Enhancement of intergranular corrosion resistance of type 304 stainless steel through a novel surface thermo-mechanical treatment

An experimental study is carried out on a novel surface thermo-mechanical treatment involving conventional shot blasting and laser surface treatment, for enhancing inter-granular corrosion resistance of type 304 stainless steel. The modified surface exhibited fine re-crystallized austenite grains. A...

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Bibliographic Details
Published in:Surface & coatings technology 2013-10, Vol.232, p.920-927
Main Authors: Ganesh, P., Kumar, A. Vinod, Thinaharan, C., Krishna, Nanda Gopala, George, R.P., Parvathavarthini, N., Rai, S.K., Kaul, Rakesh, Mudali, U. Kamachi, Kukreja, L.M.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Corrosion
Corrosion environments
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Cross-disciplinary physics: materials science
rheology
Diffraction
Exact sciences and technology
Intergranular corrosion
Laser surface treatment
Materials science
Metals. Metallurgy
Physics
Sensitization
Shot blasting
Stainless steel 304
Stainless steels
Surface treatments
Thermo-mechanical treatment
Thermomechanical treatment
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Summary:An experimental study is carried out on a novel surface thermo-mechanical treatment involving conventional shot blasting and laser surface treatment, for enhancing inter-granular corrosion resistance of type 304 stainless steel. The modified surface exhibited fine re-crystallized austenite grains. A non-destructive approach of monitoring width of γ(311) diffraction peak through a portable X-ray diffraction was adopted, to determine micro-structural state on the thermo-mechanically treated surface. The results of the study have demonstrated that laser-assisted surface thermo-mechanical treatment of type 304 stainless steel is effective not only for enhancing material's inherent resistance against sensitization and inter-granular corrosion due to its subsequent exposure to susceptible temperature regime but also for reducing inter-granular corrosion susceptibility of pre-sensitized specimens. •A new surface thermo-mechanical treatment (STMT) approach is investigated.•It involved shot blasting followed by laser heating for surface recrystallization.•STMT enhanced intergranular corrosion resistance of 304 stainless steel (SS).•STMT also reduced intergranular corrosion susceptibility of pre-sensitized 304 SS.•Potential: As an in-situ technique for life enhancement of SS components
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.06.124