2002 Volume 43 Issue 2 Pages 155-162
High-purity Fe–18Cr–14Ni/Si, Mn, P, S, C, N alloys and high-purity Fe–18Cr–16Ni/Mo alloys were prepared by a cold crucible method to investigate the intrinsic effects of alloying elements on the tensile properties of Fe–18Cr–(14–16)Ni alloys at room temperature. The results show that C and N interstitials had the greatest solid-solution strengthening effect, followed by the ferrite-forming substitutional elements Mo and Si, while Mn, P and S, had little or no solid-solution strengthening effect. Grain refinement caused a decrease in elongation and an increase in tensile strength and the magnitude was considerable in Fe–18Cr–16Ni–Mo alloys. The addition of Mo to Fe–18Cr–16Ni alloys caused an increase in both the internal stress σ0 and coefficient k in the Hall-Petch relation (σ0.2=σ0+kd−1⁄2; where σ0.2, d, and σ0 and k are 0.2% proof stress, grain diameter, and constants, respectively). The 0.2% proof stress of high-purity Fe–18Cr–16Ni alloys obeyed the equation, 0.2% PS (MPa)=80.9+19.4(Mo)+{0.314+0.048(Mo)}×d−1⁄2, where the parentheses indicate Mo content in at% and d is the average grain size in m.
