Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effect of Bonding Condition on the Tensile Properties of Diffusion Bonded Haynes230

고상확산접합된 Haynes230의 인장성질에 미치는 접합조건의 영향

  • Kang, Gil-Mo (Dept. of Material Science and Engineering, Pusan National University) ;
  • Jeon, Ae-Jeong (National Core Research Center(NCRC), Pusan National University) ;
  • Kim, Hong-Kyu (Agency for Defense Development) ;
  • Hong, Sung-Suk (Agency for Defense Development) ;
  • Kang, Chung-Yun (Dept. of Material Science and Engineering, Pusan National University)
  • 강길모 (부산대학교 재료공학부) ;
  • 전애정 (부산대학교 하이브리드소재솔루션 국가핵심연구센터) ;
  • 김홍규 (국방과학연구소) ;
  • 홍성석 (국방과학연구소) ;
  • 강정윤 (부산대학교 재료공학부)
  • Received : 2013.05.28
  • Accepted : 2013.06.25
  • Published : 2013.06.30
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Abstract

This study investigated the effect of bonding temperature and holding time on microstructures and mechanical properties of diffusion bonded joint of Haynes230. The diffusion bonds were performed at the temperature of 950, 1050, and $1150^{\circ}C$ for holding times of 30, 60, 120 and 240 minutes at a pressure of 4MPa under high vacuum condition. The amount of non-bonded area and void observed in the bonded interface decreased with increasing bonding temperature and holding time. Cr-rich precipitates at the linear interface region restrained grain migration at $950^{\circ}C$ and $1050^{\circ}C$. However, the grain migration was observed in spite of short holding time due to the dissolution of precipitates to base metal in the interface region at $1150^{\circ}C$. Three types of the fracture surface were observed after tensile test. The region where the coalesce and migration of grain occurred much showed high fracture load because of base metal fracture whereas the region where those did less due to the precipitates demonstrated low fracture load because of interface fracture. The expected fracture load could be derived with the value of fracture area of base metal ($A_{BF}$) and interface ($A_{IF}$), $Load=201A_{BF}+153A_{IF}$. Based on this equation, strength of base metal and interface fracture were calculated as 201MPa and 153MPa, respectively.

Keywords

References

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