CC BY
33HiLASE-I-18
Microstructural issues of materials properties after laser shock peening
V. Vasudevan1
University of Cincinnati, Mechancialand Materials Engineering, Cincinnati, USA
This talk will mainly focus on the nature of the gradient microstructure generated by laser shock peening (LSP) of metals with and without an ablative coating. The characteristics of the near-surface microstructures that can result as studied by EBSD/OIM, XRD and TEM, including dislocation and crystallite structures, texture, strain-induced martensite, surface oxides, nanostructures, etc, their dependence on the process variables and thermal stability will be described with examples from a variety of alloys such as IN718, IN718+, Ti-6Al-4V, Ti6242, alloy 600, 304 stainless steel, Al 7075 and Al 5083. Local property changes measured by nanoindentation, microhardness and micropillar compression tests will be reported. The results showing the relationship between process parameters and the near-surface microstructure and thermal stability of both, mechanical properties, including hardening and fatigue, corrosion and stress corrosion cracking behavior, will be presented and discussed.
