Metallurgical Characterization of a Low Carbon Steel Microstructure Using Linear and Nonlinear Ultrasonics
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In this study, linear and nonlinear ultrasonic (UT) methods are utilized to evaluate the microstructures of A572 low carbon steel samples that were intercritically heat-treated at three temperatures and quenched to room temperature. The microstructures were also qualitatively and quantitatively assessed using standard metallography. ImageJ software was used to measure the amount of the phases. Correlations between ferrite content and linear velocity and the acoustoelastic coefficient are established. The experiments show that the UT linear and nonlinear velocities are affected by varying the amounts of ferrite and martensite. The acoustoelastic coefficient is found to be more sensitive to small changes in ferrite volume fraction.
KeywordsA572 steel acoustoelastic coefficient ferrite and martensite intercritical heat treatment linear and nonlinear ultrasonics
This investigation was supported by National Science Foundation Awards 133552 and 1463501. C-SAM equipment was acquired by DoD Equipment Contract No. W911NF-16-1-0500. The support from the sponsoring organizations is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the organizations acknowledged above.
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