Fe-20 wt%Cr-25 wt%Ni-Beオーステナイト合金の粒界反応型析出

抄録

Precipitation in Fe-20 wt%Cr-25 wt%Ni-(0.41, 0.50, 0.58) wt%Be austenitic steels has been investigated by microscopy and hardness measurement. Besides the homogeneous precipitation, the cellular precipitation is observed. It is also found that the cellular precipitation increases with increasing Be content.
Effects of small amounts of additional elements on the cellular precipitation have been investigated. Cellular precipitation is markedly suppressed by adding a small amount of Nb or Zr. Recrystallization of cold worked Fe-20 wt%Cr-25 wt%Ni austenitic steels containing a small amount of quaternary additional elements has also been investigated. The results show that the elements which raise the recrystallization temperature of the Fe-20 wt%Cr-25 wt%Ni steel have a tendency to suppress the cellular precipitation in the Fe-20 wt%Cr-25 wt%Ni steels containing 0.41 to 0.58 wt%Be.