抄録
Precipitation in Fe-10 at%Ni-(1.5, 3, 4, 5, 6) at%Al and Fe-10 at%Ni-(1.5, 3, 4, 5) at%Be martensitic steels has been investigated by microscope observations and hardness measurements. Besides homogeneous precipitation, cellular precipitation is observed. It is also observed that cellular precipitation decreased with decreasing Al or Be content and the precipitation in the steels containing 1.5 at%Al or 1.5 at%Be proceeds in a homogeneous mode.
Effects of small amounts of additional elements on the cellular precipitation have been investigated. Cellular precipitation is markedly suppressed by small additions of Nb, Ti or Mo. Recrystallization behaviors of cold worked Fe-10 at%Ni martensitic steels containing small amounts of ternary additional elements have also been investigated. It is shown that the elements which raise the recrystallization temperature of the Fe-10 at%Ni steel have a tendency to suppress the cellular precipitation in the Fe-10 at%Ni martensitic steels containing 3 to 6 at%Al or 3 to 5 at%Be.
