X70针状铁素体管线钢中的析出行为研究
Cailiao Gongcheng/Journal of Materials Engineering(2006)
Abstract
利用透射电镜和X射线能谱研究了Nb-V-Ti微合金X70针状铁素体管线钢中析出物的形貌、结构和化学成分.观测结果表明所研究钢中的析出物可分为两大类:一类为高温析出的尺寸较大的复合析出物,尺寸较大的方形TiN粒子为复合析出物的核心,而含Nb的尺寸较小的析出物附着在其一侧或多个侧面生长.在较低温度下,Nb的碳化物和(或)碳氮化物在位错和亚界面上非均匀形核析出,尺寸较小,外貌呈球形.根据钢的化学成分、热力学和X射线能谱分析认为,NbC粒子是本工艺条件下所研究的Nb-V-Ti微合金X70针状铁素体管线钢中的主要析出相.
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Key words
Acicular ferrite, pipeline steel, microstructure, carbonitride, precipitation behavior, thermodynamics
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