that of common cemented carbide at low cutting speed. Which means the nanocemented carbide is more suitable for machining hard and brittle material than common cemented carbides at low cutting speed. And the microscopic analysis showed, the mechanism of tool wear is the abrasive wear as well as the shedding of WC hard phase within Co phase caused by the hard spots shed from the marble embedding in the internal part of binder phase Co which is located in the hard phase WC.

scholarly journals Preparation of Cemented Carbide with FeAl Binder Phase by Pulsed Current Sintering Process.

2000 ◽  
Vol 47 (5) ◽  
pp. 510-514 ◽  
Author(s):  
Minoru Fukunaga ◽  
Masahiro Machida ◽  
Keizo Kobayashi ◽  
Kimihiro Ozaki
Keyword(s):  
Cemented Carbide ◽  
Pulsed Current ◽  
Binder Phase ◽  
Sintering Process

Residual Stress Relaxation in Cemented Carbide Composites Studied Using the Argonne Intense Pulsed Neutron Source

1983 ◽  
Vol 27 ◽  
pp. 239-249 ◽  
Author(s):  
A. D. Krawitz ◽  
R. Roberts ◽  
J. Faber
Keyword(s):  
Residual Stress ◽  
Plastic Strain ◽  
Neutron Source ◽  
General Purpose ◽  
Cemented Carbide ◽  
Binder Phase ◽  
Loading Mode ◽  
High Plastic Strain ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

AbstractCemented carbide composites with a WC hard phase and a Co-Ni alloy binder phase have been subjected to monotonic and cyclic deformation and studied using the high resolution General Purpose Powder Diffractometer at the Argonne Intense Pulsed Neutron Source. Upon deformation, relaxation of bulk differential thermal residual stresses, tensile in the binder and compressive in the carbide, is observed to occur as a function of loading mode and plastic strain via shifts in diffraction peak positions. In addition, peak breadth behavior indicates broadening. At low plastic strain this is due primarily to a range of residual stress and at high plastic strain it is attributable to the plastic deformation alone since relaxation is essentially complete. The appropriateness of neutrons is discussed.

Gradient Characteristic of Functionally Graded Cemented Carbide

2010 ◽  
Vol 97-101 ◽  
pp. 1332-1335
Author(s):  
Ping Feng ◽  
Yue Hui He ◽  
Xiao Hua Sun ◽  
Guang Hong Ni ◽  
Yi Hua Sun
Keyword(s):  
Volume Fraction ◽  
Functionally Graded ◽  
Cemented Carbide ◽  
Binder Phase ◽  
Free Layer ◽  
Average Composition ◽  
Graded Structure ◽  
Concentration Peak ◽  
Scanning Electron ◽  
Functionally Graded Structure

The invention of functionally graded structure cemented carbide is a significant revolution. In this paper, graded structure cemented carbide with cubic carbide free layer (CCFL) was prepared. Using scanning electron microscope (SEM), metallographical microscope, electroprobe microanalyzer and microindentation, the gradient characteristics were investigated. The variation in elemental compositions from surface to inner is gradient, the concentrations of nitrogen and titanium are very low in surface layer, only element of tungsten, cobalt and carbon exist. A cobalt concentration peak occurs, which is higher than the average composition in bulk. Wherein binder phase piles up, its volume fraction is much higher than nominal value, resulting in a decrease in hardness and forming a tough layer.

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