Nanocrystallisation of Nickel Free High Nitrogen Austenitic Stainless Steel through Ultrasonic Shot Peening

GIRIJA SHANKAR MAHOBIA; Chandra Shekhar  Kumar; Kausik  Chattopadhyay

doi:10.4028/www.scientific.net/KEM.813.43

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 813Nanocrystallisation of Nickel Free High Nitrogen...

Nanocrystallisation of Nickel Free High Nitrogen Austenitic Stainless Steel through Ultrasonic Shot Peening

Abstract:

Ultrasonic Shot Peening (USP) - a novel route of surface modification was employed on biomedical grade Nickel free high nitrogen stainless steel (18Cr-21Mn-0.65N-balance Fe) to obtain a surface nanostructure without changing its chemical composition and microstructural phase transformation. Hardened steel shots of diameter 2 mm and 3mm were repeatedly impacted on the specimen surface at a constant frequency of 20KHz for 2 and 8 minutes duration. Coarse surface grains of size 36±6µm transformed into nanocrystalline grains of size 13-18 nm. The deformed layer resulted by USP treatment increased with increase in shot diameter and duration of USP. The microstructure was characterized by using optical microscope, SEM, XRD and TEM technique. The hardness and roughness of the treated surface was also found to be strongly dependent on the USP process parameters.

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Periodical:

Key Engineering Materials (Volume 813)

Pages:

43-48

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.813.43

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Online since:

July 2019

Authors:

GIRIJA SHANKAR MAHOBIA*, Chandra Shekhar Kumar, Kausik Chattopadhyay

Keywords:

Nanocrystallisation, Nickel Free High Nitrogen Austenitic Stainless Steel (HNS), Ultrasonic Shot Peening (USP)

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