The effect of porosity on the austenite to ferrite transformation in powder metallurgy steels

► Presence of porosity in samples reduces overall stability of austenite phase. ► Nucleation rate of ferrite increases with increase in porosity in the samples. ► Measurements showed reduction in incubation time with increasing porosity. ► Avrami exponent, n, found to be independent of temperature and pore fraction. ► Avrami constant, b(T), found to be dependent on porosity.