在TIG粉末焊接中Y₂O₃对ODS合金焊接接头组织和性能的影响

梁申勇,雷玉成,赵凯,朱强

(江苏大学 材料科学与工程学院,江苏 镇江 212013)



摘要:

ODS铁素体钢进行熔化焊接时容易出现氧化物颗粒聚集现象,采用TIG 填充粉末焊接能有效避免这种现象的产生,本文通过TIG填充焊接重点研究了焊接填充粉末成分与焊接接头性能之间的关系．试验结果表明:在合适的Y₂O₃填充粉末和工艺条件下焊接ODS铁素体钢,能得到外观美观无裂纹、高强度、高硬度的焊接接头;适当Y₂O₃含量的合金填充粉末能有效抑制ODS铁素体钢熔化焊接时氧化物颗粒的聚集、细化晶粒、产生新的增强颗粒相;这些均匀分布在焊缝金属上的纳米级和亚微米级颗粒呈Y—M—O类型结构,有效提高了ODS铁素体钢焊接接头的组织和性能．

关键词:  熔化焊接  TIG  ODS铁素体钢  填充粉末  焊接接头  Y₂O₃

DOI：10.11951/j.issn.1005-0299.20130504

分类号:

基金项目:国家自然科学基金资助项目(51075191);江苏省高校博士创新基金项目(CXZZ11-0556).



Effect of Y₂O₃ on microstructure and mechanical properties of ODS welded joint in TIG powders welding

LIANG Shen-yong, LEI Yu-cheng, ZHAO Kai, ZHU Qiang

(School of Material Science and Engineering of Jiangsu University, Zhenjiang 212013, China)

Abstract:

When oxide dispersion strengthened (ODS) ferritic steels are melted in traditional fusion welding, the oxide particles are easy to aggregate. Tungsten Insert Gas (TIG) welding of filler powders can effectively solve this problem. This paper mainly researches the relationship between the properties of the welded joint and the chemical composition of the filler metal powders by TIG welding in filler powders. The results show that the ODS ferritic steels can be welded with proper content of Y₂O₃ and weld craft to get welded joint with good appearance, high strength and high hardness; the proper Y₂O₃ filler metal powders can effectively restrain the oxide particles from gathering, fine grains and produce new reinforcing particles; the nanometers or sub-micrometer particles Y—M—O are evenly distributed in the weld metal, which can effectively improve the comprehensive performance of ODS ferritic steels welded joint.

Key words:  fusion welding  TIG  ODS ferritic steel  filler powders  welded joint  Y₂O₃