SB-09-1(051) An Improvement on Creep Characteristics in Carbon Free Martensitic Alloys(Advanced Heat Resistant Steels)

概要

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A new attempt has been demonstrated using carbon free Fe-Ni-Co martensitic alloys strengthened by Laves phase such as Fe_2W or Fe_2Mo to achieve homogeneous creep deformation at high temperatures under low stress levels. Creep behavior of the alloys is found to be completely different from that of the conventional high-Cr ferritic steels. The alloys exhibit gradual change in the creep rate with strain both in the transient and acceleration creep regions, and give a larger strain for the minimum creep rate. In these alloys the creep deformation takes place very homogeneously and no heterogeneous creep deformation is enhanced even at low stress levels. The minimum creep rates of the Fe-Ni-Co alloys at 700℃ are found to be much lower than that of the conventional steel, which is due to fine dispersion strengthening useful even at 700℃ in these alloys. The addition of Pd to the carbon free martensitic alloy has been found to increase creep rupture strength to a great extent at high temperatures over 650℃ as compared with that of SUS 304 steel.
一般社団法人日本機械学会の論文
2001-06-03