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 PrecipitatedσPhase of 2507 Super Duplex Stainless Steel

作　　者：易忠烈 陈兴润 魏海霞 钱张信 赵得江 Yi Zhonglie;Chen Xingrun;Wei Haixia;Qian Zhangxin;Zhao Dejiang(Hongxing Iron&Steel Co.,Ltd.,Jiuquan Iron and Steel Group Corporation,Jiayuguan 735100)

机构地区：[1]酒泉钢铁集团宏兴钢铁股份有限公司,嘉峪关735100

出　　处：《特殊钢》2023年第2期17-20,共4页Special Steel

摘　　要：采用Gleeble 3500-GTC对Φ10 mm 2507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。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 precipitatedσphase was analyzed by combining with EPMA(electro-probe macroanalyser)observation,EBSD(electro backscattering diffraction)phase analysis and thermodynamic calculation.The results show that theσphase exists in the structure of 2507 super duplex stainless steel under the cooling rate of 1℃/min,and the area percentage ofσphase 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 theσphase precipitates is.

关 键 词：2507超级双相不锈钢 冷却速率 Σ相 热力学计算 

分 类 号：TG142.71[一般工业技术—材料科学与工程]