Abstract
High velocity solid particle erosion may cause severe
damage and high wear rates in materials used for
wear protection. An experimental work on the behavior of
wear resistant steels, including three highstrength
martensitic alloys and a carbide-reinforced metal matrix
composite, was performed in high
rate single impact conditions. Characterization of the
mechanical behavior of the materials at high strain
rates was conducted using the Hopkinson Split Bar
technique to identify the effects of strain rate on
strain hardening and the prevailing failure mechanisms.
The high velocity impact experiments using
spherical projectiles were carried out at various impact
angles and projectile velocities. The effects of
impact energy and impact angle were studied and
discussed. Wear was analyzed as volume loss from the
surface, but it was also presented in a more precise way
by taking into account the actual energy spent on
the plastic deformation and wear. In-situ high speed
photography and post impact characterization of
the impact craters were used to reveal the prevailing
failure and wear mechanisms. Depending on the
impact angle and impact energy, different wear mechanisms
of plastic deformation, cutting, shear
banding and fracture were identified. The martensitic
steels exhibited adiabatic shear banding in the
microstructure at high strain rates and impact
velocities, which may accelerate the wear. The carbide
reinforced steel was found susceptible to catastrophic
fracturing especially at high impact angles.
Original language | English |
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Pages (from-to) | 114-127 |
Journal | International Journal of Impact Engineering |
Volume | 78 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- high strength steel
- impact wear
- adiabatic shear band
- high strain rate
- ProperPart
- ProperTune