Senior researcher, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,
Head of the second laboratory, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,
Research assistant, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,
Director, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,
Pages: 10 Published: Jan 1990
In order to develop potential reduced-activation ferritic steels for fusion reactor structures, phase stability, toughness and creep rupture strength were investigated for Cr-W and Cr-V steels. Primary concern focused on 9% chromium steels because of their superior high temperature strength compared to low chromium steels. The Cr-W steels exhibited a similar precipitation behavior to carbides and intermetallic compound with conventional Cr-Mo steels while the Cr-V steels exhibited a quite different behavior. Creep rupture strength of 9Cr-2 steels increased but their toughness decreased with increasing the tungsten concentration. A martensitic 9Cr-lW steel showed an excellent toughness. On the other hand, both toughness and creep rupture strength of 9Cr-V steels were poor. The minor additions of vanadium, tantalum, and boron to the 9Cr-lW steel significantly increase creep rupture strength without the degradation of its excellent toughness.
ferritic steels, reduced activation, phase stability, bainite, martensite, δ-ferrite, carbides, intermetallic compound, toughness, ductile-brittle transition temperature (DBTT), creep rupture strength
Paper ID: STP24954S