Abstract
The increase in sound velocities during the aging of M250 maraging steel reported by Rajkumar et al. was analyzed. The present article provides a new perspective on why and to what extent the sound velocities change during aging. The main parameter that affects the elastic moduli and the sound velocities in the early and intermediate stages of aging in maraging steel is the depletion of Ni from the martensitic matrix due to Ni3Ti and Ni3Mo formation. The issue of sound velocity increase with aging time was addressed here in a few different ways to support the validity of Ni depletion.
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Notes
145 psi = 1 MPa.
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Acknowledgments
The author acknowledges the contribution of Mr. U. Ben-Ezer for casting the samples, and he appreciates the remarks of Drs. Peter Finkel and Michel W. Barsoum, Drexel University, to this manuscript.
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Manuscript submitted July 8, 2008.
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Yeheskel, O. Ultrasonic Characterization of Aging Behavior in M250 Grade Maraging Steel. Metall Mater Trans A 40, 684–690 (2009). https://doi.org/10.1007/s11661-008-9740-x
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DOI: https://doi.org/10.1007/s11661-008-9740-x