Abstract
The effects of laser-shock processing (LSP) on the microstructure, hardness, and residual stress of Hadfield manganese (1 pct C and 14 pct Mn) steels were studied. Laser-shock processing was performed using a Nd: glass phosphate laser with 600 ps pulse width and up to 120 J/pulse energy at power density above 1012 W/cm2. The effects of cold rolling and shot peening were also studied for comparison. Laser-shock processing caused extensive formation of ε hexagonal close-packed (hep) martensite (35 vol pct), producing up to a 130 pct increase of surface hardness. The surface hardness increase was 40 to 60 pct for the shot-peened specimen and about 60 pct for the cold-rolled specimen. The LSP strengthening effect on Hadfield steel was attributed to the combined effects of the partial dislocation/stacking fault arrays and the grain refinement due to the presence of the ε-hcp martensite. For the cold-rolled and shot-peened specimens, the strengthening was a result of ε-hcp martensite and twins with dislocation effects, respectively. Shot peening resulted in a relatively higher compressive residual stress throughout the specimen than LSP.
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Chu, J.P., Rigsbee, J.M., Banaś, G. et al. Effects of laser-shock processing on the microstructure and surface mechanical properties of hadfield manganese steel. Metall Mater Trans A 26, 1507–1517 (1995). https://doi.org/10.1007/BF02647602
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DOI: https://doi.org/10.1007/BF02647602