Effect of various phase fraction of bainite, intercritical ferrite, retained austenite and pearlite on the corrosion behavior of multiphase steels

The work discusses the corrosion behavior of a set of newly developed high strength and highly ductile multi-phase steels consisting of various fractions of bainite, intercritical ferrite, retained austenite and pearlite from the composition 0.67 % C, 1.71 % Si, 0.86 % Mn and 96.69 % Fe (wt.%). The steels were made by various combinations of continuous cooling in the ferrite-pearlite zone followed by austempering. Multiphase interaction and rust constituents uniquely control the corrosion of the steels. At a particular isothermal temperature, initial increase in corrosion rate with increment of continuous cooling time is followed by decrease in corrosion rate once pearlite starts appearing.

Automated summary

The work discusses the corrosion behavior of newly developed high strength and highly ductile multi-phase steels made up of various fractions of different structures, and found that multiphase interaction and rust constituents play a key role in corrosion, with corrosion rate initially increasing with continuous cooling time and then decreasing once pearlite appears.