English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

To improve microstructure stability at temperatures up to 700°C and avoid segregation of Nb , we modified the chemical composition of Alloy706. It is known that Alloy706 is strengthened by γ’(Ni3Al) phase and γ’’(Ni3Nb) phase. But these phases are unstable at high temperatures after long-term exposure and transform into Nb rich δ or η phase. The modified alloy (FENIX-700) contains less Nb and more Al than Alloy706, so it is strengthened only by γ’(Ni3Al) phase. Also, we could not find δ or η phase in the FENIX-700 after creep and aging at 700°C. The tensile strengths of the FENIX-700 at temperatures from room temperature to 700°C are almost the same as that of Alloy706. The yield strength of FENIX-700 at room temperature is slightly lower than that of Alloy706, but equivalent to that of Alloy706 at high temperatures. The tensile and yield strengths of FENIX-700 at temperatures from room temperature to 700°C are higher than that of Alloy706 after aging at 700°C. According to 10 4 h class creep tests, the approximate 10 5 h creep strength of FENIX-700 at 700°C is more than 100MPa. In this presentation, we use mechanical testing, TEM observation, a segregation test and thermodynamics calculation results to show the mechanical properties and advantages of FENIX-700 for high temperature steam turbine applications.

Modification of Alloy 706 for High Temperature Steam Turbine Rotor Application