Research Papers: Gas Turbines: Manufacturing, Materials, and Metallurgy

Material Selection Issues for a Nozzle Guide Vane Against Service-Induced Failure

[+] Author and Article Information
Xijia Wu

National Research Council Canada,
Ottawa, ON K1A 0R6, Canada
e-mail: Xijia.wu@nrc-cnrc.gc.ca

Zhong Zhang, Leiyong Jiang, Prakash Patnaik

National Research Council Canada,
Ottawa, ON K1A 0R6, Canada

1Corresponding author.

Contributed by the Manufacturing Materials and Metallurgy Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 1, 2016; final manuscript received September 7, 2016; published online January 10, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(5), 052101 (Jan 10, 2017) (6 pages) Paper No: GTP-16-1432; doi: 10.1115/1.4035159 History: Received September 01, 2016; Revised September 07, 2016

Nozzle guide vanes (NGV) of gas turbine engines are the first components to withstand the impingement of hot combustion gas and therefore often suffer thermal fatigue failures in service. A lifting analysis is performed for the NGV of a gas turbine engine using the integrated creep–fatigue theory (ICFT). With the constitutive formulation of inelastic strain in terms of mechanism-strain components such as rate-independent plasticity, dislocation glide-plus-climb, and grain boundary sliding (GBS), the dominant deformation mechanisms at the critical locations are thus identified quantitatively with the corresponding mechanism-strain component. The material selection scenarios are discussed with regards to damage accumulated during take-off and cruise. The interplay of those deformation mechanisms in the failure process is elucidated such that an “optimum” material selection solution may be achieved.

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Fig. 1

Computational domain and mesh: (a) flow and solid mesh and (b) mesh at one middle cross section

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Fig. 2

FEM model: (a) the suction side of the NGV airfoil and (b) the pressure side of the airfoil

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Fig. 3

Temperature distribution in the NGV: (a) the pressure side and (b) the suction side

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Fig. 4

Contours of NGV displacement: before loading (pink) and after (blue)

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Fig. 5

Stress distribution in the NGV (material A)

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Fig. 6

Locations of plastic strain accumulation (material A)

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Fig. 7

Locations of creep strain accumulation (material A)

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Fig. 8

Accumulation of plastic and creep strain and relaxation of von Mises stress during take-off

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Fig. 9

Accumulation of plastic and creep strain and relaxation of von Mises stress during cruise

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Fig. 10

A service-exposed NGV containing a crack

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Fig. 11

Fracture mode of service-exposed NGV (material B)

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Fig. 12

LCF mechanism map for Mar-M 509



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