Dissimilar joining of P/M superalloy and single crystal superalloy using Ni–Cr–B brazing alloy

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• 作者：Bo Chen ; Hua-Ping Xiong ; Wei Mao ; Yao-Yong Cheng ; Xin Wu
• 关键词：Single crystal materials ; Brazing ; Strength ; Diffusion
• 刊名：Welding in the World
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：59
• 期：6
• 页码：911-915
• 全文大小：942 KB
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• 作者单位：Bo Chen (1)
  Hua-Ping Xiong (1)
  Wei Mao (1)
  Yao-Yong Cheng (1)
  Xin Wu (1)
  
  1. Laboratory of Welding and Forging, Beijing Institute of Aeronautical Materials, Beijing, 100095, China
  
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669

文摘

An advanced technology for joining powder metallurgy (P/M) superalloy and single crystal (SC) superalloy is highly needed for fabricating a high-strength turbine bladed disk and the joints must meet the requirements of harsh working conditions. In the present paper, P/M superalloy FGH96 and SC superalloy DD6 were joined together using a Ni–Cr–B brazing alloy. The microstructure of the joint brazed at 1120 °C for 10 min showed that massive Ni₃B phase was formed in the central part of the brazing seam. In the FGH96 matrix near the brazing seam, a small bright phase which contained some element B, Cr, Mo, and W distributed along with grain boundary. The joints were subjected to a diffusion heat treatment at 1000 °C for 1, 4, and 16 h, respectively. The results showed that the diffusion depth of B is increased from 80 μm at 1000 °C/1 h to 140 μm at 1000 °C/16 h. In addition, the bright phase was refined obviously, implying the homogenization of the joint microstructure. Compared with the joints treated for 1 and 4 h, the strength of the joints treated for 16 h was increased remarkably from 604?30 to 913 MPa. Keywords (IIW Thesaurus) Single crystal materials Brazing Strength Diffusion