Deakin University
Browse

File(s) under permanent embargo

Defining the Post-Machined Sub-surface in Austenitic Stainless Steels

journal contribution
posted on 2023-08-25, 03:02 authored by N Srinivasan, B Sunil Kumar, V Kain, N Birbilis, SS Joshi, PV Sivaprasad, G Chai, A Durgaprasad, S Bhattacharya, I Samajdar
Austenitic stainless steels grades, with differences in chemistry, stacking fault energy, and thermal conductivity, were subjected to vertical milling. Anodic potentiodynamic polarization was able to differentiate (with machining speed/strain rate) between different post-machined sub-surfaces in SS 316L and Alloy A (a Cu containing austenitic stainless steel: Sanicroe 28™), but not in SS 304L. However, such differences (in the post-machined sub-surfaces) were revealed in surface roughness, sub-surface residual stresses and misorientations, and in the relative presence of sub-surface Cr2O3 films. It was shown, quantitatively, that higher machining speed reduced surface roughness and also reduced the effective depths of the affected sub-surface layers. A qualitative explanation on the sub-surface microstructural developments was provided based on the temperature-dependent thermal conductivity values. The results herein represent a mechanistic understanding to rationalize the corrosion performance of widely adopted engineering alloys.

History

Journal

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

49

Pagination

2281-2292

Location

Berlin, Germany

ISSN

1073-5623

eISSN

1543-1940

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

6

Publisher

SPRINGER