Relationship between sensitization and magnetic characteristics in 304 stainless steel

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Yanagiwara, Hiroki | Murakami, Takeshi | Kikuchi, Hiroaki^*

Affiliations: Faculty of Engineering, Iwate University, Morioka, Iwate, Japan

Correspondence: [*] Corresponding author: Hiroaki Kikuchi, Faculty of Engineering, Iwate University, Morioka, Iwate 020-8551, Japan. Tel.: +81 19 621 6890; Fax: +81 19 621 6890; E-mail:hkiku@iwate-u.ac.jp

Abstract: We investigated the relationship between sensitization and magnetic characteristics of austenitic stainless steel with different composition. The saturation magnetization increased with increasing heat treatment time and the coercivity increases at first and then decreases for the specimens with higher carbon content. The changes in magnetic properties are not remarkable for the specimens with lower carbon content. The area where the chromium carbides formed yields chromium depletion zone and shows ferromagnetic properties. Chromium depletion zone induces martensitic transformation because the martensitic transformation temperature rises. The obtained results indicate that sensitization is detectable using magnetic measurement.

Keywords: Martensitic transformation, paramagnetic, ferromagnetic, nondestructive evaluation (NDE), sensitization, Cr depletion

DOI: 10.3233/JAE-162171

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 3-4, pp. 1075-1080, 2016