Effect of NiCr and NiCrAl coatings on the creep resistance of a Ni alloy |
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Authors: | X.C. Zhang C.J. LiuF.Z. Xuan Z.D. WangS.T. Tu |
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Affiliation: | Key Laboratory of Safety Science of Pressurized System, MOE, East China University of Science and Technology, Shanghai 200237, PR China |
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Abstract: | The effect of plasma sprayed NiCr and NiCrAl coatings on the creep resistance of Nickel alloy 690 at temperature of 1033 K was investigated. Experimental results showed that the coatings had a beneficial effect on the improvement of the creep resistance of substrate. However, there was almost no difference in the creep lives between the NiCr and NiCrAl coated specimens at a given stress level. The relation between the applied stress and time to rupture of the coated specimens can be estimated by using Larson-Miller equation. For the coated specimens tested at low applied stress levels, the product of the minimum creep rate and the time to rupture was a constant value. The θ projection method can be used to accurately characterize the creep behavior of the coated specimens. The variation of the creep strain along with time predicted by using θ projection method agreed well with the experimental results. |
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Keywords: | Creep Coating θ Projection method Minimum creep strain rate |
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