Ti-37.5Zr-15Cu-10Ni钎焊钼的钎缝组织分析
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摘要
采用Ti-37.5Zr-15Cu-10Ni非晶钎料真空钎焊钼,获得Mo/Mo钎焊接头,研究钎焊过程液态钎料与母材的相互作用.结果表明,液态Ti-37.5Zr-15Cu-10Ni钎料与钼发生扩散–溶解,即母材钼向钎料中的溶解和钎料组分向母材的扩散.随钎焊温度的升高,钼向钎料中溶解量增加,凝固后钼主要固溶在Ti基固溶体内;随钎焊温度的升高,发生钎料组分向母材晶间的扩散,当温度为900℃时,发生显著的晶间渗入现象.为得到良好的钎焊接头,避免母材过量溶解和晶间渗入的发生,Ti-37.5Zr-15Cu-10Ni钎料真空钎焊钼温度不宜高于900℃.
Mo/Mo joints were prepared by brazing Mo with Ti-37.5Zr-15Cu-10Ni brazing filler metal. The interaction between brazing filler metal and base metal was studied. The results showed that the liquid Ti-37.5Zr-15Cu-10Ni and Mo were diffused and dissolved, the dissolution of the base metal Mo into the brazing filler metal and the diffusion of the brazing filler metal to the base metal. With the increase of the brazing temperature, the amount of Mo dissolved in the brazing filler metal increased, and the Mo was mainly dissolved in the Ti solid solution after solidification.With the increase of the brazing temperature, the brazing filler metal diffused into grain boundaries and intergranularpenetration was observed when the brazing temperature was900 °C. In order to obtain good joint quality, avoid excessive dissolution of base metals and intergranular penetration, the temperature brazing Mo with Ti-37.5Zr-15Cu-10Ni should not be higher than 900 °C.
Mo/Mo joints were prepared by brazing Mo with Ti-37.5Zr-15Cu-10Ni brazing filler metal. The interaction between brazing filler metal and base metal was studied. The results showed that the liquid Ti-37.5Zr-15Cu-10Ni and Mo were diffused and dissolved, the dissolution of the base metal Mo into the brazing filler metal and the diffusion of the brazing filler metal to the base metal. With the increase of the brazing temperature, the amount of Mo dissolved in the brazing filler metal increased, and the Mo was mainly dissolved in the Ti solid solution after solidification.With the increase of the brazing temperature, the brazing filler metal diffused into grain boundaries and intergranularpenetration was observed when the brazing temperature was900 °C. In order to obtain good joint quality, avoid excessive dissolution of base metals and intergranular penetration, the temperature brazing Mo with Ti-37.5Zr-15Cu-10Ni should not be higher than 900 °C.
引文
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[3]Denisov V N,Klyatskin A S,Butrim V N,et al.Producing composite single-crystal molybdenum mirrors by diffusion welding in the hot isostatic pressing conditions[J].Welding International,2017,31(7):571-576.
[4]Ambroziak A.Friction welding of molybdenum to molybdenum and to other metals[J].International Journal of Refractory Metals&Hard Materials,2011,29(4):462-469.
[5]Ganjeh E,Sarkhosh H.Microstructural,mechanical and fractographical study of titanium-CP and Ti-6Al-4V similar brazing with Ti-based filler[J].Materials Science&Engineering A:Structural Materials Properties Microstructure&Processing,2013,559(1):119-129.
[6]Chen B,Xiong H P,Mao W,et al.Microstructures and properties of Ti3Al/Ti3Al and Ti3Al/GH536 joints using Ti-37.5Zr-15Cu-10Ni brazing filler[J].Journal of Aeronautical Materials,2010,30(5):35-38.
[7]Asthana R,Singh M.Evaluation of amorphous Ti brazes to join zirconium diboride-based ultra-high-temperature ceramics to metallic systems[J].International Journal of Applied Ceramic Technology,2014,11(3):502-512.
[8]张启运,庄鸿寿.钎焊手册-第2版[M].北京:机械工业出版社,2008.