Microstructure and mechanical properties of a rotary friction welded tungsten heavy alloy
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Ramachandran Damodaram
Abstract
Tungsten heavy alloys (WHAs) are widely used in many aerospace and defence applications such as radiation shields, kinetic energy penetrators etc. In the current work, attempts were made to join WHA rods (8 mm in diameter) using rotary friction welding techniques. The WHA rods were prepared via conventional liquid phase sintering and had a two phase microstructure containing tungsten particles of spherical shape and surrounded by a solid solution matrix of Fe, Co and Ni. Rotary friction welding process parameters were successfully optimized and a sound weld with a narrow weld interface without any defects was obtained. The weld interface was found to be of a uniform width of around 150 μm throughout the weld interface and showed very fine fragmented tungsten particles with a refined matrix phase. Moreover, the thermomechanically affected zone (TMAZ) elongated tungsten particles were clearly seen to react normally to the compressive force direction. Further, the heat-affected zone width was so narrow that it was not detected in the current study. Microhardness at the interface showed increased hardness when compared with the base material indicating that the microstructural refinement occurred during friction welding. Tensile tests carried out at room temperature as per ASTM-E8, showed lower strength and ductility when compared with the base material (tested along the hot-working direction). The fractography of the fractured surface of the base material and weld sample confirmed that the ductile mode of fracture had occurred.
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© 2019, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Improved stress concentration factors for circular shafts for uniaxial and combined loading
- Constitutive modeling for high temperature compressive deformation of non-oriented electrical steel
- Microstructure and mechanical properties of a rotary friction welded tungsten heavy alloy
- Laser speckle photometry – Optical sensor systems for condition and process monitoring
- Bending behavior of sandwich structures with different fiber facing types and extremely low-density foam cores
- Effects of specimen dimensions and impact energy on energy absorption and damage of glass/epoxy composite plates
- Wear behavior of sansevieria cylindrica and E-glass reinforced polyester composites
- Synergistic effects of chemical finishing processes on comfort characteristics of micro-modal and lyocell knitted fabrics
- Inspection of defects in CFRP by improved magnetic induction tomography
- Effects of the drill flute number on drilling of a casted AZ91 magnesium alloy
- Limit load evaluation of inlet pigtail pipe bends with ovality under in-plane bending
- Synthesis of graphene oxide with superhydrophilicity and well-defined sheet size distribution
- Effects of induction hardened surface depth on the dynamic behavior of rotating shaft systems
- Tool condition monitoring in the milling process with vegetable based cutting fluids using vibration signatures
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Improved stress concentration factors for circular shafts for uniaxial and combined loading
- Constitutive modeling for high temperature compressive deformation of non-oriented electrical steel
- Microstructure and mechanical properties of a rotary friction welded tungsten heavy alloy
- Laser speckle photometry – Optical sensor systems for condition and process monitoring
- Bending behavior of sandwich structures with different fiber facing types and extremely low-density foam cores
- Effects of specimen dimensions and impact energy on energy absorption and damage of glass/epoxy composite plates
- Wear behavior of sansevieria cylindrica and E-glass reinforced polyester composites
- Synergistic effects of chemical finishing processes on comfort characteristics of micro-modal and lyocell knitted fabrics
- Inspection of defects in CFRP by improved magnetic induction tomography
- Effects of the drill flute number on drilling of a casted AZ91 magnesium alloy
- Limit load evaluation of inlet pigtail pipe bends with ovality under in-plane bending
- Synthesis of graphene oxide with superhydrophilicity and well-defined sheet size distribution
- Effects of induction hardened surface depth on the dynamic behavior of rotating shaft systems
- Tool condition monitoring in the milling process with vegetable based cutting fluids using vibration signatures
