Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel

易忠烈; 陈兴润; 魏海霞; 钱张信; 赵得江

doi:10.20057/j.1003-8620.2022-00114

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Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel

更新时间：2026-01-21

- Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel
- Special Steel Vol. 44, Issue 2, Pages: 17-20(2023)
- 作者机构：
  
  酒泉钢铁集团宏兴钢铁股份有限公司,嘉峪关,735100
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00114
  CLC：
- Received：28 September 2022，
  
  Online First：24 March 2023，
  
  Published：24 March 2023
- 稿件说明：
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易忠烈, 陈兴润, 魏海霞, et al. Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel[J]. Special Steel, 2023, 44(2): 17-20.
DOI：

易忠烈, 陈兴润, 魏海霞, et al. Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel[J]. Special Steel, 2023, 44(2): 17-20. DOI： 10.20057/j.1003-8620.2022-00114.

摘要

采用Gleeble 3500-GTC 对φ10 mm2507 超级双相不锈钢(/%:0.017C

6.22Ni

25.73Cr

3.39Mo

0.27N)进行1340℃至室温以冷速1～500℃/min连续冷却实验，并通过EPMA (电子探针)、EBSD (电子背散射衍射)和热力学计算分析冷却速率对超级双相不锈钢σ相析出的影响。结果表明：2507超级双相不锈钢在1℃/min的冷却速率下，组织中存在σ相，σ相的面积百分比为2.67%。当冷却速率≥10℃/min

组织只有奥氏体和铁素体两相组成。热力学计算结果表明，冷却速率越小，σ相析出越容易。

Abstract

Continuous cooling test of 2507 super duplex stainless steel(/%:0.017C

6.22Ni

25.73Cr

3.39Mo

0.27N) from 1340 ℃ to room temperature by cooling rate 1-500 ℃/min has been carried out by using Gleeble 3500-GTC. The influence of cooling rate on precipitated α phase was analyzed by combining with EPMA (electro-probe macroanalyser)observation

EBSD (electro backscattering diffraction)phase analysis and thermodynamic calculation. The results show that the σ phase exists in the structure of 2507 super duplex stainless steel under the cooling rate of 1 ℃/min

and the area percentage of σ phase is 2.67%.When the cooling rate is faster than 10 ℃/min

the solidification structure is only composed of austenite and ferrite. The thermodynamic calculation results show that the smaller the cooling rate is

the easier the σ phase precipitates is.

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