scholarly journals Effect of tungsten particle shape on dynamic deformation and fracture behavior of tungsten heavy alloys

1998 ◽  
Vol 29 (13) ◽  
pp. 1057-1069 ◽  
Author(s):  
Dong-Kuk Kim ◽  
Sunghak Lee ◽  
Heung-Sub Song
Keyword(s):  
Particle Shape ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Tungsten Particle ◽  
Heavy Alloys ◽  
Deformation And Fracture ◽  
Tungsten Heavy Alloys

scholarly journals Effect of surface carburization on dynamic deformation and fracture of tungsten heavy alloys

1999 ◽  
Vol 30 (8) ◽  
pp. 2027-2035 ◽  
Author(s):  
Sug-Woo Jung ◽  
Suk-Joong L. Kang ◽  
Dong-Kuk Kim ◽  
Sunghak Lee ◽  
Joon-Woong Noh
Keyword(s):  
Dynamic Deformation ◽  
Heavy Alloys ◽  
Deformation And Fracture ◽  
Tungsten Heavy Alloys ◽  
Effect Of Surface

Dynamic Deformation and Fracture Behavior of Zr-Based Bulk Metallic Glasses

2007 ◽  
Vol 345-346 ◽  
pp. 629-632
Author(s):  
Dong Geun Lee ◽  
Yang Gon Kim ◽  
Byoung Chul Hwang ◽  
Sung Hak Lee ◽  
Nack J. Kim
Keyword(s):  
Compressive Stress ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Dynamic Properties ◽  
Shear Bands ◽  
Total Strain ◽  
Maximum Compressive Stress ◽  
Amorphous Phases ◽  
Deformation And Fracture ◽  
Dynamic Compressive Test

Dynamic deformation and fracture behavior of Zr-based bulk metallic glass (BMG) and BMG composite containing dendritic β phases was investigated in this study. Dynamic compressive test results indicated that both maximum compressive stress and total strain of the BMG and BMG composite decreased with increasing test temperature because shear bands could propagate rapidly as the adiabatic heating effect was added at high temperatures. Above the glass transition temperature, total strain decreased more abruptly due to crystallization of amorphous phases. Maximum compressive stress and total strain of the BMG composite were higher than those of the BMG because β phases played a role in forming multiple shear bands. The BMG composite having more excellent dynamic properties than the BMG can be more reliably applied to the structures or parts requiring dynamic properties.

scholarly journals Recent Progress in Processing of Tungsten Heavy Alloys

2014 ◽  
Vol 2014 ◽  
pp. 1-22 ◽  
Author(s):  
Y. Şahin
Keyword(s):  
Microwave Sintering ◽  
High Energy ◽  
Electrical Contacts ◽  
Matrix Composition ◽  
Powder Injection ◽  
Tungsten Particle ◽  
Two Phase ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys ◽  
Interface Bonding Strength

Tungsten heavy alloys (WHAs) belong to a group of two-phase composites, based on W-Ni-Cu and W-Ni-Fe alloys. Due to their combinations of high density, strength, and ductility, WHAs are used as radiation shields, vibration dampers, kinetic energy penetrators and heavy-duty electrical contacts. This paper presents recent progresses in processing, microstructure, and mechanical properties of WHAs. Various processing techniques for the fabrication of WHAs such as conventional powder metallurgy (PM), advent of powder injection molding (PIM), high-energy ball milling (MA), microwave sintering (MW), and spark-plasma sintering (SPS) are reviewed for alloys. This review reveals that key factors affecting the performance of WHAs are the microstructural factors such as tungsten and matrix composition, chemistry, shape, size and distributions of tungsten particles in matrix, and interface-bonding strength between the tungsten particle and matrix in addition to processing factors. SPS approach has a better performance than those of others, followed by extrusion process. Moreover, deformation behaviors of WHA penetrator and depleted uranium (DU) Ti alloy impacting at normal incidence both rigid and thick mild steel target are studied and modelled as elastic thermoviscoplastic. Height of the mushroomed region is smaller for α=0.3 and it forms sooner in each penetrator as compared to that for α=0.2.

scholarly journals Control of surface carburization and improvement of dynamic fracture behavior in tungsten heavy alloys

2002 ◽  
Vol 33 (4) ◽  
pp. 1213-1219 ◽  
Author(s):  
Sug-Woo Jung ◽  
Suk-Joong L. Kang ◽  
Sunghak Lee ◽  
Eun-Pyokim ◽  
Joon-Woong Noh ◽  
...  
Keyword(s):  
Dynamic Fracture ◽  
Fracture Behavior ◽  
Heavy Alloys ◽  
Tungsten Heavy Alloys

DYNAMIC DEFORMATION AND FRACTURE BEHAVIOR OF ULTRA-FINE-GRAINED DUAL PHASE STEELS FABRICATED BY EQUAL CHANNEL ANGULAR PRESSING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1159-1164
Author(s):  
YANG GON KIM ◽  
BYOUNGCHUL HWANG ◽  
SUNGHAK LEE ◽  
DONG HYUK SHIN
Keyword(s):  
Equal Channel Angular Pressing ◽  
Fracture Behavior ◽  
Dynamic Deformation ◽  
Maximum Shear Stress ◽  
Annealed Specimen ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Fine Grained ◽  
Angular Pressing ◽  
Deformation And Fracture

In this study, dynamic deformation and fracture behavior of ultra-fine-grained dual phase steels fabricated by equal channel angular pressing (ECAP) was compared with that of conventionally annealed ultra-fine-grained steels. In the ECAPed conventionally annealed specimen, pearlites were decomposed, and the ferrite grain size increased up to 0.5 μm. The intercritically annealed specimen consisted of dual phases of equiaxed ferrites and blocky martensites (volume fraction; 35%, size; 1 μm). The dynamic torsional test results indicated that maximum shear stress of the annealed specimens was lower than that of the as-pressed specimen, but fracture shear strain was higher. These results suggested that annealing or promoting dual phase microstructures of the ECAPed specimens could be a good way to increase the fracture resistance under dynamic loading, as it reduced or prevented the formation of adiabatic shear bands or voids. In particular, the ECAPed ultra-fine-grained dual phase steel can be more reliably used under dynamic conditions since it overcomes the shortcomings of reduced strain hardenability, ductility, and dynamic properties.

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