Precipitated phase change of HR3C steel during aging characterized by nonlinear ultrasonic technique

doi:10.13251/j.issn.0254-6051.2020.02.048

Abstract

Abstract:

Microstructure change of HR3C steel during long-term aging at 700 ℃ and 750 ℃ was studied and characterized by nonlinear ultrasonic technique. Test results show that the main precipitated phases are M₂₃C₆ and Z-phase during aging, and their total area fraction and average diameter increase with the increase of aging time and temperature. The aged specimens were measured by nonlinear ultrasonic technique. The results show that the nonlinear ultrasonic coefficient increases with the increase of aging time and temperature, and the rising trend is correlated with the total area fraction of the precipitated phases, which indicates that the nonlinear ultrasonic coefficient is sensitive to the change of precipitates and can be used to characterize the microstructure change of HR3C steel during aging.

Key words: HR3C steel, aging, nonlinear ultrasonic technique, microstructure, precipitated phase

CLC Number:

TG142.73

Fan Deliang, Wang Zhiwu, Yuan Tingbi. Precipitated phase change of HR3C steel during aging characterized by nonlinear ultrasonic technique[J]. HTM, 2020, 45(2): 242-249.

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