ChemInform Abstract: PHASE EQUILIBRIA OF THE NICKEL-TUNGSTEN-CHROMIUM SYSTEM IN THE COMPOSITION AND TEMPERATURE RANGES OF THE LIQUID PHASE SINTERING OF HEAVY ALLOYS

1985 ◽  
Vol 16 (18) ◽  
Author(s):  
C. LAUGEE ◽  
C. H. ALLIBERT ◽  
I. ANSARA
Keyword(s):  
Liquid Phase ◽  
Phase Equilibria ◽  
Liquid Phase Sintering ◽  
Heavy Alloys ◽  
Temperature Ranges ◽  
Nickel Tungsten

Thermomechanical Processing of some Heavy Alloys from the System W-Ni-Fe through Rotary Forging

2007 ◽  
Vol 23 ◽  
pp. 111-114
Author(s):  
Radu Mureşan ◽  
Codruta Pavel ◽  
Dana Salomie
Keyword(s):  
Liquid Phase ◽  
Thermal Treatment ◽  
Thermomechanical Processing ◽  
Liquid Phase Sintering ◽  
Neutral Atmosphere ◽  
Reduction Degree ◽  
Rotary Forging ◽  
Heavy Alloys

The goal of present work was to study the possibility to produce bars from heavy alloys based tungsten through rotary forging. For the experiment there were selected two compositions from the system W-Ni-Fe (90, respectively 93 %W/wt., Ni/Fe ratio = 7/3). From the two compositions there were prepared samples by conventional route of liquid phase sintering, followed by thermal treatment in a neutral atmosphere (N2, Ar) and by rotary forging with different reduction degree.

Liquid-Phase Sintering of Tungsten Heavy Alloys

2010 ◽  
Vol 303-304 ◽  
pp. 55-62 ◽  
Author(s):  
S.F. Moustafa ◽  
S.H. Kaitbay ◽  
G.M. Abdo
Keyword(s):  
Liquid Phase ◽  
Sem Analysis ◽  
Liquid Phase Sintering ◽  
Mechanically Alloyed ◽  
Nickel Iron ◽  
Full Characterization ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys ◽  
Vacuum Atmosphere ◽  
Sintered Materials

Elemental powders of tungsten, nickel, iron and cobalt of compositions corresponding to (W-3.2Ni-0.8%Fe), (W-3.5Ni-1.5%Fe), and (W-4.5Ni-1.0Fe-1.5%Co) were mechanically alloyed in a tumbler rod mill for 2 hrs. Mechanically alloyed powders were liquid phase sintered at 1500oC for 90 min in vacuum. The sintered materials were heated up to 1150-1200oC in vacuum atmosphere, followed by quenching in water to suppress the impurity segregated at grain boundary. The sintered materials were subjected to cold-working by swaging from 8-30% reduction in area. The swaged specimens were age-hardened at 700oC. Full characterization for both the elemental powders and the sintered tungsten alloys were performed using optical microscopy, SEM analysis, EDS quantitative analysis, X-ray diffraction, hardness and compression testing. This paper will discuss the effects of the elemental powders characterization and the liquid phase sintering parameters on the microstructure and strength of these three tungsten heavy alloys.

Sign in / Sign up

Export Citation Format

Share Document