International Conference on Laser Peening and Related Phenomena

The heat-resistant steel after aluminized was treated by laser shock processing (LSP) with high power Nd:YAG laser, and then was tensile tested at 400 . The effects of the high °C -temperature behavior after LSP were analyzed from residual stress and fracture organization. The results showed that the yield strength and tensile strength of heat-resistant steel after aluminized were improved obviously during the tensile testing at high temperature, and the High-temperature fatigue life of 00Cr12 with composite processing was enhanced vastly. Compared with the LSP, the High-temperature fatigue life of 00Cr12 heat-resistant steel by aluminizing and LSP had a larger increase. Fig-SEM of 00Cr12 heat-resistant steel after LSP at 400°C The SEM of 00Cr12 heat-resistant steel after LSP displayed the fatigue fracture section at 400 .The inclusion °C , shrinkage and other flaws of specimen internal (labeled for a circle) were seen clearly from (a), which were the originate of fatigue cracks. Due to flaws producing cracks, the cracks expanded from the middle region to substrate surface and internal, as indicated by the arrow. (b) was the high magnification image of (a) , a lot of spherical inclusions were found from specimen subsurface stratum at place labeled for a circle, (c) was the high magnification image of the circle at (a), and (d) showed the energy spectrum of Spectrum1. The energy spectrum analysis of Spectrum1 indicated that it was the oxide inclusions including rich Cr, this flaw could be the cracks originate.