Effect of Nb on microstructure and intergranular corrosion sensitivity of 00Cr21Ni6Mn9N stainless steel

doi:10.13251/j.issn.0254-6051.2022.09.041

Abstract

Abstract: In order to study the effect of Nb on microstructure and intergranular corrosion resistance of 00Cr21Ni6Mn9N stainless steel after solution treatment, the 00Cr21Ni6Mn9N stainless steel with 0.057%Nb and without Nb were solution treated at 950, 1000, 1050, 1100, 1150 and 1200 ℃ for 1 h, respectively, and the microstructure was observed. The results show that when the solution temperature is 950-1200 ℃, the grain size of the 00Cr21Ni6Mn9N stainless steel increases with the increase of the solution temperature. The addition of Nb promotes the appearance of mixed crystal structure in the 00Cr21Ni6Mn9N stainless steel and increases its complete recrystallization temperature. The tested steel without Nb can obtain a uniform grain size after solid solution above 1000 ℃, while the tested steel with 0.057%Nb needs to be above 1100 ℃ to obtain a uniform structure, and its size is slightly larger than that of the steel without Nb at 1000 ℃ completely recrystallized grain. With the increase of solution temperature and the growth of grain size, the content of the precipitated Z phase decreases, and the grain interface energy decreases. After solution treatment at 1150 ℃ and 1200 ℃ for 1 h, the grain refinement effect of Nb and the degree of grain growth caused by the increase of temperature become no longer obvious. Both steels have lower intergranular corrosion susceptibility, while the reactivation rate R_a of the 00Cr21Ni6Mn9N stainless steel with 0.057%Nb is further lower than that of the steel without Nb.

Key words: 00Cr21Ni6Mn9N stainless steel, Nb microalloying, solution treatment, intergranular corrosion

CLC Number:

TG142.1⁺3

Yan Zhikun, Chen Haitao, Lang Yuping, Qu Huapeng, Feng Hanqiu, Liu Rongpei. Effect of Nb on microstructure and intergranular corrosion sensitivity of 00Cr21Ni6Mn9N stainless steel[J]. Heat Treatment of Metals, 2022, 47(9): 240-244.

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