NDLI: Characterization of deformation-induced metallurgical change in austenite stainless steel sheet with acoustic microscopy

Content Provider	Springer Nature Link
Author	Kasuga, Yukio Park, Tae Sung Park, Ik Keun Miyasaka, Chiaki
Copyright Year	2012
Abstract	This article reports on the non-destructive evaluation (NDE) of metallurgical changes induced by the deformation processes. In particular, the martensite and reversed austenite states of a meta-stable austenitic stainless steel sheet were evaluated. The sheet was elongated up to 40% at room temperature, and was then brought below room temperature to produce martensite. This was then followed by annealing for reversion. First, martensite content was measured with a Feritscope. Second, the surface acoustic wave (SAW) velocity was measured with a high numerical aperture spherically focused ultrasonic beam with a frequency equal to 600 MHz. The measured SAW velocity values were found to be dependent on the elongation, the ambient temperature during elongation, and the annealing temperature. A useful trend was found in the correlation between the measured SAW velocity and the martensite content as measured with the Feritscope. Second, using a high frequency (i.e., 800 MHz) acoustic imaging technique, the deformed and annealed grain structures were mapped. In comparing the acoustic images with the optical images, the deformed grains shown in the acoustic images were found to be significantly clearer than those shown in the optical images. These studies reveal the importance of NDE, in connection with the forming of stainless steel structures, to map the deformation induced metallurgical changes. Here, unique NDE techniques are seen to be effective in mapping the changes with the use of hypersonic SAW velocity measurements and imaging.
Starting Page	265
Ending Page	271
Page Count	7
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	18
Issue Number	2
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2012-04-27
Publisher Place	Springer
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ultrasonics image analysis microstructure tensile test annealing Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Engineering Thermodynamics, Heat and Mass Transfer Operating Procedures, Materials Treatment Metallic Materials Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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