Effect of Ta, Nb and V Additions on the Microstructure and Mechanical Properties of (W,Ti)C-Co

2012 ◽  
Vol 535-537 ◽  
pp. 783-786
Author(s):  
Yan Wu ◽  
Hai Xia Xin ◽  
Yu Chun Zhai
Keyword(s):  
Mechanical Properties ◽  
Grain Growth ◽  
Growth Inhibitor ◽  
Grain Growth Inhibitor ◽  
Microstructure And Mechanical Properties ◽  
Nb Addition

(W,Ti)C-10%Co system cermets doped with Ta, Nb or V grain growth inhibitor were prepared in this work. The effect of Ta, Nb and V on the microstructure and mechanical properties of (W0.8783Ti0.0976VB0.0242)C-10%Co systems was investigated. The results show that the three elements play an important role on the WC grain growth and shape; the cermets appeared uniformly distributed as whiskers or thin platelets. V results in the hardest material, Ta causes the material to become harder compared with (W0.9Ti0.1)C-10%Co cermets. But the hardness of cermets with Nb addition decrease because of the increasing of porosity.

Effect of Grain Growth Inhibitor on the Microstructure and Mechanical Properties of Ti(C,N)-Based Cermet

2007 ◽  
Vol 280-283 ◽  
pp. 1413-1416 ◽  
Author(s):  
Yong Zheng ◽  
Wen Jun Liu ◽  
Quan Yuan ◽  
Lei Wen ◽  
Wei Hao Xiong
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Liquid Metal ◽  
Grain Growth ◽  
Vanadium Carbide ◽  
Growth Inhibitor ◽  
Grain Growth Inhibitor ◽  
Microstructure And Mechanical Properties ◽  
Transmission Electron ◽  
Lower Extent

Several Ti(C,N)-based cermets with different grain growth inhibitor were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX). The microstructure and mechanical properties of a cermet as a function of the content of the typical grain growth inhibitors, such as vanadium carbide (VC) and chromium carbide (Cr3C2), was revealed. VC addition could remarkably refine the grains, but it reduced the wetting of the ceramic grains by liquid metal during sintering. Thus it still reduced the performances of the cermet. Cr3C2 addition was found to inhibit grains from growing to lower extent during sintering. However it reduced the wetting of the ceramic grains by liquid metal slightly. Most of chromium element congregated in the rim phase and improved the plasticity of the rim. With Cr3C2 added properly, the performances of the cermets were improved remarkably.

Physical and Mechanical Properties of WC-Co Submicron Powders Using P/M Technique

2014 ◽  
Vol 879 ◽  
pp. 12-15 ◽  
Author(s):  
Ahmad Aswad Mahaidin ◽  
Mohd Asri Selamat ◽  
Samsiah Abdul Manaf ◽  
Talib Ria Jaafar
Keyword(s):  
Mechanical Properties ◽  
Grain Growth ◽  
Vanadium Carbide ◽  
Physical And Mechanical Properties ◽  
Growth Inhibitor ◽  
Cold Isostatic Pressing ◽  
Mixing Process ◽  
Sintering Process ◽  
Grain Growth Inhibitor ◽  
Work Done

The properties of WC-Co are greatly improved with the use of submicron powders. However, grain growth tends to occur during the sintering process which causes the properties to deteriorate to some extent. Free carbon and vanadium carbide are added in this study to serve as grain growth inhibitor. The effect of these two materials is evaluated based on WC-Co properties. In this work, the powders are mixed together via wet mixing process, compacted and undergo cold-isostatic pressing (CIP) before the samples are sintered in the temperature range of 1350-1450°C under nitrogen-based atmosphere. The physical and mechanical properties of the WC-Co sintered powders were analysed. Based on the work done, the WC-Co-C has a better properties compared to WC-Co-VC.

