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Erosion–Corrosion Behaviour of Nickel and Iron Based Superalloys in Boiler Environment

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Abstract

Erosion–corrosion of engineering materials is encountered in a large variety of engineering applications including thermal power plants. In such environments, boiler steels are widely used, but they often degrade due to erosion–corrosion at temperatures exceeding 500 °C. Superalloys are used at temperatures above 500 °C due to their excellent mechanical properties and creep resistance at high temperature. In the present investigation, the erosion–corrosion performances of nickel- and iron-based superalloys were evaluated in the low temperature primary super heater zone of a thermal power plant. In this zone, the temperature of flue gases was around 540 °C and the samples were exposed to this environment for 10 cycles of 100 h duration. Weight change was measured after each cycle and the erosion–corrosion products were analyzed through SEM/EDAX, XRD and EPMA. All the superalloys showed weight loss, suggesting the contribution of erosion in erosion–corrosion. An interpretation of the erosion–corrosion mechanism is presented.

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Acknowledgments

The authors wish to thank the Mishra Dhatu Nigam Limited, Hyderabad, India for providing the superalloys; Material Science Division (MMD), BARC, Mumbai, for performing the EPMA analysis; IIT, Kharagpur and IUC Indore, India for extending the facility of SEM/EDAX analysis during this work. The authors are highly grateful to S. G. G. S. Super Thermal Power Plant, Ropar, Punjab, India for their kind support and help to carry out the experimentation work in the power plant environment.

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Authors and Affiliations

  1. Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Allahabad, 211 004, India

    S. B. Mishra

  2. Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India

    K. Chandra & S. Prakash

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  1. S. B. Mishra
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  2. K. Chandra
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  3. S. Prakash
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Correspondence to S. B. Mishra.

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Mishra, S.B., Chandra, K. & Prakash, S. Erosion–Corrosion Behaviour of Nickel and Iron Based Superalloys in Boiler Environment. Oxid Met 83, 101–117 (2015). https://doi.org/10.1007/s11085-014-9509-0

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  • DOI: https://doi.org/10.1007/s11085-014-9509-0

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