SYMPOSIA PAPER Published: 01 January 1978
STP38091S

Fractographic Observation of Stress-Corrosion Cracking of AISI 304 Stainless Steel in Boiling 42 Percent Magnesium-Chloride Solution

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The fracture surface of AISI 304 stainless steel in stress corrosion cracking (SCC) in boiling 42 percent magnesium-chloride (MgCl2) solution was investigated fractographically by scanning electron microscopy. To determine the orientation of fracture surface, etch pits were formed on fracture surface by the electroetching method in 1 N sulfuric acid (H2SO4) + 100 mg/litre ammonium thiocyanate (NH4SCN) solution. It was made clear from morphology of etch pit that fracture surface in SCC was almost everywhere on the {100} plane, namely, the path of the crack was determined by crystal orientation and direction of stress. In addition, a striation-like pattern was often found by careful observation on the flat surface.

Author Information

Mukai, Y
Osaka University, Osaka, Japan
Watanabe, M
Osaka University, Osaka, Japan
Murata, M
Osaka University, Osaka, Japan
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Details
Developed by Committee: E08
Pages: 164–175
DOI: 10.1520/STP38091S
ISBN-EB: 978-0-8031-5547-3
ISBN-13: 978-0-8031-0359-7