YG15与40Cr钎焊接头中脆性相的析出抑制  

Precipitation Depression of Brittle Metallographic Structure in Brazing of YG15 and 40Cr

作　　者：郑兴睿[1] 万祥明[1] 刘建雄[2] 许炳梁[1] 毕凌成[3] 

机构地区：[1]昆明理工大学城市学院,云南昆明650051 [2]昆明理工大学材料科学与工程学院,云南昆明650093 [3]昆明理工大学外国语言文化学院,云南昆明650500

出　　处：《昆明理工大学学报（自然科学版）》2015年第3期21-26,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51062009)

摘　　要：YG15是WC-Co类硬质合金,其在钎焊过程中易发生脱碳反应.脱碳反应会生成脆性η相组织.此外,钎料中Zn含量过高也会导致脆性相的生成.对影响YG15与40Cr钎焊脆性相生成的因素进行了研究.研究发现焊接时间、焊后保温温度和保温时间对焊接强度影响较大.当保温温度过高或焊接时间过长时,由于焊缝中元素的扩散会导致偏析,特别Fe元素在焊缝界面聚集形成脆性的η相的部位.实验验证经过选择合适的保温温度和焊接时间(400℃温度保温8 h,焊接时间60 s)可以有效的抑制Zn脆性相的生产,得到良好的钎焊接头.YG15（ WC- Co class carbide） is easily decarbonized in brazing. Brittle η metallographic structure is formed as a result of de- carbonization as well as excessive Zn in solder. The study is attempted to find out the factors inducing the appearance of brittle structures in YG15 and 40 Cr brazing. The results indicate that welding time,annealing temperature and annealing time have a great i MPact on weld strength. Specifically,hypothermal or prolonged welding time lead to serious elements segregation,especially among which brittle η metallographic structure of Fe is formed in weld interface. It is demonstrated in the study that keeping a heat preservation temperature at around 400 ℃,holding time within 8 hours and welding time of 60 s contributes to the inhibition of brittle metallographic structure of Zn and that good quality solder joint is then produced.

关 键 词：硬质合金 钎焊 脆性相 析出抑制 

分 类 号：TG454[金属学及工艺—焊接]