Intergranular corrosion susceptibility of isothermally deformed 0Cr14Mn21NiN non-magnetic stainless steel

doi:10.13251/j.issn.0254-6051.2020.08.001

Abstract

Abstract: The equilibrium phase regions of carbide precipitation in the 0Cr14Mn21NiN non-magnetic stainless steel (NMSS) were calculated by Thermal-Calc software, and the result was verified by aging treatment experiment. The real non-equilibrium carbide precipitation behavior was researched after isothermal deformation (ITD) experiment with different parameters. The intergranular corrosion (IGC) susceptibility of ITD specimens was tested and compared by double loop electrochemical potential-dynamic reactivation (DL-EPR) method. The results show that the Thermal-Calc calculated equilibrium Cr₂₃C₆ precipitation temperature region is from 512 ℃ to 847 ℃, while the real region obtained from the aging experiment is from 720 ℃ to 940 ℃, indicating a distinction of approximately 200 ℃. When the total deformation is less than 20%, the lower temperature limit of non-equilibrium carbide precipitation of ITD specimens is descended to 625 ℃, and both the carbide nucleation and growth are accelerated after the ITD process. The DL-EPR results show that the IGC susceptibility of the 0Cr14Mn21NiN non-magnetic stainless steel is obviously increased after the ITD process due to the accelerated carbide precipitation.

Key words: non-magnetic stainless steel, isothermal deformation, intergranular corrosion, carbide

CLC Number:

TG156.2

Qu Huapeng, Wang Liwei, Feng Hanqiu, Peng Shengtong, Chen Haitao, Luo Dingxiang, Lang Yuping. Intergranular corrosion susceptibility of isothermally deformed 0Cr14Mn21NiN non-magnetic stainless steel[J]. Heat Treatment of Metals, 2020, 45(8): 1-6.

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