Laser shock deforming and induced microstructure evolution of austenitic stainless steel sheet
by Xinmin Luo, Chunzhi Yuan, Xudong Ren, Yongkang Zhang, Kangmin Chen
International Journal of Materials and Structural Integrity (IJMSI), Vol. 4, No. 1, 2010

Abstract: The black paint coated austenitic stainless steel sheet ASTM-204L was laser shock deformed by the Nd:YAG laser with the 1,054 nm output wave length and the 20 ns short pulse, when tap water was used as the confinement regime. The macro-deformation of the sheets was examined and the laser induced microstructures' evolution was observed and analysed with the thermo-field emission scanning electron microscope. The experimental results indicate that the plasma detonation wave acted on the sheets' surface upon laser shocking can produce designed deformation when the laser facular is 7 mm dia., the energy density 2 GW cm⁻². The microscopic morphology observation reveals that condensed plasma becomes a magma-like shell, which effectively guarantees the shocking effects of the laser beam due to the ethyl-silicate black paint coating and the confinement stratum. The macroscopic deformation mechanism belongs to the uniform plastic deformation in the thickness limit of the test material; however, in the microscopic mechanism, the twin deformation, slipping and stacking faults in austenite grains become dominant. The material grain boundaries have a negative effect on the plastic deformation of steel sheets upon laser shock processing.

Online publication date: Sun, 04-Apr-2010

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