堆焊区域成分、组织和显微硬度的统计分布表征  

Statistic distribution characterization of compositions,microstructure and microhardness in surfacing area

作　　者：李冬玲 杨丽霞 卢毓华 朱跃进[2] LI Dong-ling;YANG Li-xia;LU Yu-hua;ZHU Yue-jin(Beijing Key Laboratory of Metal Material Characterization, China Iron and Steel Research Institute Group, Beijing 100081, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China)

机构地区：[1]中国钢研科技集团金属材料表征北京市重点实验室,北京100081 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《钢铁研究学报》2018年第2期139-143,共5页Journal of Iron and Steel Research

基　　金：北京市科技计划资助项目(D161100002416002)

摘　　要：采用激光诱导击穿光谱原位分析仪、全自动金相和显微维氏硬度分析仪对X80管线钢堆焊融合区的成分、显微组织和硬度进行了统计分布表征。发现堆焊区域不同元素含量分布具有较大差别,Ti在母材与焊材的融合区上有一个环状富集带,而融合区内C的分布没有明显变化。不同融合区域显微组织各异,管线钢基体组织晶粒细小,主要由条块状的铁素体和少量珠光体组成。在热影响区基体的组织发生再结晶,出现较多的粒状贝氏体,在熔敷金属交界处,出现了大量板条状马氏体和贝氏体,且晶粒组织粗大。母材的维氏硬度较焊材低,在融合区内出现了一个硬度较高的环状区域,这与管线钢焊接区域的成分和组织分布密切相关。The distribution characterization of compositions,microstructure and hardness in surfacing fusion zone of X80 pipeline steel was done by laser induced breakdown spectrum original position analyzer,automatic metallographic and micro Vickers hardness instruments.The results show that the content distributions are very different for some elements in the surfacing area.There is a cricoid enrichment zone of Ti in the fusion area of base metal and welding material,and significant change for the content distribution of C is not found.The microstructures in different fusion area are also very different.The grain is fine and there are a lot of strip ferrite and a little pearlite in the matrix organization of pipeline steel.In heat affected zone,recrystallization of the grain occurs and a large number of granular bainites appear.At the junction of weld melted metal,the grains get larger and a lot of lath martensites and bainites come into being.Vickers hardness of base metal is lower than welding material and a cricoid zone with higher Vickers hardness appeared in the fusion area.The micro-hardness distribution has close relationship with the composition distributions of the elements and microstructure distribution in welding area of pipeline steel.

关 键 词：管线钢 堆焊 成分 显微组织 硬度 分布 

分 类 号：TG455[金属学及工艺—焊接]