Nuclear microprobe characterization of defects in zinc recycled cemented carbides

2019 ◽  
Vol 452 ◽  
pp. 7-11
Author(s):  
C.S. Freemantle ◽  
M. Topic ◽  
C.A. Pineda-Vargas
Keyword(s):  
Cemented Carbides ◽  
Nuclear Microprobe

Characterization of PE-g-HEMA films prepared by gamma irradiation through nuclear microprobe techniques

2012 ◽  
Vol 81 (9) ◽  
pp. 1319-1323 ◽  
Author(s):  
L.M. Ferreira ◽  
J.P. Leal ◽  
P.A. Rodrigues ◽  
L.C. Alves ◽  
A.N. Falcão ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Nuclear Microprobe

scholarly journals Microstructure characterization of ODS-RAFM steels

2008 ◽  
Vol 1125 ◽  
Author(s):  
R. Mateus ◽  
P.A. Carvalho ◽  
D. Nunes ◽  
L.C. Alves ◽  
N. Franco ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Proton Beam ◽  
Nuclear Microprobe ◽  
Elemental Distribution ◽  
Electron Backscattered Diffraction ◽  
Ods Steel ◽  
Transmission Electron ◽  
Eurofer 97

ABSTRACTResults of the microstructural characterization of four different RAFM ODS Eurofer 97 batches are presented and discussed. Analyses and observations were performed by nuclear microprobe and scanning and transmission electron microscopy. X-ray elemental distribution maps obtained with proton beam scans showed homogeneous composition within the proton beam spatial resolution and, in particular, pointed to a uniform distribution of ODS (yttria) nanoparticles in the Eurofer 97 matrix. This was confirmed by transmission electron microscopy. Scanning electron microscopy coupled with energy dispersive spectroscopy made evident the presence of chromium carbide precipitation. Precipitates occurred preferentially along grain boundaries (GB) in three of the batches and presented a discrete distribution in the other, as a result of different thermo-mechanical routes. Additional electron backscattered diffraction experiments revealed the crystalline textures in the ferritic polycrystalline structure of the ODS steel samples.

Characterization of WC-VC-Co Cemented Carbides Using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS)

1997 ◽  
Vol 3 (S2) ◽  
pp. 717-718
Author(s):  
F. Arenas ◽  
I. B. de Arenas ◽  
J. Ochoa ◽  
S. A. - Cho
Keyword(s):  
Cutting Tool ◽  
Tool Material ◽  
Liquid Phase Sintering ◽  
Cemented Carbides ◽  
Metal Carbides ◽  
Vacuum Sintering ◽  
X Ray ◽  
Transition Metal Carbides ◽  
Cylindrical Samples

The two important constituents of metallic tool alloys are transition metal carbides and metals of the iron group, Fe, Ni, Co. Combining them, based on WC, it is obtained a hard and tough cutting tool material. Many attempts have been made to develop alternative cemented carbide systems by substituting a portion of WC by other hard phases. In this investigation, microstructure and phases composition of 90 mass% [ (1-y) WC - y VC ] - 10 mass% Co with y = 0, 0.2, 0.4, 0.6 and 1.0 sintered cemented carbides were studied by Backscattering electron (BSE) compositional images, elemental dot maps and X - ray microanalysis. These techniques have allowed to determine the different phases present, their morphology and composition.Cylindrical samples of 10 mm. in diameter and height were manufactured by vacuum sintering at 1400°C of uniaxially pressed compacts at 350 MPa. Liquid phase sintering is the predominant consolidation mechanism present in this system.

Impurity characterization of zinc-recycled WC-6wt.% Co cemented carbides

2014 ◽  
Vol 44 ◽  
pp. 94-102 ◽  
Author(s):  
C.S. Freemantle ◽  
N. Sacks ◽  
M. Topic ◽  
C.A. Pineda-Vargas
Keyword(s):  
Cemented Carbides

Nanohardness of Individual Phases in WC – Co Cemented Carbides

2013 ◽  
Vol 586 ◽  
pp. 23-26 ◽  
Author(s):  
Annamária Duszová ◽  
Radoslav Halgaš ◽  
Pavol Priputen ◽  
Marek Bľanda ◽  
Pavol Hvizdoš ◽  
...  
Keyword(s):  
Size Effect ◽  
Significant Influence ◽  
Crystallographic Orientation ◽  
Grain Orientation ◽  
Indentation Load ◽  
Cemented Carbides ◽  
Indentation Modulus ◽  
Instrumented Indentation ◽  
Load Size

The nanohardness of WC – Co hardmetals has been investigated using instrumented indentation and Berkovich tip indenter. The nanohardness, HIT, and indentation modulus, EIT, of Co phase and individual WC grains and the influence of their crystalographic orientation have been studied. SEM, AFM and EBSD methods were used for the characterization of the microstructures and indents and for the identification of crystallographic orientation of WC grains, respectively. Strong indentation load-size effect and significant influence of the crystallographic orientation of WC crystals on HIT and EIT have been found. The nanohardness of Co binder was approximately 10 GPa and that of WC grains varied between 25 and 50 GPa, depending on the grain orientation and load. The nanohardness values of the basal and prismatic planes of individual WC grains at load of 10 mN were 40.4 ± 1.6 GPa and 32.8 ± 2.0 GPa, respectively.

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