ժҪ A A new series of economical Mo-free duplex stainless steels 21��5Cr-3��5Ni-xW-0��2N (x=1��8-3��0, mass%) have been developed. The effects of W on mechanical properties and corrosion resistance were investigated, and the microstructures were analyzed by optical microscopy, X-ray diffraction, transmission electron microscopy and electron backscatter diffraction. The designed steels have a balanced ferrite-austenite relation and are free of sigma phase after solution treatment at 750-1300 �� for 30 min followed by water-quenching, whereas a small number of Cr23C6 precipitates were found after solution treatment at 750 ��. After solution treatment at 1050 ��, the steel with 1��8% (mass percent) W exhibits the highest room temperature tensile strength due to the strongest work hardening effect, while the steel with 3��0% (mass percent) W exhibits the highest fracture elongation owing to the transformation-induced plasticity (TRIP) effect. The ductile-brittle transition (DBT) and martensite transformation are respectively found in the ferrite and austenite, which deteriorates the impact properties of the steels with the increase of W content. The corrosion resistance of the designed steels is improved with the increase of W content. The pitting resistance of austenite is obviously better than that of ferrite for the designed alloys. Among the designed steels, the steel with 1��8% (mass percent) W is found to be an optimum steel with excellent comprehensive properties and lowest production cost.
Abstract��A A new series of economical Mo-free duplex stainless steels 21��5Cr-3��5Ni-xW-0��2N (x=1��8-3��0, mass%) have been developed. The effects of W on mechanical properties and corrosion resistance were investigated, and the microstructures were analyzed by optical microscopy, X-ray diffraction, transmission electron microscopy and electron backscatter diffraction. The designed steels have a balanced ferrite-austenite relation and are free of sigma phase after solution treatment at 750-1300 �� for 30 min followed by water-quenching, whereas a small number of Cr23C6 precipitates were found after solution treatment at 750 ��. After solution treatment at 1050 ��, the steel with 1��8% (mass percent) W exhibits the highest room temperature tensile strength due to the strongest work hardening effect, while the steel with 3��0% (mass percent) W exhibits the highest fracture elongation owing to the transformation-induced plasticity (TRIP) effect. The ductile-brittle transition (DBT) and martensite transformation are respectively found in the ferrite and austenite, which deteriorates the impact properties of the steels with the increase of W content. The corrosion resistance of the designed steels is improved with the increase of W content. The pitting resistance of austenite is obviously better than that of ferrite for the designed alloys. Among the designed steels, the steel with 1��8% (mass percent) W is found to be an optimum steel with excellent comprehensive properties and lowest production cost.
�ո�����: 2012-07-03
��������: 2014-01-16
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E-mail: xsxiao@mail.shu.edu.cn
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Zi-xing ZHANG,Qing-xuan RAN,Yu-lai XU,Xiao-jiang YU,Da-wei JIANG,Xue-shan XIAO. A New Series of Mo-free 21��5Cr-3��5Ni-xW-0��2N Economical Duplex Stainless Steels[J]. �й������ڿ���, 2014, 21(1): 69-75.
Zi-xing ZHANG,Qing-xuan RAN,Yu-lai XU,Xiao-jiang YU,Da-wei JIANG,Xue-shan XIAO. A New Series of Mo-free 21��5Cr-3��5Ni-xW-0��2N Economical Duplex Stainless Steels. Chinese Journal of Iron and Steel, 2014, 21(1): 69-75.
2014, Vol. 21 
