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Non-Destructive Evaluation of 304 Stainless Steels Using a Scanning Hall-Sensor Microscope: Visualization of Strain-Induced Austenite-Phase Breakdown

Published online by Cambridge University Press:  10 February 2011

A. Oota ,
K. Miyake ,
D. Sugiyama  and
H. Aoki
A. Oota
Affiliation:
Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan, oota@.eee.tut.ac.jp
K. Miyake
Affiliation:
Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan, oota@.eee.tut.ac.jp
D. Sugiyama
Affiliation:
Technical Research and Development Laboratories, Topy Industries Ltd., Akemi-cho, Toyohashi 441-8510, Japan
H. Aoki
Affiliation:
Technical Research and Development Laboratories, Topy Industries Ltd., Akemi-cho, Toyohashi 441-8510, Japan
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Abstract

Using a scanning Hall-sensor microscope with an active area 50pμm × 50μm, we succeeded in visualizing a breakdown of paramagnetic austenite-phase in 304 stainless steels induced by a plastic strain at room temperature, resulting from a transformation to ferromagnetic martensite-phase. Magnetic images of spontaneous magnetic fields on a surface of strained sample show the degree and the place (and/or the extent) of phase breakdown. Furthermore, the images nearly agree with the calculated results for the principal shear stress rather than the principal stress under plastic deformation, indicative of the driving force of this breakdown. The study should open a way for non-destructive evaluation of 304 stainless steels.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 591 , 1999 , 163
Copyright
Copyright © Materials Research Society 2000

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References

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