日本金属学会誌

J. Japan Inst. Metals, Vol. 76, No. 9 (2012),
pp. 535-540

In-Situ Observation and Acoustic Emission Analysis for SCC of MgCl2 Droplet in SUS304 Stainless Steel

Mitsuharu Shiwa1, Hiroyuki Masuda1, Hisashi Yamawaki1, Kaita Ito2 and Manabu Enoki2

1National Institute for Materials Science, Tsukuba 305-0047
2Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8685

Abstract:

Acoustic emission and optical video microscope monitoring was proposed to investigate the stress corrosion cracking of work-hardened SUS304 stainless steel caused by a small magnesium-chloride droplet. The crack propagation length could measure clearly under the droplet by VMS. The SCC started at 45-82 ks with pitting. The crack velocity was 3.2-4.7 μm/ks and it propagated almost continuously. AE signals were generated at early stage of SCC testing of 55 ks and 82 ks, after that they were generated discontinuously. With the SEM observations, the detected AE signals were mainly attributed to cracking of the oxidation products and discontinuous crack propagation at the falling-off surface grain.


(Received 2012/4/25)

Keywords:

stress corrosion cracking, droplet, SUS304 stainless steel, acoustic emission, in-situ optical observation


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