• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/029/03/0281-0292

    • Keywords

       

      HSLA steel; microalloying; strain-induced aging; Cu-bearing steel.

    • Abstract

       

      Investigations were carried out on aging of a HSLA-100 steel containing Cu as the major alloying element and Nb, Ti and V as microalloying elements. The aging process after varying amounts of cold deformation was followed by hardness measurements and microstructural changes were studied using light and electron microscopy. Presence of Ti activates the formation of (Nb, Ti)C precipitates and completely suppresses the precipitation of Cu. Even a solution treatment at 1100° C is not sufficient to completely dissolve Nb and Ti in the matrix and undissolved (Nb, Ti)C precipitates were observed in oil quenched state. Strain induced aging at 400°C causes simultaneous coarsening of existing precipitates and nucleation of fresh carbides, which results in multi-stage hardening in this steel. Strong precipitate-dislocation interactions cause retardation in recrystallization of deformation structure leading to retention of high hardness levels even on prolonged aging.

    • Author Affiliations

       

      Sanjay Panwar1 D B Goel2 O P Pandey1 K Satya Prasad3

      1. School of Physics & Materials Science, Thapar Institute of Engineering & Technology, Patiala 147 004, India
      2. Department of Metallurgical & Materials Engineering, Indian Institute of Technology Roorkee, Roorkee 246 667, India
      3. Defence Metallurgical Research Laboratory, Hyderabad 500 058, India
    • Dates

       
  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.