采用3种非晶态镍合金作中间层,对双相不锈钢进行瞬间液相连接试验研究.试验结果表明:采用MBF-30作中间层在1 060℃和300 s进行连接时,等温凝固完成,连接中间区以γ-Ni相为主,BN出现在基体与中间层的界面处.但是,MBF-35作中间层在1 060℃和300 s进行连接时,等温凝固未能完成,连接中心部含有Ni3 Si；采用MBF-50作中间层在1 175℃和300 s进行连接时,BN和(Cr,Ni)3Si相出现在连接中间区,等温凝固仍未能完成(等温凝固完成时间大于14 400 s),而采用溶质分布模型计算结果仅为71s.微观结构及等温凝固的差异归因于在较高温度下存在Si,N和Cr等合金元素并在连接中心处富集.%An experimental investigation on transient liquid-phase bonding of a duplex stainless steel was carried out using Ni-based amorphous alloy as the interlayer. The experimental results show that using MBF-30 as the interlayer at 1 060 ℃ for 300 s, isothermal solidification is completed and the bonding region is mainly γ-Ni phase. However, using MBF-35 as the interlayer at 1 060 ℃ for 300 s, isothermal solidification is not completed and the joint center region is consisted of Ni3Si. Using MBF-50 as the interlayer at 1 175 ℃ for 300 s, BN and (Cr, Ni)3Si are present in the bond center zone and the isothermal solidification is still not completed, which takes longer than 14 400 s, whereas the time calculated by solute distribution model is only 71s. The differences of microstructure and isothermal solidification originate from the appearance and enrichment of Si, Cr and N alloying elements in the bond center area at higher temperature.
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