钎焊保温时间对GH738与GH4169镍基合金真空钎焊接头组织性能的影响
Effect of Brazing Holding Time on Microstructure and Property of GH738 /GH4169 Vacuum Brazing Joint
石 昆1， 于治水1， 李 军1， 李瑞峰2
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作者单位：1.上海工程技术大学 材料工程学院，上海 201620; 2. 华东船舶工业学院 材料科学与工程学院,江苏 镇江212003
中文关键字：镍基合金；真空钎焊；镍基钎料；钎焊保温时间
英文关键字：inconel superalloy; vacuum brazing; nickel based filler; brazing holding time
中文摘要：用镍基钎料钎焊镍基合金时钎焊保温时间对钎缝易产生金属间化合物、晶界渗入脆化现象有重要影响，因此采用5、15和45 min 三种钎焊保温时间对镍基合金进行真空钎焊试验，通过光学显微镜、扫描电镜、X射线能谱仪及硬度计等研究了三种钎焊保温时间下钎焊接头微观组织、成分及显微硬度分布等内容。结果表明，随着钎焊保温时间的延长，接头钎料与母材之间的元素扩散越充分，当钎焊保温时间为45 min时，接头组织大部分为固溶体。
英文摘要： The effects of brazing holding time on inconel superalloy vacuum brazing were evaluated. Brazing holding time was crucial to intermetallic compounds formation and grain boundary brittle phenomenon in the inconel superalloy brazing by using nickel based filler. Microstructure of the joints brazed, element distribution and microhardness was evaluated at brazing holding for 5 min， 15 min and 45 min by optical microscope，scanning electron microscope， energy dispersive X-ray spectroscopy and microhardness meter. The results show that elements diffusion is more active along with the lengthen of the brazing holding time between the nickel based filler and based metal. The microstructure of the joints brazed is mainly solid solution when the brazing holding time is 45 min.