Modification of Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy for USC Power Plant Application at Temperature above 750°C

Xi Shan Xie; Shuang Qun Zhao; Jian Xin Dong; Gaylord D. Smith; B.A. Baker; Shalesh J. Patel

doi:10.4028/www.scientific.net/MSF.561-565.471

Paper Titles

Oxidation Behaviours of MoSi₂ Single Crystal at the Temperatures of 773K and 1473K
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Plastic Deformations in L1₀-Ordered Single Crystals with their c/a Ratios Less than Unity
p.459

Thermoelectric Properties of Ru₂Si₃-Based Chimney-Ladder Phases
p.463

Hydrogen Permeation Properties of Nb-Based Two-Phase Compounds
p.467

Modification of Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy for USC Power Plant Application at Temperature above 750°C
p.471

Phase Equilibria and Atomic Diffusion in the Ir/CoAl System
p.477

Microstructures and Mechanical Properties of Ti-48Al-2Cr-2Nb-xW
p.481

Improvement of Strength, Weibull Modulus and Damage Tolerance of SiC
p.489

Hydrothermal Synthesis of Bi_1.5ZnNb_1.5O₇ Nanopowders
p.495

HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Modification of Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy...

Modification of Ni-Cr-Co-Mo-Nb-Ti-Al Superalloy for USC Power Plant Application at Temperature above 750°C

Abstract:

A recent developed Ni-Cr-Co-Mo-Nb-Ti-Al type nickel-base superalloy, INCONEL 740, has been selected for the application of USC boilers at the temperature above 750°C. This paper focuses on the structure stability improvement of this alloy. Phase computation by Thermo-Calc has been adopted to study main influencing factors on precipitating phases of the alloy and the results show that the ratio of Al/Ti plays an important role. Four new modified alloys in adjustment of Al and Ti contents and in control of Si level were designed and melted for experimental study. The results indicate that the modified alloys exhibit more stable structure stability at 750, 800 and 850°C long time exposure. The newly developed alloy can be adopted for engineering production and application for USC power plants at temperature above 750°C.

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Materials Science Forum (Volumes 561-565)

Pages:

471-476

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.471

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Online since:

October 2007

Authors:

Xi Shan Xie, Shuang Qun Zhao, Jian Xin Dong, Gaylord D. Smith, B.A. Baker, Shalesh J. Patel

Keywords:

Inconel 740, Modification, Phase Computation, Structure Stability, Superalloy

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