Fractographic Observation of Stress-Corrosion Cracking of AISI 304 Stainless Steel in Boiling 42 Percent Magnesium-Chloride Solution
- 1 January 1978
- book chapter
- Published by ASTM International
- p. 164-175
- https://doi.org/10.1520/stp38091s
Abstract
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.Keywords
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