On The SCC Behaviour Of Austenitic Stainless
Steels In Boiling Saturated Magnesium
Chloride Solution
Author(s)
O. M. Alyousif & R. Nishimura
Abstract
The stress corrosion cracking (SCC) of three austenitic stainless steels was
investigated as a function of test temperature and applied stress in boiling
saturated magnesium chloride solutions (MgCl2) using a constant load method.
Both type 304 and type 316 exhibited similar corrosion elongation curves, while
the corrosion elongation curve of type 310 was different. The relationship
between the time to failure and a reciprocal test temperature fell in two straight
lines on a semi-logarithmic scale as well as the relationship between the
steady-state elongation rate and a reciprocal test temperature. These regions were
considered to correspond to a SCC-dominated region or Hydrogen
Embrittlement (HE)-dominated region. The same behaviour was observed for
applied stress dependence for these stainless steels.
The relationship between the time to failure versus steady state elongation
rate on a logarithmic scale became a straight line, whereas the slopes of the line
for the stainless steels were different for each other. It was found that the
linearity of the relationship can be used to predict the time to failure for the
stainless steels in the corrosive environment. The transition time to time to
failure ratio values had a different constant value for each region. From the
results obtained, it may be suggested that the cracking mechanism for type 304
and type 316 was different from that for type 310. This would be explained by
whether or not a formation of martensite takes place.
Keywords: austenitic stainless steels, magnesium chloride solution, steady-state
elongation rate, stress corrosion cracking, hydrogen embrittlement.
Keywords
austenitic stainless steels, magnesium chloride solution, steady-state
elongation rate, stress corrosion cracking, hydrogen embrittlement.
Related Book
Other papers in this volume
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