Precipitation behavior of σ phase in 2507 super duplex stainless steel

doi:10.13251/j.issn.0254-6051.2022.04.017

Abstract

Abstract: Precipitation of σ phase in 2507 (S32750) super duplex stainless steel aged at 700-1000 ℃ for different time and its influence to impact property and corrosion resistance were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical workstation. The results show that the precipitation rate of σ phase is very fast in 2507 super duplex stainless steel, and the precipitation amount increases first and then decreases gradually with the extension of aging time. Precipitation of σ phase is the fastest after aging at 850-900 ℃, which leads to the serious reduction of impact toughness and corrosion resistance of the steel. It is recommended that the aging temperature should not be lower than 950 ℃.

Key words: 2507 super duplex stainless steel, σ phase, impact property, corrosion resistance

CLC Number:

TG142.71

Bai Qingqing, Zhang Zhihong, Zheng Huaibei, Wang Yinghu. Precipitation behavior of σ phase in 2507 super duplex stainless steel[J]. Heat Treatment of Metals, 2022, 47(4): 108-115.

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