한국산업융합학회 논문집 (Journal of the Korean Society of Industry Convergence)

  • 제22권5호
  • /
  • Pages.491-497
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  • 2019
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  • 1226-833X(pISSN)
  • /
  • 2765-5415(eISSN)
한국산업융합학회 (The Korean Society of Industry Convergence)
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Alloy718/SCM440 마찰용접재의 AE에 의한 동적 거동평가

Evaluation on Dynamic Behavior of Friction Welded Joints in Alloy718 to SCM440 using Acoustic Emission Technique

  • 김동규 (부경대학교 기계조선융합공학과) ;
  • 공유식 (부경대학교 기계공학과) ;
  • 이진경 (동의대학교 기계자동차로봇부품공학부)
  • Kim, Dong-Gyu (Department of Mechanical & Shipbuilding Convergence Engineering, Pukyong National University) ;
  • Kong, Yu-Sik (Department of Mechanical Engineering, Pukyong National University) ;
  • Lee, Jin-Kyung (Division of Mechanical, Automobile and Robot Component Engineering, Dongeui University)
  • 투고 : 2019.05.27
  • 심사 : 2019.09.03
  • 발행 : 2019.09.30
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초록

Dissimilar friction welding were produced using 15 mm diameter solid bar in superalloy(Alloy718) to chrome molybdenum steel(SCM440) to investigate their mechanical properties. Consequently, optimal welding conditions were n=2000 rpm, HP=60 MPa, UP=120 MPa, HT=10 sec and UT=10 sec when the metal loss(Mo) is 3.5 mm. Acoustic Emission(AE) technique was applied to analyze the dissimilar friction welding of Alloy718 and SCM440. The relationship between the AE parameters and dissimilar friction welding of both material was discussed. In the case of heating time of 6 sec, 10 sec, 14 sec and 20 sec, 5 AE events per 0.5 seconds and energy about $2.7{\times}10^{10}$ were exhibited in heating time. In upsetting time, resulting in various numbers of events per second and very low energy. The frequency range of the signal generated during the heating time was about 200 kHz. However, the upsetting time resulted in a wide range of signals from very low frequency to high frequency of 500 kHz due to rapid plasticity of the material.

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참고문헌

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