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TEM Studies of Boron-Modified 17Cr-7Ni Precipitation-Hardenable Stainless Steel via Rapid Solidification Route

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Abstract

Commercial grade 17Cr-7Ni precipitation-hardenable stainless steel has been modified by adding boron in the range 0.45 to 1.8 wt pct and using the chill block melt-spinning technique of rapid solidification (RS). Application of RS has been found to increase the solid solubility of boron and hardness of 17Cr-7Ni precipitation-hardenable stainless steel. The hardness of the boron-modified rapidly solidified alloys has been found to increase up to ~280 pct after isochronal aging to peak hardness. A TEM study has been carried out to understand the aging behavior. The presence of M23(B,C)6 and M2(B,C) borocarbides and epsilon-carbide in the matrix of austenite and ferrite with a change in heat treatment temperature has been observed. A new equation for Creq is also developed which includes the boron factor on ferrite phase stability. The study also emphasizes that aluminum only takes part in ferrite phase stabilization and remains in the solution.

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Acknowledgments

The authors thank Dr. Kantesh Balani, IIT Kanpur, for giving valuable suggestions during the manuscript preparation. The authors also acknowledge Mr. B. Vishwanadh and Mr. K.V. Mani Krishna, BARC, for helping with the TEM.

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Author notes

  1. Ankur Gupta (Graduate Research Assistant)

    Present address: Advanced Materials Processing and Analysis Center, Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, 32816, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, Kanpur, 208016, India

    Ankur Gupta (Graduate Research Assistant)

  2. Department of Metallurgical & Materials Engineering, Malaviya National Institute of Technology, Jaipur, 302017, India

    Ankur Gupta (Graduate Research Assistant) & A. K. Bhargava (Professor)

  3. Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    R. Tewari (Scientist)

  4. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, Mumbai, 400076, India

    A. N. Tiwari (Professor)

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  1. Ankur Gupta
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Correspondence to Ankur Gupta.

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Manuscript submitted June 23, 2012.

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Gupta, A., Bhargava, A.K., Tewari, R. et al. TEM Studies of Boron-Modified 17Cr-7Ni Precipitation-Hardenable Stainless Steel via Rapid Solidification Route. Metall Mater Trans A 44, 4248–4256 (2013). https://doi.org/10.1007/s11661-013-1793-9

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