Influence of Ferrite- and Austenite- Former Elements on Solid Solution Hardening in Ferritic Steel and Austenitic Steel

Abstract

The amount of solid solution hardening by some elements was investigated using Fe-25 mass％Cr ferritic steel and Austenitic steels. It was revealed that the hardening amount by Austenite-former elements was considerably larger than that by ferrite-former elements in Ferritic steel. Meanwhile the hardening amount by Ferrite-former elements showed higher value in Austenitic steel, which was a reverse tendency to Ferritic steel. The mechanism was discussed from the point of solubility limit of elements. As a result, the good correlation between the hardening amount and solubility limit was found and the predictive expression of the hardening amount from solubility limit was suggested.

Fig. 7 The relationship between increase of 0.2％ proof stress by solid solution hardening and the inverse of solubility limit, 1/S_L ((a) Ferritic steel, (b) Austenitic steel).