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Creep Damage Evaluation in High-Pressure Rotor Based on Hardness Measurement

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Abstract

A creep life consumption study was conducted in a high-pressure turbine rotor belonging to a 363 MW thermal power plant. The component is manufactured with 30CrMoV412 steel, which is a typical 1CrMoV forged rotor steel, having operated for 112,000 h, under a pressure of 17.6 MPa and temperature of 520 °C. The main objective of this paper is to evaluate the applicability of hardness tests as a tool for structural integrity analysis in the field. Two methods for estimating creep remaining life based on hardness measurements were used. Furthermore, metallographic replicas made during unit shutdown were observed by scanning electron microscopy, in order to detect creep voids and also to corroborate the results for accumulated creep damage obtained based on hardness measurements.

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Abbreviations

k R :

Thermal conductivity of rotor material (W/m·K)

p s :

Average steam pressure (kgf/cm2 or MPa)

r 1C , r 2C :

Internal and external case radii (mm)

r 1R, r 2R :

Inner and outer rotor radii (mm)

r 3R :

Rotor external radius (mm)

t :

Steady-state operating time (h)

t R :

Creep rupture time (h)

\(\bar{t}\) :

Remaining life (h)

C P :

Specific heat at constant pressure of rotor material (J/kg K)

D C :

Creep accumulated damage (%)

E :

Elastic modulus of rotor material (GPa)

G :

Modified Larson-Miller parameter, G = log[T (20 + log t)]

H 0 :

Average hardness value at the manufacturing time (HV)

H t :

Average hardness value at the inspection time (HV)

H t0 :

Average hardness value at the inspection time in a non-stressed region (HV)

H tσ :

Average hardness value at the inspection time in a stressed region (HV)

LMP:

Larson-Miller parameter, LMP = T (20 + log t R)

T :

Absolute temperature (K)

T 2R :

Average rotor outer surface temperature (°C or K)

T s :

Average steam temperature (°C or K)

β:

Thermal expansion coefficient of rotor material (1/K)

σ:

Applied mechanical stress (MPa)

σr :

Radial stress (MPa)

σθ :

Circumferential stress (MPa)

σ z :

Axial stress (MPa)

σeq :

Equivalent von-Mises stress (MPa)

ν:

Poisson’s ratio

References

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Authors and Affiliations

  1. CEPEL, Rio de Janeiro, Brazil

    B. R. Cardoso, C. F. T. Matt & H. C. Furtado

  2. COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

    L. H. de Almeida

Authors
  1. B. R. Cardoso
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  2. C. F. T. Matt
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  3. H. C. Furtado
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  4. L. H. de Almeida
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Corresponding author

Correspondence to H. C. Furtado.

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Cardoso, B.R., Matt, C.F.T., Furtado, H.C. et al. Creep Damage Evaluation in High-Pressure Rotor Based on Hardness Measurement. J. of Materi Eng and Perform 24, 2784–2791 (2015). https://doi.org/10.1007/s11665-015-1555-5

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  • DOI: https://doi.org/10.1007/s11665-015-1555-5

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