Dear Dr. Serge Lemika,

to study the hardness data at the domain of Ferrite and Austenite phases, nanoindentation and microhardness studies have been conducted on austenite and ferrite present in the microstructure of hot rolled and heat treated duplex stainless steel (2205 DSS). Nanoindentation data show a hardness value of respectively 7.9 GPa for Ferrite and 8.9 GPa for Austenite. Vickers microhardness experimental data, indicated that there was no significant difference between the hardness value of the austenite phase and the ferrite phase except for the hardness test carried out at 50 gf load giving an average hardness values of 343 HV for Austenite and 311 HV for ferrite. However, it is possible to assume that, the factors responsible for high Nano hardness can also be the same factors for austenite high micro hardness.

For more details, please see the source:

- Datasets on the measurement of mechanical properties of ferrite and austenite constitutive phases using nanoindentation and micro hardness techniques

Ayorinde Tayo Olanipekun, Maledi Nthabiseng, Olusoji Oluremi Ayodele, M.R. Mphahlele, Bob Mpinda Mampuya, Peter Apata Olubambi.

Data in Brief, Volume 27, 104551 (2019).

Best regards, Pierluigi Traverso.

hallo,

pls think about that hardness of a microconstituent/phase is not an absolute figure. hardness of a phase strongly depends on its chemistry (interstitial or substitutional), its nano precipitation inside the phase, its dislocation density, its grain/subgrain/lath size, etc ....

so pls specify your steel grades of interest, as carbon steel, chromium steel, special steel, etc to give you correct support.

for example I have to report 3.5 and 10 GPa for ferrite and austenite in a low alloyed TRIP grade. Due to the fact that austenite is metastable in low alloyed carbon steel... pls consider these facts in provate communicatioj

Hardness is not absolute.

It's related to the steel chemical composition.