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).

Progress of Research in the Action Mechanism of Grain Growth Inhibitor for Cemented Carbide

2014 ◽  
Vol 997 ◽  
pp. 356-358 ◽  
Author(s):  
Jun Wang
Keyword(s):  
Grain Growth ◽  
Growth Inhibitor ◽  
Cemented Carbide ◽  
Action Mechanism ◽  
Research Results ◽  
Grain Growth Inhibitor ◽  
Growth Inhibiting

Three hypotheses for the grain growth inhibiting mechanism of carbide grain were described in this paper: the dissolution hypothesis, the adsorption hypothesis and the segregation hypothesis. The weakness of these three existing hypotheses has been pointed out. On the basis of analyzing the existing research results of other researchers, this paper proposed a new grain growth inhibiting mechanism: segregation - dissolution hypothesis.

Synthesis of WC-10wt.%Co Nanocrystalline Powders with Grain Growth Inhibitor by MTP

2007 ◽  
Vol 534-536 ◽  
pp. 1237-1240 ◽  
Author(s):  
Dong Kyu Park ◽  
Kwang Chul Jung ◽  
Jin Chun Kim ◽  
Sung Yeal Bae ◽  
In Sup Ahn
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Liquid Phase ◽  
Grain Growth ◽  
Growth Inhibitor ◽  
Liquid Phase Sintering ◽  
Nanocrystalline Powders ◽  
Grain Growth Inhibitor ◽  
Nano Crystalline ◽  
Carburizing Process

To improve the fracture strength and wear resistance of WC-Co cemented carbide, various technologies have been developed related producing the nano crystalline. There have been extensive studied conducted to retard grain growth during liquid phase sintering. However, when this inhibitor is added by simple mixing, a micro-pores forms during sintering In this study, WC-Co nanocrystalline powders with grain growth inhibitor in the site were prepared by MTP (Mechano-Thermic carburizing Process) to minimize this formation of micro pores and to retard grain growth effectively during sintering. In addition, then the phase and grain size of WC-Co nanocrystalline powders were evaluated according to the condition of MTP.

A Low Temperature Synthesized NbC Grain Growth Inhibitor in WC-Co Hardmetal Alloy

2001 ◽  
Vol 189-191 ◽  
pp. 282-287
Author(s):  
Uilame Umbelino Gomes ◽  
C. de Souza ◽  
Francisca de Fatima P. Medeiros ◽  
A.G.P. Silva ◽  
C. Ciaravino ◽  
...  
Keyword(s):  
Low Temperature ◽  
Grain Growth ◽  
Growth Inhibitor ◽  
Grain Growth Inhibitor

scholarly journals Metallic glassy Ti2Ni grain-growth inhibitor powder for enhancing the hydrogenation/dehydrogenation kinetics of MgH2

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 1036-1046 ◽  
Author(s):  
Mohamed Sherif El-Eskandarany
Keyword(s):  
Grain Growth ◽  
Glassy Alloy ◽  
Growth Inhibitor ◽  
Grain Growth Inhibitor ◽  
Dehydrogenation Kinetics ◽  
Kinetics Of

Metallic glassy alloy is considered as one of the best option used to enhance the kinetics behavior of MgH2.

High-temperature stability of nanocrystalline structure in a TiAl alloy prepared by mechanical alloying and hot isostatic pressing

1998 ◽  
Vol 13 (12) ◽  
pp. 3399-3410 ◽  
Author(s):  
O. N. Senkov ◽  
N. Srisukhumbowornchai ◽  
M. L. Öveçoglu ◽  
F. H. Froes
Keyword(s):  
Grain Size ◽  
Mechanical Alloying ◽  
Grain Growth ◽  
Hot Isostatic Pressing ◽  
Nanocrystalline Structure ◽  
Temperature Stability ◽  
Growth Exponent ◽  
Pinning Force ◽  
High Temperature Stability ◽  
Isostatic Pressing

A fully dense nanocrystalline compact of the Ti–47Al–3Cr (at. %) alloy was produced by mechanical alloying and hot isostatic pressing at 725 °C. Microstructure characteristics and grain growth behavior of this compact were studied after annealing for up to 800 h in the temperature range of 725 to 1200 °C, using analytical transmission electron microscopy techniques. The temperature and time dependencies of the grain sizes and the grain size distributions were determined. The grain growth occurred, with a timeand temperature-invariant single-peak grain size distribution (when normalized by the mean grain size), which was consistent with normal grain growth. The experimentally measured grain growth exponent decreased from 10 to 4.6 when the temperature was increased. The grain growth kinetics was described by a single thermally activated rate process limited by a permanent pinning force on the grain boundaries. The microhardness decreased on annealing and followed the Hall–Petch relationship with the parameters Hυo = 5.8 GPa and KH = 1.6 MPa m0.5.

Effects of Combined Addition of Cr3C2 and NbC on Microstructure and Properties of Cemented Carbides Prepared by WС-Co Composite Powder

2016 ◽  
Vol 849 ◽  
pp. 794-800 ◽  
Author(s):  
Ai Min Jiang ◽  
Quan Li ◽  
Feng Jie Yang
Keyword(s):  
Grain Growth ◽  
Composite Powder ◽  
Rupture Strength ◽  
Growth Inhibitor ◽  
Interface Energy ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Binder Phase ◽  
Microstructure And Properties ◽  
Grain Growth Inhibitor

With addition various contents of combined grain growth inhibitors Cr3C2 and NbC into the ultrafine WC-Co6% composite powder, and the effects of codoped Cr3C2 and NbC addition on microstructure and properties of the alloys have been investigated by X-ray diffraction, scanning electron microscopy. The results showed that increasing the content of inhibitors in the composite powder, the abnormal grain growth disappeared and homogeneous ultrafine grain structure formed, i.e., the grain growth inhibitor promoted sintering densification process. WC grains were refined by the comprehensive effects of the Cr3C2/NbC dissolving in the Co phase to alter the interface energy and interfere the WC solution in the binder phase, which prevents the structure of cobalt change from the face-center-cubic into dense-hexagonal crystal, and to increases the transverse rupture strength.

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.

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