Alloy design of Ni-base superalloys aiming for over 750°C class A-USC steam power plant

Jun Sato, Hironori Kamoshida, Shiny A. Imano, Toshihiro Omori, Kiyohito Ishida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

To reduce CO2 emissions, ongoing research and development on Advanced Ultra Super Critical (A-USC) power generation aims to enhance the efficiency of coal-fired power generation. In an A-USC plant, it is necessary to use higher strength Ni-base superalloys in addition to conventional heat-resistant steel. However, since the manufacturability of existing commercial Ni-base superalloys is not as good as that of heat-resistant steel, development of new materials with excellent manufacturability and high-temperature strength has been underway. 700°C class A-USC materials are the mainstream of current research, and trial production of 10 ton-class forged ingots has been reported. However, there have been no reports on the development of A-USC materials that can be used at higher temperatures. In this report, an alloy design for Ni-base superalloys that can be used at over 750°C is presented and the basic strength properties are reported. The alloy design was based on the Calculation phase diagram (CALPHAD) method to estimate the effect of each alloying element on phase stability. Eliminating Ti, Nb, and Ta, which are commonly alloyed to conventional Ni-base superalloys, is considered to contribute to a better balance between strength and hot-workability. A prototype alloy with a composition of Ni-23Co-18Cr-8W-4Al-0. 1C [mass %] exhibits twice the creep strength of Nimonic263, and the estimated 105h creep resistant temperature for a steam turbine is 780°C.

Original languageEnglish
Title of host publicationAdvances in Materials Technology for Fossil Power Plants - Proceedings from the 6th International Conference
Pages386-392
Number of pages7
Publication statusPublished - 2011 Jun 15
Event6th International Conference on Advances in Materials Technology for Fossil Power Plants - Santa Fe, NM, United States
Duration: 2010 Aug 312010 Sep 3

Publication series

NameAdvances in Materials Technology for Fossil Power Plants - Proceedings from the 6th International Conference

Other

Other6th International Conference on Advances in Materials Technology for Fossil Power Plants
CountryUnited States
CitySanta Fe, NM
Period10/8/3110/9/3

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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