Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Additive Powder on Microstructural Evolutions and Mechanical Properties of the Wide-gap Brazed Region in IN738 superalloy

초내열합금 wide-gap 브레이징부의 미세조직 및 기계적 성질 변화에 미치는 첨가금속분말의 영향

  • Kim Y. H. (Division of Materials Science and Engineering, Korea University) ;
  • Kwun S. I. (Division of Materials Science and Engineering, Korea University) ;
  • Byeon J. W. (Research Institute of Engineering and Technology, Korea University) ;
  • Lee W. S. (Advanced Material Division Korea Institute of Industrial Technology)
  • 김용환 (고려대학교 신소재 공학과) ;
  • 권숙인 (고려대학교 신소재 공학과) ;
  • 변재원 (고려대학교 공학기술연구소) ;
  • 이원식 (한국생산기술연구원 나노소재팀)
  • Published : 2005.06.01
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Abstract

The effect of IN738 additive powder on microstructure and mechanical properties of the wide-gap region brazed with BNi-3 filler metal powder was investigated. The wide-gap brazing was conducted in a vacuum of $2\times10^{-5}torr\;at\;1200^{\circ}C$ with various powder mixing ratios of additive to filler powders. The microstructures of the wide-gap brazed region were analyzed by SEM and AES. The region brazed with only BNi-3 filler metal powder had a microstructure consisted of proeutectic, binary eutectic and ternary eutectic structure, while that brazed with a mixture of IN738 additive powder and BNi-3 filler metal powder had a microstructure consisted of IN738 additive powder, binary eutectic of $Ni_3B-Ni$ solid solution and (Cr, W)B. The fracture strength of the wide-gap brazed region was about 680 MPa regardless of the additive powder mixing ratios. Cracks were initiated at the (Cr, W)B and binary eutectic of $Ni_3B-Ni$ solid solution, and propagated through them in the wide-gap brazed region, which lowered the fracture strength of the region.

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References

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