Homogenisation effect on mechanical and pitting behaviour of 2205 Duplex Stainless Steel

Abstract

We investigated the effect of homogenisation on the grain boundary character distribution and its influence on the mechanical behaviour and pitting resistance of an ultrafine grained 2205 duplex stainless steel after cold rolling and annealing. The results revealed that the cold rolling process induced the formation of a strain-induced martensite (SIM). Additionally, the Kurdjumov–Sachs relationship between the martensite laths and the metastable austenite was established through texture analysis. Furthermore, the homogenisation process enhanced the ductility of the steel. An increase in the pitting resistance after homogenisation was attributed to the grain boundary character distribution. This improvement corresponds to the increase in the ∑3 boundaries in the austenite and increase in the ∑17b boundaries fraction in the ferrite.

KEYWORDS:

• duplex stainless steel
• texture
• grain boundary character distribution
• mechanical properties
• corrosion behaviour

Acknowledgements

The authors are grateful to CAPES-PROEX, FAPEMIG, and CNPq for their financial support. Thanks are also expressed to Aperam South America for the samples supplied.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by CNPq [grant number 404303/2016-1]; CAPES-PROEX [grant number 88882.348670/2010-0]; FAPEMIG [grant number APQ-01905-16].