冷却速率对2507超级双相不锈钢σ相析出的影响

doi:10.20057/j.1003-8620.2022-00114

特殊钢 ›› 2023, Vol. 44 ›› Issue (2): 17-20.DOI: 10.20057/j.1003-8620.2022-00114

冷却速率对2507超级双相不锈钢σ相析出的影响

易忠烈，陈兴润，魏海霞，钱张信，赵得江

酒泉钢铁集团宏兴钢铁股份有限公司，嘉峪关 735100

收稿日期:2022-09-28 出版日期:2023-04-01 发布日期:2023-03-24
通讯作者: 陈兴润
作者简介:易忠烈(1979-)，男，工程师；E-mail：yizhonglie@jiugang.com

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

Yi Zhonglie , Chen Xingrun , Wei Haixia , Qian Zhangxin , Zhao Dejiang

Hongxing Iron &Steel Co.,Ltd., Jiuquan Iron and Steel Group Corporation, Jiayuguan 735100

Received:2022-09-28 Published:2023-04-01 Online:2023-03-24
Contact: Chen Xingrun

摘要/Abstract

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

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

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.

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.

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冷却速率对2507超级双相不锈钢σ相析出的影响

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

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