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• W4293721198 endingPage "143896" @default.
• W4293721198 startingPage "143896" @default.
• W4293721198 abstract "Stainless steel 316L alloy with a complete austenite phase was manufactured using the Laser Engineered Net Shaping (LENS) technique. The microstructure of LENS-316L from the sub-millimeter to nanometer domains was analyzed using multi-scale characterization methods. The dynamic behavior of LENS-316L was studied by the Split Hopkinson Pressure Bar (SHPB) test. In this study, the dominating strengthening mechanism of the microstructure in LENS-316L was the dislocation strengthening mechanism, providing approximately 153 MPa. The molten pool deforms significantly after the material was dynamically compressed. When the strain rate reached 5000 s −1 , the material exhibited an adiabatic shear phenomenon and formed adiabatic shear bands. The width of the shear band decreased with the increase in the strain rate. When the strain rate increases from 3000 s −1 to 4000 s −1 , the dislocation density increases, the number of twins increases, and the twin thickness decreases. The effect of varying strain rates (3000, 4000, 5000, 6000 s −1 ) and varying temperatures (20, 150, 272, 450, 620 °C), on the stress–strain curves of the material were studied through the SHPB test. Additionally, the traditional Johnson–Cook (JC) constitutive model was modified. The modified constitutive model considers the effects of the strain rate and temperature softening coefficients in the strain hardening stage to predict the mechanical behavior of LENS-316L at high temperature and strain rates. Model predictions were in agreement with the experimental data. This study provides important insights for applying the LENS-316L complex construction in a dynamic load impact environment. • The microstructure strengthening mechanism of 316L manufactured by LENS technology is revealed. • The multi-scale research method is used to analyze the effect of strain rate on the microstructure evolution of LENS-316L. • The effects of high temperature and high strain rate on the dynamic mechanical properties of LENS-316L were studied. • A new constitutive model is established to predict the dynamic mechanical behavior of LENS-316L." @default.
• W4293721198 created "2022-08-31" @default.
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• W4293721198 date "2022-10-01" @default.
• W4293721198 modified "2023-10-15" @default.
• W4293721198 title "Mechanical properties and microstructure evolution of additive manufactured 316L stainless steel under dynamic loading" @default.
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• W4293721198 doi "https://doi.org/10.1016/j.msea.2022.143896" @default.
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