期刊
NDT & E INTERNATIONAL
卷 41, 期 6, 页码 484-489出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2008.01.008
关键词
higher harmonics; maraging steel; precipitation kinetics; ultrasonic; nonlinear
Higher order harmonic analysis of ultrasonic signal has been applied to study the precipitation kinetics of 18Ni maraging steel. The material has been solution annealed (SA) at a temperature of 1088 K for I h and then air quenched. Ageing of SA materials have been done at 728 K for different durations of 10 min to 100 h and air cooled. It has been found that the measurement parameter of this new technique increases with the formation of finer precipitates at the initial stage of ageing till 12 h and then decreases at longer holding time with the coarsening of precipitates. (C) 2008 Elsevier Ltd. All rights reserved.
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