Micro Structural Evolution of a 93 Wt% Tungsten Heavy Alloy: A Quenching Study to Understand the Evolution of Contiguity, Connectivity with Sintering Temperature and Time

2015 ◽  
Vol 04 (01) ◽  
Author(s):  
Bollina R Suri P
Keyword(s):  
Sintering Temperature ◽  
Structural Evolution ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy

scholarly journals Effects of Sintering Conditions on Structures and Properties of Sintered Tungsten Heavy Alloy

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2338 ◽  
Author(s):  
Lenka Kunčická ◽  
Radim Kocich ◽  
Zuzana Klečková
Keyword(s):  
Sintering Temperature ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Fabrication Technology ◽  
Sintering Time ◽  
Heavy Alloys ◽  
Structures And Properties ◽  
Processing Step ◽  
Tungsten Heavy Alloys ◽  
Subsequent Quenching

Probably the most advantageous fabrication technology of tungsten heavy alloys enabling the achievement of required performance combines methods of powder metallurgy and processing by intensive plastic deformation. Since the selected processing conditions applied for each individual processing step affect the final structures and properties of the alloys, their optimization is of the utmost importance. 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 W agglomerates surrounded by the NiCo matrix. The sintering time has non-negligible effects on the microhardness of the sintered samples as it affects the diffusion and structure softening phenomena. Implementation of quenching to the processing technology results in excellent plasticity of the green sintered and quenched pieces of almost 20%, while maintaining the strength of more than 1000 MPa.

Microstructure and mechanical properties of a rotary friction welded tungsten heavy alloy

2019 ◽  
Vol 61 (3) ◽  
pp. 209-212
Author(s):  
Ramachandran Damodaram ◽  
Gangaraju Manogna Karthik ◽  
Sree Vardhan Lalam
Keyword(s):  
Mechanical Properties ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Microstructure And Mechanical Properties

Brazing of Tungsten Heavy Alloy and Fe-Ni-Co Based Superalloy by a Novel Cu-Ti Based Amorphous Filler

2021 ◽  
Author(s):  
Yuxin Xu ◽  
Xiaoming Qiu ◽  
Jinlong Su ◽  
Suyu Wang ◽  
Xiaohui Zhao ◽  
...  
Keyword(s):  
Heavy Alloy ◽  
Tungsten Heavy Alloy

Failure Mechanism of Tungsten Heavy Alloy for Mould

2011 ◽  
Vol 341-342 ◽  
pp. 432-435
Author(s):  
Wei Huang ◽  
Ya Feng Li ◽  
Kai Wen Tian ◽  
Fu Jun Shang ◽  
Yong Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Failure Mechanism ◽  
Matrix Composite ◽  
External Load ◽  
High Strength ◽  
Strength Level ◽  
Heavy Alloy ◽  
Theoretical Strength ◽  
Tungsten Heavy Alloy ◽  
The Real

The failure mechanism of tungsten matrix composite was studied with microscale numerical simulation. The results show that high strength tungsten particles are the real loading elements of composite, its strength level embodies the whole property of the composite to some extent. The real stress in tungsten particles is much higher than the external load, so failure may take place when the external load is less than the theoretical strength of tungsten particles.

Comparative studies of the constitutive models for tungsten heavy alloy (95W-3.5Ni-1.5Fe) at high strain rates

2021 ◽  
pp. 095440622110451
Author(s):  
Xiuwen Lai ◽  
Zhanjiang Wang ◽  
Na Qin
Keyword(s):  
Threshold Stress ◽  
Dynamic Compression ◽  
Constitutive Models ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Strain Rates ◽  
Stress Model ◽  
Static Compression ◽  
Mechanical Threshold ◽  
Wide Range

The plastic behaviors’ description of a tungsten heavy alloy (95W-3.5Ni-1.5Fe) at temperatures of 298–773 K and strain rates of 0.001–11,000 s−1 is systematically studied based on four constitutive models, that is, Zerilli-Armstrong model, modified Zerilli-Armstrong model, Mechanical Threshold Stress model, and modified Mechanical Threshold Stress model. The quasi-static compression experiments using an electronic universal testing machine and the dynamic compression experiments using a split Hopkinson pressure bar apparatus are employed to obtain the true stress–strain curves at a total of three temperatures (298 K, 573 K, and 773 K) and a wide range of strain rates (0.001–11,000 s−1). The parameters of the four constitutive models are obtained by the above fundamental experimental data and Grey Wolf Optimizer. The correlation coefficient and average absolute relative error are used to evaluate the predicted performance of these models. Modified Mechanical Threshold Stress model is found to have the highest predicted performance in describing the flow stress of the 95W-3.5Ni-1.5Fe alloy. Eventually, two compression experiments whose loading conditions are not in the fundamental experiments are conducted to validate the four models.

scholarly journals Fabrication of tungsten heavy alloy long rods by warm powder extrusion and vacuum sintering

2019 ◽  
Vol 8 (2) ◽  
pp. 2209-2215
Author(s):  
Mai Essam ◽  
Ayman Elsayed ◽  
Ahmed Shash ◽  
Mahmoud Adly
Keyword(s):  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Vacuum Sintering
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