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http://www.dbpia.co.kr/Journal/ArticleDetail/3461640


한국비파괴검사학회 > 비파괴검사학회지 > 비파괴검사학회지 제34권 제3호


비파괴검사학회지 제34권 제3호, 2014.6, 220-225 (6 pages)

인공시효된 Al6061-T6의 초음파 비선형 특성 평가

Evaluation of Ultrasonic Nonlinear Characteristics in Artificially Aged Al6061-T6
김종범, 이경준, 장경영, 김정석
한국어 초록
  초음파 비선형 특성은 일반적으로 재료 내부를 전파한 초음파의 기본주파수 및 2차 고조파 성분 크기에 의해 결정되는 비선형 파라미터 β로 측정되며, 재료의 미세한 변질을 평가하는데 효과적인 인자로 알려져 있다. 이에 본 연구에서는 인공시효된 Al6061-T6의 열처리 시간에 따른 초음파 비선형 특성을 평가하였다. 초음파가 시편을 투과하여 수신되는 신호를 분석하여 비선형 파라미터 β를 구하였고, 비선형 파라미터 측정 후 마이크로 비커스 경도를 측정하였다. 비선형 파라미터 측정 결과로부터 열처리 시간에 따른 재료 내 미세 구조적인 변화를 추정하였으며, 경도 측정 결과로부터 이러한 추정이 합당함을 증명하였다. 측정 결과 비선형 파라미터는 석출거동 메커니즘에 의한 재료 미세조직 변화와 매우 밀접한 상관관계를 나타냈다. 이로 부터 초음파 비선형 파라미터를 이용하여 인공시효에 의한 재료 내 미세구조 및 상태 변화를 초음파 비선형 파라미터로 평가할 수 있음을 확인하였다.
영어 초록
  Generally, the nonlinearity of ultrasonic waves is measured using a nonlinear parameter β, which is defined as the ratio of the second harmonic’s magnitude to the power of the fundamental frequency component after the ultrasonic wave propagates through a material. Nonlinear parameter β is recognized as an effective parameter for evaluating material degradation. In this paper, we evaluated the nonlinear parameter of Al6061-T6 which had been subjected to an artificial aging heat treatment. The measurement was using the transmitted signal obtained from contact-type transducers. After the ultrasonic test, a micro Vickers hardness test was conducted. From the result of the ultrasonic nonlinear parameter, the microstructural changes resulting from the heat treatment were estimated and the hardness test proved that these estimates were reasonable. Experimental results showed a correlation between the ultrasonic nonlinear parameter and microstructural changes produced by precipitation behavior in the material. These results suggest that the evaluation of mechanical properties using ultrasonic nonlinear parameter β can be used to monitor variations in the mechanical hardness of aluminum alloys in response to an artificial aging heat-treatment.
목차
초록
Abstract
1. 서론
2. 음향 비선형 파라미터
3. 실험 방법
4. 실험 결과
5. 결론
참고문헌
키워드상세서지
  • 발행기관 : 한국비파괴검사학회
  • 자료유형 : 전자저널 논문
  • 등재정보 : KCI 등재
  • 작성언어 : 한국어
  • 파일형식 : Text PDF
  • KORMARC 보기
  • URL : http://www.dbpia.co.kr/Article/3461640 복사 즐겨찾기로 추가

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