| Abstract Scope |
Microstructure evolution and tensile properties of large dimensional 316L stainless steel after rolling with different thickness reduction were characterized in details. The results showed that the steel consisted micro-nanocrystalline austenite phase and some ferrite phase, nanocrystalline austenite phase size decreased from 100~800nm to 20~100nm and dispersed more uniformly in the microcrystalline austenite phase in the 316L steel with the thickness reduction, and volume fraction decreased from 63% to 27%, whereas tensile strength increased from 682MPa to 985MPa, yield strength increased from 550MPa to 800MPa, intergranular corrosion rate decreased from 2.16g/(m2*h) to 0.46 g/(m2*h), elongation decreased from 16% to 20%. Strength and intergranular corrosion properties increased much, whereas the elongation increased a little. When the thickness reduction was 70%, the tensile strength, yield strength and elongation was about 985MPa, 800MPa and 20%, respectively, the combination of strength and elongation was the optimum in the reported value of stainless steels. |