Effect of cold rolling and aging process on σ phase precipitation of 2205 duplex stainless steel

doi:10.13251/j.issn.0254-6051.2021.10.004

Abstract

Abstract: The 2205 duplex stainless steel after solution treatment at 1050 ℃ was treated by aging at 650-1000 ℃. The σ phase precipitation rule under different process conditions was observed by means of OM and SEM. TTP curves of σ phase precipitation were obtained to characterize the precipitation of σ phase. The results show that in the early stage of aging, the σ phase preferentially nucleates at the phase boundary of the two phases of austenite and ferrite. With the increase of aging temperature and the aging time, the σ phase grows, coarsens and extends to the ferrite matrix. The longer the aging time, the more precipitation phases. When the aging time is the same and the temperature reaches 850 ℃, the amount of precipitation reaches the maximum and then decreases with the increase of temperature. The precipitation temperature range of σ phase is 650-950 ℃, and the knee temperature is about 850 ℃. The increase in rolling deformation speeds up the precipitation of σ phase, but it does not affect the knee temperature of the precipitation.

Key words: 2205 duplex stainless steel, cold rolling deformation, solid-solution and aging treatment, microstructure evolution, σ phase precipitation

CLC Number:

TG142

Yuan Aoming, Li Jingkun, Gao Xiaodan, Ren Xueping. Effect of cold rolling and aging process on σ phase precipitation of 2205 duplex stainless steel[J]. Heat Treatment of Metals, 2021, 46(10): 26-30.

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