固溶时效对1Cr21Ni5Ti双相不锈钢组织的影响

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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 ℃.

Key words： 1Cr21Ni5Ti duplex stainless steel solid solution and aging treatment microstructure evolution σ phase precipitation

Published: 16 July 2021

CLC number:

TG156

Fund:supported by High-end CNC Machine Tools and Basic Manufacturing Equipment Science and Technology Major Special Advanced Forming and Welding Common Key Technology Innovation Platform Construction (2018ZX04044001).

About author:: Aoming Yuan, obtained his master's degree in mate-rials engineering from University of Science and Technology Beijing in January 2020. After graduation, he served in Beijing National Innovation Institute of Lightweight Ltd till now. His research work mainly focuses on the state key development of advanced metal materials, superplastic forming/diffusion bonding technology, and carries out the basic theory and application research on advanced processing technology and microstructure and properties control of titanium alloy and aluminum alloy.Xueping Ren obtained her D.E. degree from Harbin Institute of Technology and served in School of Materials Science and Engineering, USTB till now. He is currently a professor and doctoral supervisor enjoying special go-vernment allowances. He has published more than 180 journal papers, applied 10 national invention patents. His team's research interests are material plastic proce-ssing theory, special materials and their processing, material forming process design and control.

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Cite this article:

YUAN Aoming,REN Xueping. Effect of Solid Solution and Aging on the Microstructure of 1Cr21Ni5Ti Duplex Stainless Steel[J]. Materials Reports, 2021, 35(Z1): 443-446.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/443

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