电弧焊熔滴金属中夹杂物形成的冶金机制  

Metallurgical mechanism of inclusion forming in droplet metal with arc welding

作　　者：李晓泉[1] 初雅杰[1] 杨宗辉[1] 张炎[1] 

机构地区：[1]南京工程学院材料工程学院,南京211167

出　　处：《焊接学报》2010年第10期5-8,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(5107519);江苏省自然科学基金资助项目(BK2009354);江苏省高校"青蓝工程"中青年学术带头人培养对象资助项目;南京工程学院科研基金资助项目(KXJ08136)

摘　　要：以实验室自行制作的两种氧化物渣系烧结焊剂对电弧焊熔滴金属中夹杂物形成机制开展研究.作者通过设计出熔滴金属快速提取的试验方法,对提取出的熔滴金属用LECO氧氮分析仪进行氧含量测试、用镶嵌熔滴法分析夹杂物分布及尺寸特征、用扫描电镜配合能谱仪观察分析夹杂物微区形貌及成分.结果表明,熔滴金属内部夹杂物随焊渣碱度的增大呈细小均匀分布规律,构成夹杂物的元素与焊渣成分具有异同的成分特征,主要由Si,Mn,O元素组成.夹杂物形成机制主要通过钢-渣界面冶金化学反应及内部体扩散形成内生夹杂物.利用夹杂物诱发针状铁素体形核(可通过控制焊渣碱度大小进而有效地控制夹杂物尺寸),使其对焊缝固态相变产生积极的影响.The metallurgical mechanism of inclusion forming in droplet metal,which weld was in arc weling with two kinds of oxide slag system sintered fluxes self-made in laboratory,was studied.With the rapidly extracted droplet metal experimental method designed,the oxygen content of droplet metal taken out was measured with LECO oxygen and nitrogen analyzer.Inlaying droplet method was used to analyze the size and distributing characteristics of inclusions,and scan electronic microscope/energy dispersive X-ray microanalysis were used to observe micro-topography and composition of micro-area in inclusion.The results show that with the increase of basicity index,the inclusions in droplet metal become finer and present more uniform distribution,and the composition of inclusion,mainly consisting of Si,Mn and O,is quite different from that of molten slag.The forming mechanism is chiefly based on interfacial chemical reactions of slag-metal and endogenous inclusion combined by bulk diffusion.It is possible to apply inclusions to induce acicular ferrite formation by controlling molten slag basicity index so as to effectively controlling the size of inclusions,and make it become beneficial for weld metal solid transformation.

关 键 词：电弧焊 熔滴金属 夹杂物 形成机制 

分 类 号：TG445[金属学及工艺—焊接]