قائمة الطعام
The measurement and analysis of magnetisation curves, including anhysteretic and initial curves of heterogeneous and anisotropic materials (sintered tungsten carbides of constant grain size ...
This study deals with thorough investigations of the effects of sintering temperature, sintering time, and subsequent quenching in water on the structures …
Рurpose of this work was to optimize the process of obtaining powder materials for the production of carbide cutting tools by electrodispersing metal waste of TN20 alloy in water.Methods. To carry out the planned studies, waste of sintered tungsten-free hard alloy of the TN20 brand was selected. Distilled water was used as the working …
Spark plasma sintering (SPS) is a newly developed sintering method, which enables a powder compact to be sintered by Joule heat by high pulsed electric current through the compact. During the past ...
However, its application for heating of paramagnetic workpieces is still a challenge. The presented study focuses on design and optimization of induction heating for a pre-sintered WNiCo tungsten heavy alloy billet intended to be subjected to plastic deformation via warm rotary swaging.
Tungsten alloying improves its chemical, physical, and mechanical properties at low and high temperatures. Some essential tungsten-based alloys are …
Machining and Fabrication. Once sintered, the copper-tungsten material can be machined into the desired shape and size using traditional machining techniques such as turning, milling, and grinding. Fabrication steps may also include drilling, cutting, and other operations to create the final product. 5. Heat Treatment.
This study can be used to guide the process optimization design. Combined with numerical simulation calculation, the sintering parameters with low …
The first experiment dealt with the stage I long-range migration of tungsten self interstitial atoms (SIAs) in high purity tungsten of resistivity ratio, R = 24,000 (R = rho/sub 300//rho/sub 4/./sub 2/, where rho/sub 300/ and rho/sub 4/./sub 2/ are the room temperature and 0/sup 0/C resistivities).
The as-sintered tungsten alloy possesses a high relative density (98.6%), ultrafine grain size (271 nm) and high dislocation density (2.6 × 1016 m−2), which results in excellent properties such ...
The as-sintered tungsten alloy possesses a high relative density (98.6%), ultrafine grain size (271 nm) and high dislocation density (2.6 × 1016 m−2), which results in excellent properties such ...
Tungsten alloy has a density of 16.5~19.0 g/cm 3 at room temperature [1] and is a high-density alloy with high hardness, high strength, high temperature resistance, small heat deformation, strong ...
This study deals with thorough investigations of the effects of sintering temperature, sintering time, and subsequent quenching in water on the structures and mechanical properties of a 93W6Ni1Co tungsten heavy alloy. The results showed that sintering at temperatures of or above 1525 °C leads to formation of structures featuring …
The process of microdrilling sintered tungsten–copper composite material was selected due to its excellent mechanical, thermal and electrical properties. ... (Cuba), where he is currently working as a Full Professor. His research interests focus on the modeling and optimization of machining process and applied artificial intelligence. He …
The densification kinetics and grain growth behavior of an undoped tungsten powder during spark plasma sintering (SPS) were investigated under the pressure of 40 MPa and constant heating rate of 100 °C min − 1.Two stages of the sintering process were clearly identified: densification without grain growth at the low temperatures …
The following characteristics of spark plasma-sintered tungsten compacts were studied: composition (especially carbon and oxygen content), porosity, mechanical properties (hardness and fracture strength), and thermal diffusivity. ... In Ref., optimization of W sintering was performed by introducing a holding step at intermediate temperature ...
The dimensional stability and nonuniformity in the properties observed frequently in sin- tered alloys can be controlled by optimization of the sintering process and elimination …
Roughness in Hard Turning of Sintered Tungsten Carbide (WC 25wt% Co) Using CBN Tool . ... FCCD, optimization . I. INTRODUCTION In recent years, super-hard material (as sintered
@article{Chen2024ANP, title={A novel performance optimization study in additively manufactured tungsten-5 wt.%Rhenium alloys reinforced with dilute carbon}, author={Jinhan Chen and Xiaoyang Wang and Kailun Li and Mingshen Li and Xiaoqian Fu and Rong Hu and Shubo Zhang and Weiyi Wang and Wenjing Zhang and Qian Yu and …
Based on the derived objective function, an optimization algorithm to minimize grain size under the given target density was developed. For example using our nanoscale WC-Co, grain size of 332 nm was the minimum size when the compaction pressure of 565 MPa and 97% of sintered density were the processing constraints. …
Typical application of FAST/SPS modeling is the optimization of tooling design aiming at a desired temperature distribution within the sintered part. The …
Optimization of process parameter of sintered powder metallurgical TiC reinforced tungsten matrix composites - ScienceDirect. Metal Powder Report. Volume …
The presented study focuses on design and optimization of induction heating for a pre-sintered WNiCo tungsten heavy alloy billet intended to be subjected to plastic deformation via warm rotary swaging. Firstly, induction heating to the initial deformation temperature of 900 °C is simulated via two different computational software …
Tungsten sintered at 1700 °C shows the highest displacement and maximum depth (428 nm) while tungsten sintered at 2000 °C shows the lowest depth (342 nm). In general, the left shift of the load–displacement curve usually indicates that the pressure head is subject to greater resistance . With the increasing of sintering temperature, the ...
C sintered piece, the tungsten agglomerates surrounded by the NiCo matrix in which can clearly be seen, too. Both the 1525 and 1550 C samples exhibited no residual porosity .
cutting force, optimization of the roughness is inv estigated . based on the tools, the workpieces, and processing condi- ... This study targets sintered tungsten carbide (WC-Co), for which it is ...
In order to improve the performance and properties of these alloys the optimization. ... XRD patterns of the obtained ODS tungsten heavy alloys sintered materials, where: (a) W-Ni-Fe-Co-T iO. 2 ...
Based on the application of elliptical vibration cutting method to precision machining of hard and brittle materials and material softening technology through laser heating, a novel composite cutting technique, laser heating and ultrasonic elliptical vibration assisted cutting, is applied to process sintered tungsten carbide. The simulation of the orthogonal cutting …
Tungsten heavy alloys are optimized for mechanical properties with 93 wt % tungsten. •. Sintering densification and distortion depend on the gravitational environment. •. Mechanical properties exhibit upper bounds. •. Computer predictions of final …
For the first time this report demonstrates that the micro milling of tungsten–copper sintered composite materials with end mills is possible if suitable machine tool equipment is available and the cutting speed as well as the feed per tooth are adjusted correctly. Furthermore major improvements of surface roughness and an …
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