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

doi:10.20057/j.1003-8620.2022-00114

Abstract

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.

Key words: 2507 Super Duplex Stainless Steel, Cooling Rate, Phase, Thermodynamic Calculation

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。

关键词: 2507超级双相不锈钢, 冷却速率, σ相, 热力学计算

Yi Zhonglie , Chen Xingrun , Wei Haixia , Qian Zhangxin , Zhao Dejiang. Influence of Cooling Rates on Precipitated σ Phase of 2507 Super Duplex Stainless Steel[J]. Special Steel, 2023, 44(2): 17-20.

易忠烈, 陈兴润, 魏海霞, 钱张信, 赵得江. 冷却速率对2507超级双相不锈钢σ相析出的影响[J]. 特殊钢, 2023, 44(2): 17-20.

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