Effects of residual porosity on the properties of tungsten carbide-cobalt hard alloys

1974 ◽  
Vol 13 (8) ◽  
pp. 670-673 ◽  
Author(s):  
N. I. Romanova ◽  
G. S. Kreimer ◽  
V. I. Tumanov
Keyword(s):  
Tungsten Carbide ◽  
Residual Porosity ◽  
Hard Alloys

scholarly journals Structure Formation of Polycarbide-Based TiC-VC(NbC)-WC/nano WC Hard Alloys

2019 ◽  
Vol 57 ◽  
pp. 35-40 ◽  
Author(s):  
Liudmyla Bodrova ◽  
Halyna Kramar ◽  
Yaroslav Kovalchuk ◽  
Sergiy Marynenko ◽  
Ihor Koval
Keyword(s):  
Chemical Composition ◽  
Tungsten Carbide ◽  
Optical Microscopy ◽  
Structure Formation ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Hard Alloys ◽  
Alloying Additions ◽  
The Core

The process of structure formation in the alloys of the system TiC-VC(NbC)-NiCr with the alloying additions of the fine or nano WC, depending on the chemical composition and sintering temperature using the optical microscopy, SEM and XRD analysis, is investigated in this paper. The core/rim structure alloys were found irrespective of the amount of tungsten carbide additions. The research suggests that the adding of nano WC causes decrease in carbide grains, redistribution of the elements in the core and rim, and decrease in sintering temperature by 50–100 °С. Tika pētīts struktūru veidošanas process sakausējumos TiC-VC(NbC)-NiCr ar smalku vai nano WC sakausējuma papildinājumiem atkarībā no ķīmiskā sastāva un saķepināšanas temperatūras, izmantojot optisko mikroskopiju, SEM un XRD analīzi. Centru/aptvērumu struktūras sakausējumi tika konstatēti neatkarīgi no volframa karbīda piedevu daudzuma. Pētījums liecina, ka nano WC pievienošana samazina karbīda graudus, elementu pārdali centros un aptvērumos, kā arī notiek saķepināšanās temperatūras samazināšanās par 50–100° С.

Influence of residual stresses on the static strength of hard alloys of the VK type [tungsten carbide-cobalt]

1975 ◽  
Vol 7 (9) ◽  
pp. 1105-1111 ◽  
Author(s):  
S. I. Spirina ◽  
B. M. Sverdlova ◽  
N. I. Spirina
Keyword(s):  
Residual Stresses ◽  
Tungsten Carbide ◽  
Static Strength ◽  
Hard Alloys

A Study on Grinding Tungsten Carbide with Ultrasonic Assisted

2013 ◽  
Vol 797 ◽  
pp. 374-381
Author(s):  
Pei Lum Tso ◽  
Chao Chun Tseng
Keyword(s):  
Tungsten Carbide ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Cutting Temperature ◽  
Limited Range ◽  
Machining Process ◽  
Grinding Wheel ◽  
Hard Alloys ◽  
Ultrasonic Assisted

In order to cope with high demanded industry requirements. The super-hard alloys such as Tungsten Carbide have been widely used in aerospace and defense industries. So far, the grinding operation is still the most popular machining process being used to cut these materials in shape. But, owing to the nature of these materials mechanical properties, always made it very difficult to grind as well as to cut. Nevertheless, the allowable grinding parameters are resisted to very limited range and always require use very expensive super abrasive grinding wheel. Recently, study by many researchers show that the ultrasonic assist grinding had the advantage of higher material removal rate, less cutting force and lower cutting temperature. In the mean time, the tool life had been improved greatly. In this study, the conventional GC grinding wheel was used in the experiments to study the material removal rate; grinding force; surface roughness as well as specific grinding energy with and without the ultrasonic assist. The results show that these difficult-to-cut materials can be ground easier with proper ultrasonic assist and low-priced grinding wheel.

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