Abstract：The effect of different solution temperatures on microstructure and mechanical properties of a new composition 17Cr lean stainless steel was studied by means of room temperature tensile tests, microstructure observation and X-ray diffraction, etc. The best heat treatment temperature was selected, and the effect of solution temperature on austenite stability of this type of stainless steel was also clarified. The results show that the 17Cr stainless steel will upper and lower yield at 900-1 000 ℃, the TRIP effect will not occur at 1 200 ℃, and the optimum solution treatment temperature range is 1 050-1 150 ℃. The specimens show three-phase structure of ferrite, austenite and martensite with different solution temperatures. With the increase of solution temperature, the thermomechanical stability of austenite first increases and then decreases, which shows the incidence rate of quenched martensite phase transformation first reduces and then grows. The mechanical stability of austenite increases with the increase of solution temperature, which shows that the TRIP effect slows down, the tensile strength decreases and the elongation increases. Analysis of the tensile specimen fracture shows that martensite is exhibiting deconvolution fracture, while ferrite hinders crack expansion through ductile fracture. This study provides new idea and theoretical basis for the composition and microstructure design of economical duplex stainless steel.
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2023, Vol. 33 
