过共晶ZA合金TIG焊接熔合区成分及微观组织特征  

The Composition and Microstructure Character of Bond Area of Super eutectic ZA Alloy in TIG Welding

作　　者：刘秀忠[1] 赵东建[1] 张炯法[2] 朱兴海 

机构地区：[1]山东大学材料科学与工程学院,济南250061 [2]山东科技大学职业技术学院,泰安271021 [3]济南市锅炉压力容器检验研究所,济南250011

出　　处：《焊接学报》2001年第3期47-50,共4页Transactions of The China Welding Institution

基　　金：山东省科技发展计划资助项目 (993 175 10 1)

摘　　要：用光学显微镜、透射电镜、扫描电镜、能谱分析、显微硬度等分析手段 ,对ZA合金TIG焊接熔合区的显微组织及其形态、显微硬度及成分等进行了研究。结果显示在选用同质填充材料的情况下 ,焊接熔合区的锌含量低于焊缝和母材 ,铝及铜的含量则高于母材 ;熔合区的组织形态主要是柱状树枝晶 ,室温组织主要是Zn相、α相和Al4Cu9、CuTi2 、Al7Cu3 Mg6化合物 ;熔合区的组织形态变化较大 ,靠近焊缝的组织较细密 ,可见细薄的类珠光体Zn和α层片组织 ,靠近母材的组织较粗大 ,但仍比母材的组织细密 ,没有出现类似低合金钢焊接时的粗晶区。熔合区细小化合物的显微硬度较高 ,可对基体起强化作用。用TIG方法焊接过共晶ZA合金 ,熔合区不会出现粗大的过热组织 ,且组织的细化及细小的化合物都对基体起强化作用 ,这有利于提高焊接接头的综合力学性能。The influence of the evaporation and oxygenation of zinc during welding process was studied.The character of microstructure and micro rigidity of bond area of the ZA alloy in the TIG welding was investigated using TME、SME and other methods.The results show that when filler material is similar to parent mental,Zn content in bond area is lower than that in the weld and the parent metal.The Cu and Al contents in bond area are higher than that in the parent metal.The microstructure morphology of the bond area is mainly columnar dendrite.The microstructure in room temperature is mainly Zn phase、αphase and compounds of Al 4 Cu 9 、CuTi 2 、Al 7 Cu 3 Mg 6 .The microstructure in bond area has bigger change and is tiny near the weld.Some fine and thin lamella Zn and α Zn similar to pearlyte can be observed ther.The microstructure near the parent metal is coarser,but it is still thinner than that in the the parent metal.The coarse grained zone did not appear as the case in alloy steels.The thin compounds of the bond area have higher micro hardness.They can strengthen the basic structure.When welding super eutectic ZA alloy by TIG welding method,there is no coarse overheated microstructure happened.But thin microstructure and compound can strengthen base.This is advantageous to improve the mechanical properties of the welded joint.

关 键 词：TIG焊 熔合区 锌合金 微观组织 焊接 

分 类 号：TG457.19[金属学及工艺—焊接] TG444.7