Abstract
As ultrafine grained (UFG) steels obtained by severe plastic deformation (SPD) are useful for structural purposes and micro devices, it is necessary to establish the relation of microstructure with wear and corrosion properties. Very few studies are available that correlate the microstructural changes and the mechanical properties of UFG steels to the degradation phenomena such as wear and corrosion. In present work a HSLA steel was severely deformed by warm (500°C) multiaxial forging (MAF) technique using up to nine strain steps. Submicron sized grain size was obtained after warm MAF. The hardness and strength improved significantly. The MAF processed UFG HSLA steel did not show any improvement in wear resistance. Low pull-off-work and fragmented nanosized pearlitic cementite particles were the two factors found responsible for it. The corrosion resistance of HSLA steel after warm MAF remained largely unaffected.
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