Development and evaluation of Fe/Ni dissimilar-weld turbine rotor for advanced USC

Shun Oinuma, Shigekazu Miyashita, Yoshihiro Fujita, Yomei Yoshioka, Takahiro Kubo

Research output: Contribution to conferencePaperpeer-review

Abstract

In order to develop an Fe/Ni dissimilar-weld rotor structure for an Advanced Ultra Super Critical turbine, fundamental studies on the metallurgical properties of Fe/Ni welds are needed. In the work reported in this paper, we studied the microstructure evolution and creep rupture properties of Fe/Ni weld joints with different compositions. Investigation of thermally aged Fe/Ni diffusion couples revealed that Fe-based ferritic steel and Alloy 617 weld joints with a large difference in Cr content showed strong C diffusion at the weld interface. This decreased the creep rupture life of the weld joint, caused by coarsening of a martensitic structure near the interface. Analysis using Fe/Ni diffusion couples and thermodynamic calculations suggested that the driving force of C diffusion is the chemical potential gradient at the interface, and the difference in Cr content between Fe and Ni accelerates the C diffusion.

Original languageEnglish
Pages1341-1351
Number of pages11
Publication statusPublished - 2014 Jan 1
Externally publishedYes
Event7th International Conference on Advances in Materials Technology for Fossil Power Plants - Waikoloa, HI, United States
Duration: 2013 Oct 222013 Oct 25

Other

Other7th International Conference on Advances in Materials Technology for Fossil Power Plants
CountryUnited States
CityWaikoloa, HI
Period13/10/2213/10/25

ASJC Scopus subject areas

  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

Fingerprint Dive into the research topics of 'Development and evaluation of Fe/Ni dissimilar-weld turbine rotor for advanced USC'. Together they form a unique fingerprint.

Cite this