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Effect of Long-Term Exposure on Microstructure and Hardness of Aged Haynes 282 Alloy

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Abstract

Nickel-based superalloy, Haynes 282, is a promising material for aero and land-based gas turbine applications and advanced ultra-supercritical (AUSC) steam power plants due to its outstanding combination of high thermal stability, high-temperature strength; excellent fatigue, creep and oxidation resistance; remarkable fabricability and weldability. Despite its several budding attributes, the alloy needs further developmental activities to realize material challenges for AUSC applications. In the present study, an attempt was made to investigate the influence of long-term exposure of this alloy at AUSC power plant operating temperature on microstructure and hardness. The alloy was subjected to two-step aging and followed by long-term exposure at 760 °C up to 2000 h. The alloy was also put through single-step aging for comparison purpose. The microstructural characterization of the alloy reveals major phases γ, γ', M23C6 and M6C in single-step and two-step aging and in long-term exposure conditions without any deleterious phases, viz. μ, η, σ phases. The morphology of γ' precipitate and its volume fraction was evaluated by using electron microscope images. Vickers hardness of the alloy increased from 334 ± 3 HV10 in two-step aged condition to 372 ± 2 HV10 upon exposure to 250 h and dropped to 360 ± 2 HV10 at 500 h and thereafter saturated.

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The data supporting the findings of this study can be available from the corresponding author upon request.

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Acknowledgements

The authors acknowledge Bharat Heavy Electricals Limited (BHEL) (R&D), Hyderabad for providing Haynes 282 alloy for carrying out this work. Authors also thank Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad for their help in FESEM analysis.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal, Warangal, India

    G. Damodhar Naidu & G. V. S. Nageswara Rao

  2. Department of Atomic Energy, Nuclear Fuel Complex, Hyderabad, India

    R. K. Chaube

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Correspondence to G. V. S. Nageswara Rao.

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Damodhar Naidu, G., Nageswara Rao, G.V.S. & Chaube, R.K. Effect of Long-Term Exposure on Microstructure and Hardness of Aged Haynes 282 Alloy. Metallogr. Microstruct. Anal. 12, 965–985 (2023). https://doi.org/10.1007/s13632-023-01009-2

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