비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)
- 제21권6호
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- Pages.591-597
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- 2001
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- 1225-7842(pISSN)
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- 2287-402X(eISSN)
Ti-6Al-4V 합금의 내부 미소결함에 따른 초음파 신호 특성 연구
The Characteristics of Ultrasonic Signals for Detecting Micro-Defects in Ti-6Al-4V Alloy
- Choi, Sang-Woo (Graduate School, Pusan National University) ;
- Lee, Joon-Hyun ;
- Kubota, M. (Kyushu University) ;
- Murakami, Y. (Kyushu University)
- 발행 : 2001.12.30
초록
Ti합금은 고온환경에서 고강도가 요구되는 항공기의 엔진 부품등의 소재로 적용되고 있다. Ti합금은 이와 같이 기계적 성능이 우수함에도 불구하고
Ti alloy is used for essential parts of aircraft for high temperature environment. Although Ti alloy has excellent performance in regard to mechanical properties, it is difficult ot find fatigue cracks by nondestructive ultrasonic inspection due to its two-phase microstructure, which consists of hard alpha and beta phases. Sound energy reflected from microstructural features in the component produces a background inspection noise which is seen even when no defects are present. This noise can inhibit the detection of critical internal defects such as pores cracks or inclusions. To obtain fundamental data on ultrasonic inspection of Ti alloy, ultrasonic testing was performed using a specimen with small drill holes and ultrasonic wave propagation velocites were measured.
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