Effect of VC, TaC and NbC Additions on Microstructure and Properties of Ultrafine WC-10%Co Cemented Carbides

2013 ◽  
Vol 320 ◽  
pp. 281-286 ◽  
Author(s):  
Hao Yu ◽  
Wan Ni Li ◽  
Xian Quan Jiang ◽  
Peng He Jiao
Keyword(s):  
Mechanical Properties ◽  
Grain Growth ◽  
Growth Inhibitor ◽  
Cemented Carbides ◽  
Testing Methods ◽  
Vacuum Sintering ◽  
Microstructure And Properties ◽  
Grain Growth Inhibitor

The ultrafine WC-10%Co cemented carbides were prepared by vacuum sintering processing. To inhibit the growth of WC grains during sintering, single VC, TaC and NbC were used as inhibitors. Effects of VC, TaC and NbC as grain growth inhibitor on the microstructure and properties of ultrafine WC-10%Co cemented carbides were investigated with different kinds of testing methods. With the transformation of doped inhibitors content, the results show that VC, TaC and NbC additions can refine the WC grains, and increase the mechanical properties of the WC-10%Co cemented carbides, respectively. And the efficiency of these three kinds of inhibitors to limit gain size has been compared after sintering for 1.5h at 1 400 °C.

scholarly journals Study on Microstructure and Mechanical Properties of WC-10Ni3Al Cemented Carbide Prepared by Different Ball-Milling Suspension

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2224 ◽  
Author(s):  
Minai Zhang ◽  
Zhun Cheng ◽  
Jingmao Li ◽  
Shengguan Qu ◽  
Xiaoqiang Li
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Ball Milling ◽  
Grain Growth ◽  
Organic Solvents ◽  
Crack Deflection ◽  
Cemented Carbides ◽  
Powder Metallurgy Method ◽  
Microstructure And Mechanical Properties ◽  
Α Al2o3

In this paper, WC-10Ni3Al cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling 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 ball-milling when ethanol (CH3CH2OH) is used as a ball-milling suspension. This oxygen leads to the formation of α-Al2O3 during sintering, which improves the fracture toughness, due to crack deflection and bridging, while the formation of η-phase (Ni3W3C) inhibits the grain growth and increases the hardness. Alternatively, samples milled using cyclohexane (C6H12) showed grain growth during processing, which led to a decrease in hardness. Therefore, the increase of oxygen content from using organic solvents during milling improves the properties of WC-Ni3Al composites. The growth of WC grains can be inhibited and the hardness can be improved without loss of toughness by self-generating α-Al2O3 and η-phase (Ni3W3C).

scholarly journals Chromium Effect as Grain Growth Inhibitor of Nanostructured WC-10Co after Sintering by Hot Isostatic Pressing

2018 ◽  
Vol 24 (S1) ◽  
pp. 2300-2301
Author(s):  
C. G. Garay-Reyes ◽  
M. A. Ruiz-Esparza-Rodriguez ◽  
I. Estrada Guel ◽  
S. E. Hernandez-Martinez ◽  
J.L. Hernandez-Rivera ◽  
...  
Keyword(s):  
Grain Growth ◽  
Hot Isostatic Pressing ◽  
Growth Inhibitor ◽  
Isostatic Pressing ◽  
Grain Growth Inhibitor ◽  
Chromium Effect

Effect of Grain Growth Inhibitor on the Wear of Ultrafine Cemented Carbide Cutting Inserts

2013 ◽  
Vol 423-426 ◽  
pp. 720-724
Author(s):  
Jian Bing Cheng ◽  
Si Qin Pang ◽  
Xi Bin Wang ◽  
Qi Xun Yu
Keyword(s):  
Grain Growth ◽  
Energy Dispersive Spectrometry ◽  
Adhesive Wear ◽  
Growth Inhibitor ◽  
Cemented Carbide ◽  
Grain Growth Inhibitor ◽  
Life Tests ◽  
Cutting Inserts ◽  
Stereo Microscope ◽  
Flank Surface

By using the method of low pressure sintering, both of adding and not adding grain growth inhibitor of WC-Co ultra-fine cemented carbide cutting inserts were prepared, tool life tests of continuous cutting superalloy GH2132 were carried out, respectively. ZEISS continuous zoom stereo microscope and microphotograph system were used to observe flank surface wear morphology of the cutting inserts, and analysis the topography and elements of central wear region of flank surface by X-ray energy dispersive spectrometry and scanning electron microscope. The results show that the main wear mechanism of ultrafine cemented carbide cutting inserts is adhesive wear, and the wear resistance of ultrafine cemented carbide cutting inserts that added grain growth inhibitor is superior to no grain growth inhibitor, adding grain growth inhibitor helps increase the resistance of abrasive wear, adhesive wear and oxidative wear as well as diffusive wear of cutting inserts).

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