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Heat Treatment and Thermo-Mechanical Treatment to Modify Carbide Banding in AISI 440C Steel: A Case Study

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Abstract

In the present case study, simple heat treatment and thermo-mechanical treatment (TMT) are suggested to salvage AISI 440C steel bars with carbide banding. Optical microscopy, scanning electron microscopy, and hardness measurement were employed to characterize the steel before and after treatments. The experimental results indicate that carbide refinement and uniform distribution of carbides can be achieved by TMT. The hardness of the steel after TMT was higher than 58 HRC in hardened (H1050), cryo-treated (C-80), and tempered (T180) conditions. This TMT cycle was implemented to produce one batch of rings free of carbide banding for outer race of ball bearings.

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Acknowledgment

The authors would like to express their sincere gratitude to Dr. K. Sivan Director, VSSC for his kind permission to publish this work.

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Authors and Affiliations

  1. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Trivandrum, 695022, India

    S. Chenna Krishna, K. V. A. Chakravarthi, Abhay Kumar Jha & Bhanu Pant

  2. Materials and Mechanical Entity, Liquid Propulsion Systems Centre, Valiamala, 695011, India

    K. Thomas Tharian

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  1. S. Chenna Krishna
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  2. K. Thomas Tharian
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  3. K. V. A. Chakravarthi
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  4. Abhay Kumar Jha
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Correspondence to S. Chenna Krishna.

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Krishna, S.C., Tharian, K.T., Chakravarthi, K.V.A. et al. Heat Treatment and Thermo-Mechanical Treatment to Modify Carbide Banding in AISI 440C Steel: A Case Study. Metallogr. Microstruct. Anal. 5, 108–115 (2016). https://doi.org/10.1007/s13632-016-0266-0

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