The hot-tearing tendency of AA1050 auminuml alloy solidifying in a ring-shaped test-casting mold was investigated in real-time and in sit6u via an acoustic emission (AE) and a temperature-data acquisition and analysis (TDA) techniques. In lab-scale experiments. AE signals were acquired simultaneously with temperature monitoring by the use of an inserted steel wave guide and a K-type thermocouple placed in the final freezing zone. These measurements have provided a time definition for AE signal characteristics and a definite time-temperature reference-frame for solidification and defect formation events. Hence, a technique of AE signal analysis combined with computer-aided cooling-curve analysis (CA-CCA) was developed. It was shown that the AE technique is effective in detecting hot-tearing occurrences, and can be further developed for mechanistic studies of hot-tearing, and possibly as a quality control tool for the casting industry.
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