8 February 1999 Evaluation of deformation-induced transformation and reversion processes of stainless steel by acoustic microscope
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Abstract
Deformation-induced martensite and reversed austenite of a metastable austenitic stainless steel sheet were evaluated by a scanning acoustic microscope with frequencies 600MHz and 800 MHz. The sheet was elongated up to 40 percent at and below the room temperature to produce martensite, followed by annealing for reversion. First martensite content was measured by a Feritscope. Next using a complex V(z) curve, leaky Rayleigh wave velocity was measured. The deformed and annealed grain structure s were observed with the frequency 800MHz and compared with those by the optical microscope. Rayleigh wave velocity is dependent on the elongation and ambient temperature in elongation and the annealing temperature, which agrees well with the one by the Feritscope. Deformed grains are more clearly observed by the scanning acoustic microscope with 800MHz. The measured value of the velocity is compared with the theoretical one which can be calculated by Young's modulus, Poisson's ratio and the density. The measured Rayleigh wave velocity is well agreement with the theoretical one.
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Yukio Kasuga, Tomio Endo, Chiaki Miyasaka, Hideaki Kasano, "Evaluation of deformation-induced transformation and reversion processes of stainless steel by acoustic microscope", Proc. SPIE 3585, Nondestructive Evaluation of Aging Materials and Composites III, (8 February 1999); doi: 10.1117/12.339865; https://doi.org/10.1117/12.339865
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