Abstract
The fracture mode of several austenitic stainless steels in stress corrosion cracking in MgCl2 aqueous solution was investigated fractographically by scanning electron microscopy. Effects of alloying elements, testing temperature, anodic and cathodic polarization, and passivator on the fracture mode were determined. With the exception of the alloys containing Mo, transgranular fracture was observed in stress corrosion cracking of austenitic stainless steels in MgCl2 aqueous solution boiling at 143°C. Transgranular fracture was characterized by a fine parallel pleat pattern. This pattern seemed to be traces of dissolution of the metals. Intergranular stress corrosion cracking occurred in Type-316 stainless steel and 16 Cr-15 Ni-2∼4 Mo steels. This type of fracture was also observed in Type-304 stainless steel fractured under the following conditions; testing temperatures lower than 125°C, cathodic polarization, and addition of NaNO3. The transgranular fracture surface was found to be parallel to {111} planes.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
