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

Y Mukai; M Watanabe; M Murata

doi:10.1520/STP38091S

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

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

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