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.
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)
出处
《特殊钢》
2023年第2期17-20,共4页
Special Steel
