Separation of AE signals for detecting solidification cracking of Al-7mass%Si alloy by using acoustic emission method

Itaru Endo, Hiroyuki Chiba, Toru Ueki, Takanari Toriyama, Makoto Yoshida

    Research output: Contribution to journalArticle

    Abstract

    Detection of solidification cracking of Al-7 mass%Si alloy was attempted by using acoustic emission method. According to our previous report, it was found that it is necessary to separate AE of solidification cracking from other estimated sources such as gas porosity, shrinkage cavity, or eutectic solidification to detect AE of solidification cracking. Then, we investigated about AE signals of gas porosity, shrinkage cavity, and eutectic solidification. As a result, AE of eutectic solidification was not generated or was too small to detect. AE of shrinkage cavity and gas porosity formation were detected at the start of eutectic solidification, and the frequency band was 150 kHz or less. The frequency band of AE accompanied with fracture of solidifying castings was also 150 kHz or less. Therefore, it was difficult to separate AE of solidification cracking from gas porosity, shrinkage cavity, or eutectic solidification by the frequency band. However, integrated AE peak volt during solidification correlated with crack ratio. When Solidification cracking occurred, Integrated AE peak volt was about more than 1000 V during solidification. In situ detection of solidification cracking will be possible by investigating integrated AE peak volt.

    Original languageEnglish
    Pages (from-to)492-498
    Number of pages7
    JournalKeikinzoku/Journal of Japan Institute of Light Metals
    Volume60
    Issue number10
    DOIs
    Publication statusPublished - 2010

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    Keywords

    • Acoustic emission
    • Aluminum
    • Direct chill casting
    • Hot tearing
    • Solidification cracking

    ASJC Scopus subject areas

    • Materials Chemistry
    • Metals and Alloys
    • Mechanical Engineering
    • Mechanics of Materials

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