Advances in the development of corrosion and creep resistant nano-yttria dispersed ferritic/martensitic alloys using the rapid solidification processing technique

作者：Verhiest K^*; Mullens S; De Graeve I; De Wispelaere N; Claessens S; De Bremaecker A; Verbeken K

来源：Ceramics International, 2014, 40(9): 14319-14334.

DOI：10.1016/j.ceramint.2014.06.023

• ODS
• Nano-ferritic/martensitic alloys
• Liquid melt
• Wettability
• Colloidal nano-yttria

High-temperature creep and corrosion resistant nano-dispersed ferritic/martensitic (F/M) alloys (such as a T91 steel), or other %26apos;the oxide dispersion strengthened (ODS) steels%26apos;, are under consideration for nuclear applications because of their high-temperature mechanical properties. They consist typically of a high-chromium steel structure dispersed and reinforced by a dispersion of nano-sized rare-earth metal oxides, typically yttrium oxide (Y2O3). %26lt;br%26gt;In this study, the production of ODS based on T91 is examined by adding a 0.3 wt% colloidal Y2O3 dispersion to a T91 steel melt in combination with metallic yttrium (Y-M). The production of the following systems is evaluated: T91-Y2O3, T91-Y-M and T91-Y-M-Y2O3. At first, it was found that when Y-M is added to a steel melt, internal oxidation occurs. Furthermore, it was shown that the T91 system with addition of Y2O3 in combination with rare-earth metal Y-M, creates a homogeneously dispersed ODS T91 material. Moreover, the role of Y-M as a possible surface active element lowering the surface tension at the contact interface is studied. High-temperature contact angle wetting tests between Y2O3 ceramic substrates in contact with an T91 and a [T91+Y-M] melt, combined with auger-electron spectroscopy (AES), indicate the influence of Y-M on the surface activity of Y2O3 in contact with T91. After Y-M addition, the contact angle between T91 and the Y2O3 substrate lowers down to angles below 90 degrees.

• 出版日期2014-11