Effect of Solution Temperature on Microstructure and Properties of Economical Duplex Stainless Steel
XIANG Hongliang1,2, LIU Chunyu1, DENG Liping1, ZHANG Wei3, REN Jianbin4
1 School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108 2 Jinjiang Science and Education Park of Fuzhou University, Jinjiang 362200 3 Baosteel Technology Center, Shanghai 201900 4 Baosteel-desheng Co., Ltd., Luoyuan 350600
Abstract: The effect of solution temperatures (1 000 ℃, 1 050 ℃, 1 100 ℃, 1 150 ℃, 1 200 ℃) on the microstructure, mechanical properties and corrosion resistance of NSSC 2120 duplex stainless steel has been investigated by OM, SEM, tensile and electrochemical experiments. The results showed that, as the temperature increased from 1 000 ℃ to 1 050 ℃, the strip or needle-shaped secondary austenite developed into ferrite, improving the tensile strength and corrosion resistance of NSSC 2120 duplex stainless steel. When the solution temperature went up to 1 150 ℃, both the increment of ferrite content and the tiny uniform austenite induced the tensile strength to reach a peak (632.5 MPa). As the dominant factor, the austenite resulted in a minimum corrosion current density of 2.247×10-6 μA·cm-2. When the solution temperature rised to 1 200 ℃, although the ratio of the two phases is close to 1∶1, the tensile strength and corrosion resistance decrease significantly. This is attributed to the austenite sharpening. Compared with the economical duplex stainless steel LDX 2101 and SUS 304 austenitic stainless steel, NSSC steel is excellent in the respect of the cost, the mechanical properties and pitting corrosion resistance.
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