Effect of annealing on microstructure and properties of a Fe-Cr-Al-Mn duplex stainless steel

doi:10.13251/j.issn.0254-6051.2021.06.007

Abstract

Abstract: A new type of resource-saving duplex stainless steel Fe-Cr-Al-Mn was designed, prepared, and hot rolled in the high temperature single-phase ferrite (α) region. The effects of different annealing processes on the microstructure, mechanical properties and corrosion resistance after cold-rolling were further studied. The results show that the coarse α-phase grains are broken and refined after the cold rolling. During the annealing process, austenite nucleates and grows at the ferrite grain boundaries. As the annealing time increases, the volume fraction of austenite gradually increases. With the increases of annealing temperature, the volume fraction of austenite decreases, both the elongation and the pitting corrosion resistance show a tendency to increase first and then decrease. After 800 ℃×4 h annealing, the phase ratio and grain size of ferrite and austenite are uniform, which results in excellent combination of strength, elongation and pitting resistance.

Key words: Fe-Cr-Al-Mn duplex stainless steel, annealing, microstructure, mechanical properties, corrosion resistance

CLC Number:

Chen Peng, Zhang Xiaoming, Pan Mingming. Effect of annealing on microstructure and properties of a Fe-Cr-Al-Mn duplex stainless steel[J]. Heat Treatment of Metals, 2021, 46(6): 31-35.

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