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Impression Creep Behavior of 316LN Stainless Steel

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Abstract

Impression creep tests have been carried out at 923 K on 316LN SS containing 0.07, 0.14, and 0.22 wt.% nitrogen, under different applied stress levels. It was observed that the impression creep depth versus time curves were similar to the creep curves obtained from conventional uniaxial creep tests. The impression creep curves were characterized by a loading strain and primary and secondary creep stages similar to uniaxial creep curves. The tertiary stage observed in uniaxial creep curves was absent. The steady-state impression velocity was found to increase with increasing applied stress. The equivalent steady-state creep rates calculated from impression velocities were found to be in good agreement with the steady-state creep rates obtained from conventional uniaxial creep tests. Equivalence between applied stress and steady-state impression velocity with uniaxial creep stress and steady-state creep rate, respectively, has been established based on the laws of mechanics for time-dependent plasticity. It was found that impression velocity was sensitive to the variation in nitrogen content in the steel; impression velocity decreased with increasing nitrogen content, and the results obtained in this study were in agreement with those obtained from uniaxial creep tests.

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Acknowledgments

The authors thank Mr. N.S. Thampi for the technical support in carrying out the experiments. The support and encouragement received from Dr. T. Jayakumar, Director, the Metallurgy and Materials Group and from Dr. Baldev Raj, Director, the Indira Gandhi Centre for Atomic Research are gratefully acknowledged.

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  1. Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamil Nadu, India

    M. D. Mathew,  Naveena & D. Vijayanand

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  1. M. D. Mathew
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  2. Naveena
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Correspondence to M. D. Mathew.

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Mathew, M.D., Naveena & Vijayanand, D. Impression Creep Behavior of 316LN Stainless Steel. J. of Materi Eng and Perform 22, 492–497 (2013). https://doi.org/10.1007/s11665-012-0290-4

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  • DOI: https://doi.org/10.1007/s11665-012-0290-4

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