Effect of Solid Solution and Aging on the Microstructure of 1Cr21Ni5Ti Duplex Stainless Steel
YUAN Aoming1, REN Xueping2
1 Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China 2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: 1Cr21Ni5Ti duplex stainless steel was used as raw material to observe the microstructure and σ precipitated phase after solid solution at 1 000—1 350 ℃ for 30 min and aging at 650—1 000 ℃ for 1—1 440 min. The structure characteristics under different treatment conditions were described, and the σ phase precipitation TTP curve was drawn. The results show that, with the increase of the solid solution temperature, the ferrite content increases, the austenite content decreases, and the duplex stainless steel structure recrystallization and grain growth occur. The Cr and Ni elements in ferrite and austenite are homogenized, and the content difference in each phase is reduced. The σ phase preferentially nucleates at the boundary between ferrite and austenite. With the increase of the aging temperature and the extension of the aging time, the σ phase grows, coarsens and extends to the ferrite matrix; the longer the aging time, the more precipitated phases are; when the temperature reaches 750 ℃, the precipitation rate of σ phase is the fastest, and then decreases as the temperature increases. The precipitation temperature range of σ phase is 650—850 ℃, and the temperature of the nose tip is 750 ℃.
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