Effects of laser-shock processing on the microstructure and surface mechanical properties of hadfield manganese steel |
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| Authors: | J P Chu J M Rigsbee G Banaś F V Lawrence H E Elsayed-Ali |
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| Affiliation: | (1) Institute of Materials Engineering, National Taiwan Ocean University, Keelung, Taiwan, Republic of China;(2) Department of Materials Science and Engineering, University of Alabama at Birmingham, 35294-4461 Birmingham, AL;(3) Department of Civil Engineering, University of Illinois at Urbana-Champaign, 61801 Urbana, IL;(4) Department of Electrical and Computer Engineering, Old Dominion University, 23529 Norfolk, VA |
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| 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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