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Effect of Tungsten on Long-Term Microstructural Evolution and Impression Creep Behavior of 9Cr Reduced Activation Ferritic/Martensitic Steel

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Abstract

The present study describes the changes in the creep properties associated with microstructural evolution during thermal exposures to near service temperatures in indigenously developed reduced activation ferritic-martensitic steels with varying tungsten (1 and 1.4 wt pct W) contents. The creep behavior has been studied employing impression creep (IC) test, and the changes in impression creep behavior with tungsten content have been correlated with the observed microstructures. The results of IC test showed that an increase in 0.4 pct W decreases the creep rate to nearly half the value. Creep strength of 1.4 pct W steel showed an increase in steels aged for short durations which decreased as aging time increased. The microstructural changes include coarsening of precipitates, reduction in dislocation density, changes in microchemistry, and formation of new phases. The formation of various phases and their volume fractions have been predicted using the JMatPro software for the two steels and validated by experimental methods. Detailed transmission electron microscopy analysis shows coarsening of precipitates and formation of a discontinuous network of Laves phase in 1.4 W steel aged for 10,000 hours at 823 K (550 °C) which is in agreement with the JMatPro simulation results.

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Acknowledgments

The authors would like to express their sincere thanks to Dr. T. Jayakumar, Dr. K. Laha, and Dr. M. Vijayalakshmi for their support and Dr. T. Karthikeyan for the EBSD experiment.

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Authors and Affiliations

  1. Metallurgy and Materials Group, Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, 603 102, India

    V. Thomas Paul, V. D. Vijayanand, C. Sudha & S. Saroja

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  1. V. Thomas Paul
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  2. V. D. Vijayanand
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  3. C. Sudha
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  4. S. Saroja
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Correspondence to S. Saroja.

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Manuscript submitted April 8, 2016.

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Thomas Paul, V., Vijayanand, V.D., Sudha, C. et al. Effect of Tungsten on Long-Term Microstructural Evolution and Impression Creep Behavior of 9Cr Reduced Activation Ferritic/Martensitic Steel. Metall Mater Trans A 48, 425–438 (2017). https://doi.org/10.1007/s11661-016-3823-x

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