Nb-Ti微合金钢热变形后组织演变及第二相粒子析出行为  

Phase Transformation and Second-phase Precipitation Behavior of Nb-Ti Microalloyed Steel during Cooling after Deformation

作　　者：吴新朗[1] 赵征志[1] 田允[1] 唐荻[1] 刘光明[2] 代晓莉[2] 熊爱明[2] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]首钢技术研究院,北京100041

出　　处：《钢铁钒钛》2008年第1期66-70,共5页Iron Steel Vanadium Titanium

摘　　要：利用GLEEBLE-2000对试验钢进行热模拟试验,并结合显微硬度测试,研究了一种Nb-Ti微合金钢热变形奥氏体的变形后冷却相变行为。利用JEM—2000FX电镜对碳膜萃取复型法获取的第二相析出物进行分析,从而对热变形后冷却相变中的第二相析出行为进行了研究,探讨了不同冷却速度对第二相析出的影响,结果表明,有大量弥散分布的细小粒子析出,析出相主要以Nb-Ti碳氮化物复合相形式存在,一般呈方形、椭圆形、圆形以及不规则形状,并且随着冷却速度的增加,第二相析出增多且变得细小。The phase transformation behavior of Nb - Ti microalloyed steel during cooling process after deformation was studied by the Gleeble - 2000 thermomechanical experiment simulator and by means of a combined method of microscopic hardness measurement. In addition, both second - phase precipitation behavior during cooling after deformation and the effect of cooling rate on the second-phase precipitation were studied by the carbon extraction replicas technique. The results show that there a lot of fine dispersed particles which are main Nb - Ti carbonitride phase are precipitated . The shape of the secondary phase particles is general like square ,elliptical,circular shape and irregular shape. With the cooling rate increasing, the second-phase precipitation particles are seen to have become finer and the number of them are increasing.

关 键 词：Nb—Ti微合金钢 组织演变 第二相粒子 析出 

分 类 号：TG142.15[一般工业技术—材料科学与工程]