Behavior of AISI 430 ferritic steel in relation to AISI 304 austenitic steel subjected to different lubrication conditions

ABSTRACT

In metallic materials forming process, in general, which includes the cold rolling of stainless steels, deformation is induced by the relative movement between the material and the tool used, resulting in friction forces. However, materials behave differently during plastic deformation. In this study, microsclerometry tests were carried out to investigate the effect of different lubrication conditions on the tribological behavior of AISI 304 and AISI 430 stainless steel samples, previously hardened via cold rolling. The results of the friction coefficient and the depth of penetration of the scratches were analyzed, in addition to the scratch profile being investigated using 3D profilometry. In the microsclerometry tests, no significant differences were observed in the coefficient of friction as a function of the lubrication condition used for both steels. The coefficient of friction of the AISI 430 steel was around 23% higher than that of the AISI 304 steel due to the increase in roughness due to plastic deformation of the AISI 430 steel. The penetration depth was higher for AISI 304 steel due to the transformation of metastable austenite into martensite by deformation. Analysis of the profile of the scratches via profilometry revealed that there was no significant material removal, only displacement from the groove to the edges of the scratch.

Keywords:
Microsclerometry; Deformation; Coefficient of friction; AISI 430; AISI 304