X80管线钢落锤撕裂性能的影响因素分析

Factors Affecting DWTT Property of X80 Pipeline Steel

针对管线钢的落锤撕裂性能问题,对比了落锤撕裂性能差别较大的实验材料的显微组织,并从夹杂物百分比、分布、成分角度分析了夹杂物对落锤性能的影响,分析了M/A岛对落锤性能的影响,观察并分析了位错、析出物的分布以及强化机制。结果表明,当组织中有适量的多边形铁素体,较少量的粒状贝氏体,夹杂物较少且分布均匀,趋向于球形,M/A岛弥散细小,不连接成链状,析出物尺寸细小,且分布弥散时,实验材料具有良好的落锤撕裂性能。

According to drop weight tear test（DWTT） for pipeline steels,the microstructure of different DWTT property was compared,percentage,composition and size of inclusions were analyzed,the influence of M/A islands on DWTT was analyzed,the distribution of dislocation and precipitation and strengthening mechanism were analyzed.The results indicated that when the percentage of polygonal ferrite（PF） was proper,the mount of granular bainite（GB） was less,inclusions were distributed dispersively,and nearly spherical, M/A islands were fine and distributed dispersively, which were not linked to form chains, precipitations were fine and distributed dispersively, the materials had good DWTT performance.