【摘要】 在MMS-200热模拟实验机上,对S32750超级双相不锈钢在1 000℃,应变速率为0.01～10 s-1的条件下进行了高温压缩实验,利用电子背散射衍射(EBSD)技术对其晶体取向和晶界特征进行了分析.研究结果表明:在低应变速率时,铁素体晶粒出现〈111〉∥压缩轴织构;在高应变速率时,〈001〉织构又明显增加.铁素体晶粒随着应变速率的增加变得细小,而小角度晶界数量增加;在应变速率为10 s-1时,形变后奥氏体晶粒得到了〈110〉织构.应变速率的增加使奥氏体晶粒变大,小角度晶界数量增加.奥氏体相在小应变速率条件下变形可以获得更多的Σ3孪晶界.更多还原

【Abstract】 Under 1 000 ℃ and strain rate range of 0.01～10 s-1,the hot compression test of super duplex stainless steels S32750 was carried out with MMS-200 thermal-mechanical simulator.EBSD(electron backscattering diffraction) technique was applied to analyze grain orientation and grain boundary characters.The results showed that the 〈111〉 texture appears in ferrite under lower strain rate,and the additional 〈001〉 texture appears under higher strain rate.The ferrite grains become finer and the number of small angle grain boundaries increases with the increasing of strain rate.The 〈110〉 texture appears in the deformed austenite under the strain rate of 10 s-1.The austenite grain size and the number of small angle grain boundaries increase with the increasing of strain rate.A lot of Σ3 twin boundaries appear in the deformed austenite under lower strain rate.更多还原